Updated on 2024/03/29

写真a

 
NEMOTO Yuichi
 
Organization
Academic Assembly Institute of Science and Technology Fundamental Sciences Associate Professor
Faculty of Science Associate Professor
Graduate School of Science and Technology Fundamental Sciences Associate Professor
Title
Associate Professor
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Degree

  • 博士(理学) ( 1998.3   東北大学 )

Research Interests

  • Ultrasound measurements

  • Strongly correlated electron systems

  • Electric quadrupoles

  • Solid state physics

  • Superconductivity

  • Charge orderings

  • Rare-earth compounds

  • Iron-based superconductors

  • Low-temperature physics

  • Vacancy

  • Elastic constants

  • Surface acoustic waves

  • Orbital orderings

  • Rattling

  • Semiconductor

  • Magnetism

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

  • Natural Science / Semiconductors, optical properties of condensed matter and atomic physics

Research History (researchmap)

  • Niigata University   Graduate School of Science and Technology Fundamental Sciences   Associate Professor

    2010.4

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  • Niigata University   Faculty of Science Department of Physics   Associate Professor

    2010.4

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  • Niigata University   Graduate School of Science and Technology Fundamental Sciences   Associate Professor

    2004.4 - 2010.3

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  • Niigata University   Graduate School of Science and Technology   Associate Professor (as old post name)

    2004.2 - 2004.3

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  • Niigata University   Graduate School of Science and Technology   Assistant

    1998.6 - 2004.1

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  • Niigata University Graduate School of Science and Technology Specialized Course Fundamental Sciences   Associate Professor

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Research History

  • Niigata University   Graduate School of Science and Technology Fundamental Sciences   Associate Professor

    2010.4

  • Niigata University   Faculty of Science Department of Physics   Associate Professor

    2010.4 - 2017.3

  • Niigata University   Graduate School of Science and Technology Fundamental Sciences   Associate Professor

    2004.4 - 2010.3

  • Niigata University   Graduate School of Science and Technology   Associate Professor (as old post name)

    2004.2 - 2004.3

  • Niigata University   Graduate School of Science and Technology   Research Assistant

    1998.6 - 2004.1

Qualification acquired

  • Person in Charge of High-pressure Gas Production Security (chemical machinery and frozen machine)

 

Papers

  • Magnetic Bragg peak enhancement under ultrasound injection Reviewed

    Shin-ichi Shamoto, Mitsuhiro Akatsu, Masato Matsuura, Seiko Ohira-Kawamura, Kazuya Harii, Masao Ono, Lieh-Jeng Chang, Takashi U. Ito, Yuichi Nemoto, Jun'ichi Ieda

    Physical Review Research   4 ( 1 )   2022.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    Ultrasound injection effect on a magnetic Bragg peak of yttrium iron garnet has been studied by quasielastic neutron scattering. The magnetic Bragg peak is vastly enhanced with decreasing temperature. The energy width increases proportionally to the square root of the sample temperature increase induced by the ultrasound injection. Based on a liquid model, the estimated effective mass becomes light when magnetic domain walls are removed under a magnetic field. Because the magnetic Bragg peak is enhanced by the lattice vibration, the enhancement is expected to closely relate to the spin-lattice coupling. The sharp drop is observed above 100 K for the longitudinal mode, indicating the degradation of the spin-lattice coupling. It is consistent with the suppression of the spin Seebeck effect when the temperature rises above 100 K, demonstrating the spin-lattice coupling as the degradation mechanism.

    DOI: 10.1103/physrevresearch.4.013245

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevResearch.4.013245/fulltext

  • Multiople Fluctuation of Iron Pnictide Superconductor Ba(Fe_1-x_Co_x_)_2_As_2_ Reviewed

    Haruyasu Sato, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Ryosuke Kurihara, Keisuke Mitsumoto, Yoshiaki Kobayashi, Masatoshi Sato

    Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)   ( 30 )   011052-1 - 0-11052-6   2020.3

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:J. Phys. Soc. Jpn.  

    DOI: 10.7566/JPSCP.30.011052

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  • Critical Slowing Down of Quadrupole and Hexadecapole Orderings in Iron Pnictide Superconductor Reviewed

    Ryosuke Kurihara, Keisuke Mitsumoto, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Yoshiaki Kobayashi, Masatoshi Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   86 ( 6 )   2017.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    Ultrasonic measurements have been carried out to investigate the critical dynamics of structural and superconducting transitions due to degenerate orbital bands in iron pnictide compounds with the formula Ba(Fe1-xCox)(2)As-2. The attenuation coefficient alpha(L[110]) of the longitudinal ultrasonic wave for (C-11 + C-12 + 2C(66))/2 for x = 0.036 reveals the critical slowing down of the relaxation time around the structural transition at T-s = 65K, which is caused by ferro-type ordering of the quadrupole Ox'2-y'2 coupled to the strain e(xy). The attenuation coefficient alpha(66) of the transverse ultrasonic wave for C-66 for x = 0.071 also exhibits the critical slowing down around the superconducting transition at T-SC = 23K, which is caused by ferro-type ordering of the hexadecapole H-z(alpha)(r(i), r(j)) = O-x'y' (r(i))Ox'2-y'2(r(j)) + Ox'2-y'2(r(i))O-x'y' (r(j)) of the bound two-electron state coupled to the rotation.xy. It is proposed that the hexadecapole ordering associated with the superconductivity brings about spontaneous rotation of the macroscopic superconducting state with respect to the host tetragonal lattice.

    DOI: 10.7566/JPSJ.86.064706

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  • Surface acoustic wave diagnosis of vacancy orbital with electric quadrupoles in silicon Reviewed

    T. Goto, K. Mitsumoto, M. Akatsu, S. Baba, K. Okabe, R. Takasu, Y. Nemoto, H. Yamada-Kaneta, Y. Furumura, H. Saito, K. Kashima, Y. Saito

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS 2014 (SCES2014)   592   2015

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IOP PUBLISHING LTD  

    We demonstrate ultrasonic diagnosis of vacancies in boron-doped silicon wafers currently used in device manufacturing. The low-temperature softening of elastic constants measured by surface acoustic waves (SAW) as well as bulk ultrasonic waves is caused by a coupling of elastic strains to electric quadrupoles of the vacancy orbital in silicon wafers. Using interdigital transducers with a comb gap of 2.5 mu m on a piezoelectric ZnO film deposited on the (001) surface of the wafer, we observed the softening of 1.9x10(-4) in relative amount of the elastic constant C-s below 2 K down to 23 mK. Taking account of the strong quadrupole-strain interaction, we deduced a small vacancy concentration 3.1x10(12) cm(-3) in the surface layer of the wafer within a penetration depth 3.5 mu m of the SAW.

    DOI: 10.1088/1742-6596/592/1/012150

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  • Magneto-Elastic Effects in Tb3Ga5O12 Reviewed

    Ute Loew, Sergei Zherlitsyn, Koji Araki, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Uli Zeitler, Bruno Luethi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 4 )   2014.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    We report new results for the elastic constants studied in Faraday and Cotton-Mouton geometry in Tb3Ga5O12 (TGG), a frustrated magnetic substance with strong spin-phonon interaction and remarkable crystal-electric-field (CEF) effects. We analyze the data in the framework of CEF theory taking into account the individual surroundings of the six inequivalent Tb3+-ion positions. This theory describes both, elastic constants in the magnetic field and as a function of temperature. Moreover we present sound-attenuation data for the acoustic Cotton-Mouton effect in TGG.

    DOI: 10.7566/JPSJ.83.044603

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  • Elastic Softening of Surface Acoustic Wave Caused by Vacancy Orbital in Silicon Wafer Reviewed

    Keisuke Mitsumoto, Mitsuhiro Akatsu, Shotaro Baba, Rie Takasu, Yuichi Nemoto, Terutaka Goto, Hiroshi Yamada-Kaneta, Yuji Furumura, Hiroyuki Saito, Kazuhiko Kashima, Yoshihiko Saito

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 3 )   2014.3

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    We have performed surface acoustic wave (SAW) measurements to examine vacancies in a surface layer of a borondoped silicon wafer currently used in semiconductor industry. A SAW with a frequency of f(s) = 517MHz was optimally generated by an interdigital transducer with a comb gap of w = 2: 5 mu m on a piezoelectric ZnO film deposited on the (001) silicon surface. The SAW propagating along the [100] axis with a velocity of v(s) = 4: 967 km/s is in agreement with the Rayleigh wave, which shows an ellipsoidal trajectory motion in the displacement components u(x) and u(z) within a penetration depth of lambda(p) = 3.5 mu m. The elastic constant C-s of the SAW revealed the softening of Delta C-s/C-s = 1.9 x 10(-4) below 2K down to 23 mK. Applied magnetic fields of up to 2 T completely suppress the softening. The quadrupole susceptibilities based on the coupling between the electric quadrupoles O-u, O-v, and O-zx of the vacancy orbital consisting of 8-7 states and the symmetry strains epsilon(u), epsilon(v), and epsilon(zx) associated with the SAWaccount for the softening and its field dependence on C-s. We deduced a low vacancy concentration N = 3.1 x 10(12)/cm(3) in the surface layer within -lambda = 3.5 mu m of the silicon wafer. This result promises an innovative technology for vacancy evaluation in the fabrication of high-density semiconductor devices in industry.

    DOI: 10.7566/JPSJ.83.034702

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  • Role of Hyperfine Coupling in Magnetic and Quadrupolar Ordering of Pr3Pd20Si6 Reviewed

    L. Steinke, K. Mitsumoto, C. F. Miclea, F. Weickert, A. Doenni, M. Akatsu, Y. Nemoto, T. Goto, H. Kitazawa, P. Thalmeier, M. Brando

    PHYSICAL REVIEW LETTERS   111 ( 7 )   2013.8

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    We study the ternary clathrate Pr3Pd20Si6 in specific heat and ac susceptibility measurements on a high-quality single crystal, distinguishing antiferromagnetic and antiferroquadrupolar ordering, as well as a hitherto unknown magnetic low-temperature transition. The specific heat shows the direct involvement of nuclear spin degrees of freedom in the antiferromagnetic ordering, which is well supported by our calculation of the hyperfine level scheme without adjustable parameters. Pr3Pd20Si6 is, therefore, one of the rare materials where the nuclear moments are involved in the formation of the magnetic ground state.

    DOI: 10.1103/PhysRevLett.111.077202

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  • Quadrupole Ordering and Rattling Motion of Clathrate Compound Pr3Pd20Ge6 Reviewed

    Genki Ano, Mitsuhiro Akatsu, Koji Araki, Kazuo Matsuo, Yoshiaki Tachikawa, Keisuke Mitsumoto, Takashi Yamaguchi, Yuichi Nemoto, Terutaka Goto, Naoya Takeda, Andreas Doenni, Hideaki Kitazawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81 ( 3 )   2012.3

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    We have investigated the quadrupole ordering of 4f-electrons and the rattling motion of guest rare-earth ions in the clathrate compound Pr3Pd20Ge6 using ultrasonic measurements. The elastic constants (C-11 - C-12)/2 and C-44 exhibit considerable softening at low temperatures. A minimum of (C-11 - C-12)/2 at T-Q1 = 0.25 K indicates antiferroquadrupole ordering associated with a Gamma(3) doublet of a crystal-field ground state at the 8c site, while a minimum of C-44 at T-Q2 = 60 mK indicates the ferroquadrupole ordering of a Gamma(5) triplet of a crystal-field ground state at the 4a site. The antiferroquadrupole phase depending on magnetic field direction shows a highly anisotropic behavior. The field-induced ordered phase due to the level crossing of the CEF ground state at the 8c site in magnetic fields along the [001] direction has been found. Furthermore, for the elastic constant C-44 and the attenuation coefficient alpha(44) we found a frequency dependence at two different temperatures of 15 and 25 K, which we describe in terms of the Debye-type dispersion with an Arrhenius-type relaxation time tau = tau(0) exp(E/k(B)T) for two different activation energies of E-L = 102 K and E-H = 198 K. These ultrasonic dispersions are caused by the thermally activated rattling motions of guest rare-earth Pr3+ ions at the 4a site of Pr3Pd20Ge6.

    DOI: 10.1143/JPSJ.81.034710

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  • Dissipation in Non-Kramers Doublet of PrMg3 Reviewed

    Koji Araki, Terutaka Goto, Keisuke Mitsumoto, Yuichi Nemoto, Mitsuhiro Akatsu, Hiroyuki S. Suzuki, Hiroshi Tanida, Shigeru Takagi, Shadi Yasin, Sergei Zherlitsyn, Joachim Wosnitza

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81 ( 2 )   2012.2

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    The low-temperature ultrasonic dispersion in the transverse (C-11 - C-12)/2 mode of PrMg3 with the non-Kramers-doublet ground state has been investigated in temperatures down to 20 mK. The dispersion is caused by a thermally activated motions characterized by an Arrhenius-type relaxation time of tau = tau(0) exp(E/k(B)T) with low activation energy, E = 500 mK, and slow attempt time, tau(0) = 0 8.5 x 10(-10) s. The coupling of the electric quadrupoles of the non-Kramers-doublet ground state to transverse lattice vibrations leads to a vibronic ground state with dissipation. The vibronic state in PrMg3 releases the entropy of k(B) ln2 with lowering temperature across the activation energy. A Kondo-like singlet state due to the binding of the non-Kramers doublet to the lattice vibrations appears at low temperatures far below the activation energy.

    DOI: 10.1143/JPSJ.81.023710

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  • Quadrupole Effects of Vacancy Orbital in Boron-Doped Silicon Reviewed

    Shotaro Baba, Terutaka Goto, Yuta Nagai, Mitsuhiro Akatsu, Hajime Watanabe, Keisuke Mitsumoto, Takafumi Ogawa, Yuichi Nemoto, Hiroshi Yamada-Kaneta

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 9 )   2011.9

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    We have investigated low-temperature properties at a longitudinal elastic constant C-L[111] of a boron-doped silicon crystal grown by a floating zone (FZ) method. The softening of C-L[111] depending on magnetic fields indicates that a magnetic charge state V+ of a vacancy orbital accommodating three electrons is stable. Appreciable anisotropy in the softening of C-L[111] at magnetic fields along the [111] and [1 (1) over bar0] axes up to 10 T is described in terms of a quadrupole susceptibility for the vacancy orbital consisting of a Gamma(8) quartet ground state and Gamma(6) doublet excited state due to the spin-orbit interaction.

    DOI: 10.1143/JPSJ.80.094601

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  • Multipole effects of Gamma(3) doublet-Gamma(4) triplet states in PrMg3 Reviewed

    Koji Araki, Yuichi Nemoto, Mitsuhiro Akatsu, Shinya Jumonji, Terutaka Goto, Hiroyuki S. Suzuki, Hiroshi Tanida, Shigeru Takagi

    PHYSICAL REVIEW B   84 ( 4 )   2011.7

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    Elastic properties of cubic PrMg3 with a non-Kramers Gamma(3) doublet ground state have been investigated with ultrasonic measurements. The temperature dependence of the elastic constant (C-11-C-12)/2 in PrMg3 exhibits a characteristic minimum around 28 K and successively shows pronounced softening below 8 K down to 20 mK. The observation is well described by multipole susceptibility considering both an electric quadrupole O-v and electric hexadecapole H-v with Gamma(3g) representation for the crystal field level Gamma(3) ground state and Gamma(4) triplet excited state located at 54 K for PrMg3. The contribution of the hexadecapole in the Gamma(3)-Gamma(4) system to the multipole susceptibility should be emphasized to explain a common feature of the minimum typically observed in (C-11-C-12)/2 of Pr-based compounds PrPb3, PrAg2In, and the present PrMg3, as revealed by systematic ultrasonic measurements.

    DOI: 10.1103/PhysRevB.84.045110

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  • Rattling in Clathrate Compounds of ROs4Sb12 and R3Pd20Ge6 Reviewed

    Yuichi Nemoto, Tatsuya Yanagisawa, Yuri Yasumoto, Haruki Kobayashi, Akio Yamaguchi, Seiji Tsuduku, Terutaka Goto, Naoya Takeda, Akira Ochiai, Hitoshi Sugawara, Hideyuki Sato, Hideaki Kitazawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77   153 - 158   2008.1

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    We have performed ultrasonic experiments on clathrate compounds ROs4Sb12 and R3Pd20Ge6 to explore rattling and tunneling of a guest rattler's motion. We have found frequency dependence of the elastic constants and ultrasonic attenuations, which is called as ultrasonic dispersion, due to thermally activated rattling. At low temperatures, Curie-type elastic softening obeying 1/T with antiferro-type intersite interaction, which corresponds to quantum tunneling, appears and continues even to the lowest 20 mK in LaOs4Sb12 and La3Pd20Ge6. The understanding of the local charge fluctuation, rattling and tunneling, being coupled to conduction electrons in metals is a basic issue in the aspect of electron-phonon interaction in strongly correlated phenomena such as heavy fermion state, superconductivity and multi-channel Kondo screening effect.

    DOI: 10.1143/JPSJS.77SA.153

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  • Ultrasonic dispersion and off-center rattling in heavy fermion superconductor PrOS4Sb12 Reviewed

    Yuichi Nemoto, Takafumi Ueno, Naoya Takeda, Takashi Yamaguchi, Tatsuya Yanagisawa, Terutaka Goto, Hitoshi Sugawara, Hideyuki Sato

    PHYSICA B-CONDENSED MATTER   378-80   184 - 186   2006.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Ultrasonic attenuation measurements have been firstly performed for a large single crystal of PrOs4Sb12 with the dimensions of 5.97 x 0.6 x 0.6 mm(3). Remarkable frequency dependence around 20-40K has been observed in the elastic constant and attenuation coefficient of the longitudinal C-11 mode associated with E-g symmetry strain in part, which results from a thermally activated off-center rattling with E-g symmetry of a Pr ion inside a Sb icosahedron cage. Parameters of a characteristic time tau(0) = 3.1 x 10(-11) s and an activation energy E = 225 K were obtained. This E-g rattling involving a local charge fluctuation inside a Sb cage periodically arranged may couple to the conduction electrons. As a result, the electron-phonon coupling would lead to heavy fermion and its superconductivity in PrOs4Sb12. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2006.01.070

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  • Tunneling and rattling in clathrate crystal Reviewed

    T Goto, Y Nemoto, T Yamaguchi, M Akatsu, T Yanagisawa, O Suzuki, H Kitazawa

    PHYSICAL REVIEW B   70 ( 18 )   2004.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    We present tunneling and rattling motions of an off-center guest atom in a cage referring to a clathrate crystal La3Pd20Ge6. The elastic constant C-44 of La3Pd20Ge6 shows a Debye-type dispersion of around 20 K obeying a relaxation time tau=tau(0) exp(E/k(B)T) with an attempt time of tau(0)=2.0x10(-12) s and an activation energy E=197 K. At low temperatures below 3 K down to 20 mK, the C-44 shows a softening of C-44=C-44(0)(T-T-C(0))/(T-Theta) with T-C(0)=-337.970 mK and Theta=-338.044 mK. These facts are attributed to two different types of off-center motions with Gamma(5) symmetry in the 4a-site cage of La3Pd20Ge6, a thermally activated rattling motion over the potential hill, and a tunneling motion through the potential hill at low temperatures.

    DOI: 10.1103/PhysRevB.70.184126

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  • Quadrupolar effect and rattling motion in the heavy-fermion superconductor PrOs4Sb12 Reviewed

    T Goto, Y Nemoto, K Sakai, T Yamaguchi, M Akatsu, T Yanagisawa, H Hazama, K Onuki, H Sugawara, H Sato

    PHYSICAL REVIEW B   69 ( 18 )   2004.5

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    The elastic properties of a filled skutterudite PrOs4Sb12 with a heavy fermion superconductivity at T-C=1.85 K have been investigated. The elastic softening of (C-11-C-12)/2 and C-44 with lowering temperature down to T-C indicates that the quadrupolar fluctuation due to the CEF state plays a role for the Cooper paring in superconducting phase of PrOs4Sb12. A Debye-type dispersion in the elastic constants around 30 K revealed a thermally activated Gamma(23) rattling due to the off-center Pr-atom motion obeying tau=tau(0) exp(E/k(B)T) with an attempt time tau(0)=8.8x10(-11) s and an activation energy E=168 K. It is remarkable that the charge fluctuation of the off-center motion with Gamma(23) symmetry may mix with the quadrupolar fluctuation and enhance the elastic softening of (C-11-C-12)/2 just above T-C.

    DOI: 10.1103/PhysRevB.69.180511

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  • Ferroquadrupole ordering and Gamma(5) rattling motion in the clathrate compound Ce3Pd20Ge6 Reviewed

    Y Nemoto, T Yamaguchi, T Horino, M Akatsu, T Yanagisawa, T Goto, O Suzuki, A Donni, T Komatsubara

    PHYSICAL REVIEW B   68 ( 18 )   2003.11

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    Lattice effects in a cerium based clathrate compound Ce3Pd20Ge6 with a cubic Cr23C6-type structure have been investigated by ultrasonic and thermal expansion measurements. Elastic softenings of (C-11-C-12)/2 and C-44 proportional to the reciprocal temperature 1/T above T-Q1=1.25 K are well described in terms of the quadrupole susceptibility for the ground state Gamma(8) quartet. A huge softening of 50% in (C-11-C-12)/2 and a spontaneous expansion DeltaL/L=1.9x10(-4) along the [001] direction in particular indicate the ferroquadrupole ordering of O-2(0) below T-Q1. The elastic anomalies associated with the antiferromagnetic ordering at T-N2=0.75 K and the incommensurate antiferromagnetic ordering are also found. Notable frequency dependence of C-44 around 10 K is accounted for by the Debye-type dispersion indicating a Gamma(5) rattling motion of an off-center Ce ion along the [111] direction with eight fractionally occupied positions around the 4a site in a cage. The thermally activated Gamma(5) rattling motion obeying a relaxation time tau=tau(0) exp (E/k(B)T) with an attempt time tau(0)=3.1x10(-11) sec and an activation energy E=70 K dies out with decreasing temperature, and then the off-center tunneling state of Ce ion in the 4a-site cage will appear at low temperatures.

    DOI: 10.1103/PhysRevB.68.184109

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  • Ultrasonic investigations of Ferroquadrupolar Ordering at 8c Site in Ce3Pd20Ge6 Reviewed

    Yuichi Nemoto, Takashi Yamaguchi, Terutaka Goto, Osamu Suzuki, Takenobu Horino, Andreas Donni, Takemi Komatsubara

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   121 - 123   2002.1

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    We have performed low-temperature ultrasonic investigations using a top-loading type dilution refrigerator to examine the detailed H-T phase diagrams below 1 K in Ce3Pd20Ge6. The field dependence of the elastic constant C44 under fields along [0011 and (CH Ci(2))/(2) under fields along [1101 shows the anomaly which is the phase transition point from autiferromagnetic (AFI\4) phase III coexisting ferroquadrupolar (FQ) ordering to pure FQ phase II. Several anomalies corresponding to subphases near 0,5 T. 1,2 T and i.6 T have been observed in both cases, These anomalies are closely related to the weak incommensurate magnetic Bragg peaks below 0.5 K with a propagation vector k [0,0,1-tau] (tau similar to 0.06), observed by the neutron diffraction for Ce3Pd20Ge6. In the series of R3Pd20 compounds, two successive AFM phase transition at Tivi characterized by a propagation vector k(1)=[111] at Sc sites and T-N2 characterized by k(2)=10011 at 4a sites were commonly observed. In Ce3Pd20Ge6, a structural phase transition associated with the (O-2(0-) (or O-2(2-)) type FQ ordering at Sc sites will prevent the AFM ordering at Sc sites preferable along k(1)=.11111.

    DOI: 10.1143/JPSJS.71S.121

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  • Quadrupolar effect in the perovskite manganite La1-xSrxMnO3 Reviewed

    H Hazama, T Goto, Y Nemoto, Y Tomioka, A Asamitsu, Y Tokura

    PHYSICAL REVIEW B   62 ( 22 )   15012 - 15020   2000.12

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    Elastic properties of the perovskite manganite La1-xSrxMnO3 (x=0.12, 0.165, 0.3) with both orbital and charge degrees of freedom have been investigated by means of ultrasonic measurements. Above the structural phase transition point T-s = 290 K for x = 0.12 and T-s= 310 K for x = 0.165, the transverse (C-11- C-12)/2 mode with the elastic strain of E-g symmetry exhibits a pronounced softening, while the C-44 mode with strain of T-2g symmetry shows a monotonous increase in lowering temperature. The softening of (C-11- C-12)/2 is described in terms of the quadrupolar susceptibility for the coupling between the quadrupolar moment, O-2(0)=(2l(z)(2)-l(x)(2) -l(y)(2))/ root3 and O-2(2)=l(2)(2)-l(y)(2), of the dy doublet of the Mn3+ ion and appropriate elastic strain with E-g symmetry. Elastic softenings of (C-11- C-12)/2 and C-44 modes above T-co = 145 K of x= 0.12 are responsible for the symmetry breaking character of the charge ordering, while a round minimum of the bulk modulus CB around T-co = 100 K of x = 0.165 indicates a glass state in charge ordering. The disappearance of the ultrasonic echo signal below T-co=145 K for x=0.12 is ascribed to a considerable sound wave scattering by elastic domains in the triclinic structure.

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  • Elastic soft mode and charge ordering of Yb4As3 Reviewed

    T Goto, Y Nemoto, A Ochiai, T Suzuki

    PHYSICAL REVIEW B   59 ( 1 )   269 - 276   1999.1

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    The elastic constant of C-44 in Yb4As3 relating to the transverse ultrasonic mode shows a pronounced softening around the structural phase transition point at T-c = 292 K associated with the charge ordering of Yb3+ and Yb2+ states. The group theoretical analysis leads to the charge fluctuation mode with Gamma(5) symmetry coupled to the elastic strain epsilon(yz), epsilon(zx), epsilon(xy) of the soft C-44 mode. In a framework of the Landau phenomenological theory for the phase transition, the order parameter Q(yz) = Q(zx) = Q(xy) not equal 0 below T-c gives rise to the linear chain of Yb3+ ions among the body diagonal [111] direction as well as the trigonal distortion of epsilon(yz) = epsilon(zx) = epsilon(xy) not equal 0. Furthermore, this theory explains experimental observations of the elastic softening C-44 = C-44(0)(T-T-c(0))/(T-Theta) above T-c, the structural change from cubic phase of T-d(6) to trigonal phase of C-3 upsilon(6), and the first-order nature of the transition. [S0163-1829(99)00301-X].

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  • Observation of Ferro-Quadrupole Quantum Criticality in Iron Pnictide Superconductor Ba(Fe1−xCox)2As2

    Haruyasu Sato, Mitsuhiro Akatsu, Ryosuke Kurihara, Yoshiaki Kobayashi, Yuichi Nemoto

    Journal of the Physical Society of Japan   2023.12

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    DOI: 10.7566/JPSJ.92.124710

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  • Ultralow-energy magnon anomaly in yttrium iron garnet

    Shin-ichi Shamoto, Yukio Yasui, Masato Matsuura, Mitsuhiro Akatsu, Yoshiaki Kobayashi, Yuichi Nemoto, Jun'ichi Ieda

    Physical Review Research   2 ( 3 )   2020.8

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    Ultralow-lying magnon energy spectrum in yttrium iron garnet (YIG) has been studied by inelastic neutron scattering in an energy range from 10 to 45 mu eV. When a magnetic field of approximately 0.1 T was applied along [111] direction, ultralow-energy magnon anomaly was found at 10 K, suggesting the closure of the Zeeman energy gap. The anomaly was also observed in the temperature dependence of magnetization under a magnetic field along the [111] direction below 30 K. The specific heat capacity confirms the closure of the Zeeman energy gap at the magnetic field direction. All these anomalies strongly support the magnetic crossover below 30 K under the magnetic field along [111], in addition to a precursor anomaly below 150 K.

    DOI: 10.1103/physrevresearch.2.033235

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  • Thermal expansion and magnetostriction of clathrate compound Pr3Pd20Ge6 Reviewed

    K. Matsumoto, Y. Sekiguchi, O. Iwakami, T. Ono, S. Abe, G. Ano, M. Akatsu, K. Mitsumoto, Y. Nemoto, T. Goto, N. Takeda, H. Kitazawa

    Journal of Physics: Conference Series   969 ( 1 )   2018.4

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    In Pr3Pd20Ge6, the Pr ions are located at two different crystallographic sites, 4a and 8c site. Antiferro-quadrupole ordering (AFQ) of the 8c site occurs at 250 mK. Ac susceptibility measurement indicated that antiferromagnetic ordering (AFM) of the 4a site and Hyperfine-enhanced Pr nuclear magnetic ordering of the 8c site occur at 77 and 9 mK, respectively. To clarify the magnetic and quadrupole properties of Pr3Pd20Ge6, thermal expansion and magnetostriction measurements on single crystal sample were carried out along the [001] direction up to 8 T down to 500 μK using a capacitive dilatometer. In zero field, relative length change ΔL/L in [001] direction had a dip at AFQ and abrupt decrease at AFM ordering. From thermal expansion and isothermal magnetostriction measurements, magnetic phase diagram of Pr3Pd20Ge6 along [001] direction was obtained.

    DOI: 10.1088/1742-6596/969/1/012120

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  • Neutron scattering study of yttrium iron garnet Reviewed

    Shin-Ichi Shamoto, Takashi U. Ito, Hiroaki Onishi, Hiroki Yamauchi, Yasuhiro Inamura, Masato Matsuura, Mitsuhiro Akatsu, Katsuaki Kodama, Akiko Nakao, Taketo Moyoshi, Koji Munakata, Takashi Ohhara, Mitsutaka Nakamura, Seiko Ohira-Kawamura, Yuichi Nemoto, Kaoru Shibata

    Physical Review B   97 ( 5 )   2018.2

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    The nuclear and magnetic structure and full magnon dispersions of yttrium iron garnet Y3Fe5O12 have been studied using neutron scattering. The refined nuclear structure is distorted to a trigonal space group of R3̄. The highest-energy dispersion extends up to 86 meV. The observed dispersions are reproduced by a simple model with three nearest-neighbor-exchange integrals between 16a (octahedral) and 24d (tetrahedral) sites, Jaa, Jad, and Jdd, which are estimated to be 0.00±0.05, -2.90±0.07, and -0.35±0.08 meV, respectively. The lowest-energy dispersion below 14 meV exhibits a quadratic dispersion as expected from ferromagnetic magnons. The imaginary part of q-integrated dynamical spin susceptibility χ″(E) exhibits a square-root energy dependence at low energies. The magnon density of state is estimated from χ″(E) obtained on an absolute scale. The value is consistent with the single chirality mode for the magnon branch expected theoretically.

    DOI: 10.1103/PhysRevB.97.054429

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  • Superfluidity of 4He in dense aerogel studied using quartz tuning fork Reviewed

    K Matsumoto, Y Sekiguchi, O Iwakami, T Ono, S Abe, G Ano, M Akatsu, K Mitsumoto, Y Nemoto, T Goto, N Takeda, H Kitazawa

    J. Phys.: Conf. Ser.   969   12019   2018

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  • Magnetic ordering of hyperfine-coupled nuclear and 4f -electron moments in the clathrate compound Pr3Pd20Ge6.

    O. Iwakami, Y. Namisashi, S. Abe, K. Matsumoto, G. Ano, M. Akatsu, K. Mitsumoto, Y. Nemoto, N. Takeda, T. Goto, H. Kitazawa

    PHYSICAL REVIEW B   90 ( 10 )   2014.9

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    Complex ac susceptibility, chi = chi' - i chi '', measurements of the clathrate compound Pr3Pd20Ge6 were performed in static fields up to 10 mT for H parallel to [001] and at temperatures down to 500 mu K. Praseodymium (Pr) nuclear magnetic moments at the 8c site, where quadrupole moments of 4f electrons order at T-Q1 = 250 mK, were found to order antiferromagnetically at 9 mK, as shown by a peak in chi' and a substantial increase in thermal relaxation time. The large enhancement factor (1 + K-8c) obtained by calculation of the hyperfine-enhanced nuclear susceptibility of Pr at the 8c site accounts for the high transition temperature of Pr nuclear magnetic moments and the large chi' below 30 mK. From analysis of the crystalline electric field and the mean-field approximation, we conclude that a chi peak at 77 mK can be ascribed to an antiferromagnetic ordering of magnetic moments of 4f electrons at the 4a site. We found that nuclear and f-electron moments order separately on two sublattices in this compound. The temperature and magnetic field dependence of chi' and chi '' between 30 and 60 mK are discussed in terms of dissipation phenomena.

    DOI: 10.1103/PhysRevB.90.100402

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  • Absolute value determination of vacancy concentration in silicon crystals using low-temperature ultrasonic measurements

    H. Yamada-Kaneta, K. Okabe, M. Akatsu, S. Baba, K. Mitsumoto, Y. Nemoto, T. Goto, H. Saito, K. Kashima, Y. Saito

    ECS Transactions   64 ( 11 )   13 - 18   2014

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    For the samples taken from the void region of the CZ silicon crystal grown with the same solidification condition and different thermal histories after the solidification, we measure the magnitude S of the elastic softening which is proportional to the concentration of the single vacancies [V], For these samples, we also measure the size distribution of the void density by using the infrared lightscattering tomography, to evaluate the concentration [Vc] of the vacancies consumed for the void formation. From these two experiments, we find a sum rale [Vc] + a S= C, where C depends only on the solidification condition and is independent of the thermal history after the solidification. This enables us to find the conservation rale of the vacancies [Vc] + [V] = C. The value of the proportionality constant a in the relation [V] = a S is determined. Demonstration of determining the absolute values of [V] from the measured S is given. An estimate is made for the value of the quadrupole-strain coupling constant.

    DOI: 10.1149/06411.0013ecst

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  • Strong Quadrupole-Strain Interaction of Vacancy Orbital in Boron-Doped Czochralski Silicon Reviewed

    Kazuki Okabe, Mitsuhiro Akatsu, Shotaro Baba, Keisuke Mitsumoto, Yuichi Nemoto, Hiroshi Yamada-Kaneta, Terutaka Goto, Hiroyuki Saito, Kazuhiko Kashima, Yoshihiko Saito

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   82 ( 12 )   2013.12

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    We have carried out ultrasonic measurements of a boron-doped silicon ingot grown by the Czochralski method in order to determine the quadrupole-strain interaction constant of a vacancy orbital. The low-temperature softening of the elastic constant C-44 shows a remarkable variation depending on positions of the ingot, which reflects the distribution of vacancy concentration N in the ingot. An infrared laser scattering tomograph was employed to measure the density and size of voids in the silicon wafers by determining the vacancy concentration N-cons consumed in void formation. Using a combination of laser scattering tomography and low-temperature softening, we have found a sum rule in which the initially created vacancy concentration N-total corresponds to the sum of the residual vacancy concentration N and the consumed vacancy concentration N-cons as N-total N + N-cons. Taking account of the sum rule, we deduce the interaction constant g(Gamma 5) = (2.8 +/- 0.2) x 10(5) K for the quadrupole-strain interaction H-QS = -g(Gamma 5)O(zx)epsilon(zx) of the vacancy orbital. The huge deformation energy of 1.6 x 10(5) K per vacancy with the Gamma(8) ground state for unit strain epsilon(zx) = 1 verified the strong electron-lattice interaction of the vacancy orbital. Employing the one-to-one correspondence between the softening of Delta C-44/C-44 = 1.0 x 10(-4) down to 30 mK and the vacancy concentration of N = 1.5 x 10(13) cm(-3), we can determine the vacancy concentration by low-temperature ultrasonic measurements. The present work surely puts forward a novel semiconductor technology based on low-temperature ultrasonic measurements for evaluating vacancy concentration in silicon wafers.

    DOI: 10.7566/JPSJ.82.124604

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  • Low-temperature softening due to vacancy orbital with Λ8 quartet ground state in boron-doped floating zone silicon Reviewed

    Shotaro Baba, Mitsuhiro Akatsu, Keisuke Mitsumoto, Satoru Komatsu, Kunihiko Horie, Yuichi Nemoto, Hiroshi Yamada-Kaneta, Terutaka Goto

    Journal of the Physical Society of Japan   82 ( 8 )   2013.8

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    We have carried out low-temperature ultrasonic measurements using shear-mode ultrasound to clarify the quantum state of a vacancy orbital in boron-doped silicon grown by the floating zone (FZ) method. The elastic constants (C11-C12)=2 and C44 of the transverse mode exhibit considerable softening below 2 and 5K down to the base temperature of 30 mK, respectively. The elastic constant C44 measured by the three ultrasonic modes (kx
    uy), (kz
    ux), and (kx
    uz) shows the different magnetic field dependences among the configurations under applied magnetic fields along the z-axis. The elastic softening and the magnetic field dependence of the elastic constants are accounted for by the quadrupole susceptibility based on the energy level scheme of the vacancy orbital with a λ8 quartet ground state and λ7 doublet excited state located at an energy of 1K. The difference in C44 between the two ultrasonic modes (kz
    ux) and (kx
    uz) at fields along the z-axis indicates that the λ8 quartet ground state is slightly split by local strain in the silicon sample. The quantum state of the vacancy orbital is expected to be sensitive to strain because of the extremely large quadrupole-strain coupling energy of gλ ≈ 105 K due to the extensively spreading orbital radius of r ≈ 1 nm. The differences in variation of the low-temperature softening and magnetic field dependence among eight samples cut out from different locations of the present boron-doped FZ silicon ingot evidence the inhomogeneous distribution of the vacancy concentration. © 2013 The Physical Society of Japan.

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  • Quadrupole effects in tetragonal crystals PrCu2Si2 and DyCu2Si2 Reviewed

    Keisuke Mitsumoto, Saori Goto, Yuichi Nemoto, Mitsuhiro Akatsu, Terutaka Goto, Nguyen D. Dung, Tatsuma D. Matsuda, Yoshinori Haga, Tetsuya Takeuchi, Kiyohiro Sugiyama, Rikio Settai, Yoshichika Onuki

    JOURNAL OF PHYSICS-CONDENSED MATTER   25 ( 29 )   2013.7

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    We have investigated quadrupole effects in tetragonal crystals of PrCu2Si2 and DyCu2Si2 by means of low-temperature ultrasonic measurements. The elastic constant C-44 of PrCu2Si2 exhibits pronounced softening below 70 K down to a Neel temperature T-N = 20 K, which is described in terms of a quadrupole susceptibility for a Gamma(5) doublet ground state and a Gamma(3) singlet first excited state located at 15.6 K in the crystalline electric field scheme. The C-44 and C-66 of DyCu2Si2 also show softening below 70 K down to T-N1 = 9.7 K. A low-lying pseudo-sextet state consisting of three Kramers doublets of Gamma(6) circle plus 2 Gamma(7) brings about softening of C-44 and C-66 in DyCu2Si2.

    DOI: 10.1088/0953-8984/25/29/296002

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  • Antiferroquadrupolar ordering and magnetic-field-induced phase transition in the cage compound PrRh2Zn20 Reviewed

    Isao Ishii, Hitoshi Muneshige, Shuhei Kamikawa, Takahiro K. Fujita, Takahiro Onimaru, Naohiro Nagasawa, Toshiro Takabatake, Takashi Suzuki, Genki Ano, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    PHYSICAL REVIEW B   87 ( 20 )   2013.5

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    To investigate the origin of a phase transition at T-Q = 0.06 K simultaneously occurring with a superconducting transition in a cage compound PrRh2Zn20, we carried out ultrasonic measurements on a single-crystalline sample. The transverse modulus (C-11 - C-12)/2 is intimately coupled to the non-Kramers ground doublet Gamma(3), and elastic softening is observed at low temperatures. Below T-Q, the softening stops, suggesting the disappearance of quadrupole degrees of freedom. We clarified the negative quadrupole-quadrupole coupling constant and reentrant behavior of T-Q(H) in a magnetic field H. These results reveal that the phase transition at T-Q is antiferroquadrupolar ordering. The anisotropic magnetic field-temperature phase diagram is determined for H parallel to [100], [110], and [111]. A magnetic-field-induced phase transition is newly found at high fields in all three field directions. We also observed ultrasonic dispersion at around 50 K owing to the rattling motion of Zn atoms at the 16c site, and pointed out the strong electron-phonon coupling in PrRh2Zn20.

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  • Coexistence of Ising and XY Spin Systems on a Single Tb Atom in TbCoGa5 Reviewed

    Naoyuki Sanada, Yuta Amou, Ryuta Watanuki, Kazuya Suzuki, Isao Yamamoto, Hiroyuki Mitamura, Toshiro Sakakibara, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   82 ( 4 )   2013.4

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    The tetragonal compound TbCoGa5 exhibits two successive magnetic transitions at T-N1 = 36.2 and T-N2 = 5.4 K. The results of the measurement of the magnetic susceptibility and specific heat indicate that the c- and ab-components of the magnetic moments of Tb3+ show independent antiferromagnetic orderings at T-N1 and T-N2, respectively. In this work, we have investigated the physical properties of TbCoGa5 in a magnetic field. Single crystals of TbCoGa5 were grown and their specific heat, electrical resistivity, magnetization and elastic constant were measured. The magnetic exchange interactions in TbCoGa5 are discussed referring to the result of the magnetization process. Additionally, the present and previous results are summarized in a magnetic phase diagram. The magnetic phase diagram indicates that the behavior of T-N1 in a changing magnetic field is similar to that of an Ising spin system, and the behavior of T-N2 is similar to that of an XY spin system. Thus, we conclude that Ising and XY spin systems coexist on a single Tb atom in TbCoGa5.

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  • Magnetic phase diagram of clathrate compound Ce3Pd20Si6 with quadrupolar ordering

    H. Ono, T. Nakano, N. Takeda, G. Ano, M. Akatsu, Y. Nemoto, T. Goto, A. Doenni, H. Kitazawa

    JOURNAL OF PHYSICS-CONDENSED MATTER   25 ( 12 )   2013.3

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    We present results of specific heat measurements on a Ce3Pd20Si6 single crystal and construct the magnetic phase diagram for the three cubic principal directions [100], [110] and [111]. The highly anisotropic phase diagram is discussed and can be qualitatively explained by the Zeeman splitting at the 8c-site. For B parallel to [100], the present study found two different quadrupolar ordered phases, which meet the paramagnetic phase at a tri-critical point and establish the new phase boundaries.

    DOI: 10.1088/0953-8984/25/12/126003

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  • Specific heat of Ce3Pd20Si6 single crystal in magnetic fields

    H. Ono, T. Nakano, N. Takeda, G. Ano, M. Akatsu, Y. Nemoto, T. Goto, H. Kitazawa

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011)   391   2012

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    We report the specific heat measurement of single crystalline Ce3Pd20Si6 and the resultant magnetic phase diagram for the direction of B//[100]. In zero field, we confirmed two successive phase transitions at T = 0.24 K and 0.4 K. The magnetic phase diagram clearly shows a phase boundary of paramagnetic phase I, quadrupole ordered phase II and II'.

    DOI: 10.1088/1742-6596/391/1/012054

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  • Effect of Nitrogen Doping on Vacancy State in Silicon Crystals Observed by Low-Temperature Ultrasonic Measurements Reviewed

    Hiroshi Yamada-Kaneta, Satoru Komatsu, Shotaro Baba, Yuta Nagai, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    DEFECTS-RECOGNITION, IMAGING AND PHYSICS IN SEMICONDUCTORS XIV   725   217 - +   2012

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    For the boron-doped FZ silicon crystals grown with and without nitrogen-doping (N-doping), we measured the temperature dependence of the elastic constant in low-temperature region, to examine whether the N-doping suppresses the elastic softening due to the gap-states of the isolated single vacancy. We have found that the elastic softening observed for the N-doping-free crystals is not observed for the N-doped ones, suggesting that the gap-states of the vacancies causing the elastic softening are destroyed by the N-doping. This is consistent with the model of Abe [T. Abe, J. Crystal Growth, 327 (2011) 1] in which the nitrogen molecule (N2) occupies the vacancy to destroy its original gap-states. We have further observed that the N-doped silicon, which shows no softening in its as-grown state, exhibits the softening after the annealing at 1000 degrees C for 1 min. This suggests that during the annealing the N2 molecule is thermally activated to jump off the lattice site leaving the vacancy.

    DOI: 10.4028/www.scientific.net/MSF.725.217

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  • Antiferro-Quadrupolar Ordering at the Lowest Temperature and Anisotropic Magnetic Field-Temperature Phase Diagram in the Cage Compound PrIr2Zn20 Reviewed

    Isao Ishii, Hitoshi Muneshige, Yasuhiko Suetomi, Takahiro K. Fujita, Takahiro Onimaru, Keisuke T. Matsumoto, Toshiro Takabatake, Koji Araki, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Takashi Suzuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 9 )   2011.9

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    The cage compound PrIr2Zn20 with the non-Kramers doublet ground state shows a phase transition at T-Q similar to 0.11 K. To investigate the origin of the phase transition, we have carried out ultrasonic measurements on single-crystalline samples. From the disappearance of electric quadrupole degrees of freedom at T-Q and the negative sign of a quadrupole-quadrupole coupling constant, we clarified that the phase transition is antiferro-quadrupolar ordering at the lowest temperature ever measured. We also found anisotropic magnetic field H dependence and the re-entrant behavior of T-Q(H) from the measurements in H parallel to the [100], [110], and [111] axes. The quadrupole Kondo effect interrupts the long-range quadrupole interaction at very low temperatures and thus lowers T-Q. We first reported the rattling motion of Zn atoms at the 16c site in the RT2Zn20 system.

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  • Quadrupole Effects of Layered Iron Pnictide Superconductor Ba(Fe0.9Co0.1)(2)As-2 Reviewed

    Terutaka Goto, Ryosuke Kurihara, Koji Araki, Keisuke Mitsumoto, Mitsuhiro Akatsu, Yuichi Nemoto, Shunichi Tatematsu, Masatoshi Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 7 )   2011.7

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    Elastic constant measurements on iron pnictide Ba(Fe0.9Co0.1)(2)As-2 with an optimal superconducting transition temperature of T-SC = 23 K have been performed by the ultrasonic pulse echo method. The shear elastic constant of C-66 associated with elastic strain epsilon(xy) reveals considerable softening of 21% below 300 K down to T-SC and becomes increasing in the superconducting phase below T-SC, while other shear elastic constants of (C-11 -C-12)/2 and C-44 show no sign of softening below 80 K down to 4.2 K. The electric quadrupole O-v' existing in the degenerate d(y'z) and d(zx') bands participates in the superconductivity of the present iron pnictide system.

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  • Ultrasonic Measurements on the Cage-Structured Clathrate Compound U3Pd20Si6 Reviewed

    Yanagisawa, Tatsuya, Tateiwa, Naoyuki, Mayama, Taichi, Saito, Hitoshi, Hidaka, Hiroyuki, Amitsuka, Hiroshi, Haga, Yoshinori, Nemoto, Yuichi, Goto, Terutaka

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80   2011.7

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    Ultrasonic measurements of U3Pd20Si6 were performed in order to investigate elastic properties of the cage-structured compound U3Pd20Si6 and also examine a presence of ultrasonic dispersion (UD) due to off-center rattling, which has been observed in the elastic constant C-44 of similar systems R3Pd20Ge6 (R = La - Nd). At temperatures over antiferromagnetic ordering at T-N = 19 K, neither an up-turn anomaly nor frequency dependence of the elastic constants, regarding the UD, was found. On the other hand, the elastic constant C-44 shows pronounced softening due to crystalline electric field effect of U4+ ion's Gamma(5) triplet ground state for both 4a and 8c sites. Below T-N, precipitous elastic softening accompanied by a sudden depression of ultrasonic echo was observed in each ultrasonic mode. A drastic change of Delta C-44/C-44 similar to 30% at T-N, in particular, implies a strong magneto-elastic coupling of 5f-electrons or a possible contribution of a ferroquadrupole interaction to the antiferromagnetism in U3Pd20Si6.

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  • Elastic properties of TbCoGa5 under magnetic field Reviewed

    Naoyuki Sanada, Ryuta Watanuki, Kazuya Suzuki, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80   2011.7

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    The elastic properties of TbCoGa5 single crystal were investigated by the measurement of the elastic constants under magnetic fields. The results of the measurement are consistent with successive component-separated magnetic orderings in TbCoGa5. The elastic properties in high magnetic fields indicate that the spin system is strongly affected by the quadrupole moment system in TbCoGa5. Such a mutual influence assumes an important role in the occurrence of the successive component-separated magnetic transitions.

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  • Crystal Field Level Diagrams at the Pr Sites (8c) and (4a) in the Clathrate Compound Pr3Pd20Si6 Reviewed

    Andreas Doenni, Hideaki Kitazawa, Thierry Straessle, Lukas Keller, Masaaki Matsuda, Kazuhisa Kakurai, Genki Ano, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 4 )   2011.4

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    Inelastic neutron scattering has been employed to determine the complete crystal field (CF) level diagrams at the Pr sites (8c) and (4a) in the clathrate compound Pr3Pd20Si6 with cubic Cr23C6-type crystal structure. The splitting of the H-3(4) multiplet of Pr3+ was found to be Gamma(3) -> Gamma(5) (1.44 meV) -> Gamma(4) (4.46 meV) -> Gamma(1) (10.7 meV) at the (8c) site and Gamma(5) -> Gamma(3) (0.70 meV) -> Gamma(4) (10.8 meV) -> Gamma(1) (24.8 meV) at the (4a) site. We present additional measurements of the specific heat down to 2K and single-crystal high-field magnetization up to 28 T, and show that a calculation with no adjustable parameter based on our CF parameters can quantitatively reproduce the magnetic part of the specific heat and the magnetization curves along three cubic high-symmetry directions. We extrapolate the CF parameters obtained for Pr3Pd20Si6 to those of the isostructural compounds Ce3Pd20Si6, Nd3Pd20Si6 and Er3Pd20Si6, and compare the results with inelastic neutron scattering experiments reported in literature. For the (8c) site, the experimentally determined CF level diagrams are consistent and in good agreement with the extrapolation. In contrast, for the (4a) site, the few available experimental results are inconsistent and in poor agreement with the extrapolation. The extrapolation says that in Ce3Pd20Si6 the CF ground-state at both Ce sites (8c) and (4a) is the Gamma(8) quartet.

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  • Magnetic-Field-Independent Ultrasonic Dispersions in the Magnetically Robust Heavy Fermion System SmOs4Sb12 Reviewed

    Yanagisawa, Tatsuya, Ikeda, Yoichi, Saito, Hitoshi, Hidaka, Hiroyuki, Amitsuka, Hiroshi, Araki, Koji, Akatsu, Mitsuhiro, Nemoto, Yuichi, Goto, Terutaka, Ho, Pei-Chun, Baumbach, Ryan E., Maple, M. Brian

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 4 )   2011.4

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    Elastic properties of the filled skutterudite compound SmOs4Sb12 have been investigated by ultrasonic measurements. The elastic constant C-11(omega) shows two ultrasonic dispersions at similar to 15 and similar to 53K for frequencies omega between 33 and 316 MHz, which follow a Debye-type formula with Arrhenius-type temperature-dependent relaxation times and remain unchanged even with applied magnetic fields up to 10 T. The corresponding activation energies were estimated to be E-2 = 105K and E-1 = 409 K, respectively. The latter, E-1, is the highest value reported thus far in the Sb-based filled skutterudites. The presence of magnetically robust ultrasonic dispersions in SmOs4Sb12 implies a possibility that an emergence of a magnetically insensitive heavy fermion state in this system is associated with a novel local charge degree of freedom, which causes the ultrasonic dispersion.

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  • Quadrupole Ordering and Rattling in Clathrate Compound Pr3Pd20Ge6

    G. Anol, K. Matsuo, K. Araki, Y. Tachikawa, K. Mitsumoto, M. Akatsu, Y. Nemoto, T. Goto, N. Takeda, A. Kikkawa, A. Doenni, H. Kitazawa

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010)   273   2011

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    We have studied quadrupole ordering and rattling in clathrate compound Pr3Pd20Ge6 using ultrasonic measurements. The softening were observed in temperature dependence of elastic constants C-11, (C-11 - C-12)/2 and C-44. The C-11 and (C-11 - C-12)/2 show minimums at 250 mK indicating a transition point to an antiferroquadrupole ordered phase due to a F3 doublet ground state at 8c site. Furthermore, the C-11, (C-11 - C-12)/2 and C-44 exhibit discontinuitive anomalies at 60 mK revealing a ferroquadrupole ordering due to a F-5 triplet ground state at 4a site. Two distinctive ultrasonic dispersions caused by thermally activated F-5-type rattling were observed in C-44 around 15 K and 25 K.

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  • Low-Temperature Elastic Properties of Non-Kramers Doublet Compound PrMg(3)

    K. Araki, K. Mitsumoto, M. Akatsu, Y. Nemoto, T. Goto, H. S. Suzuki, H. Tanida, S. Takagi, S. Yasin, S. Zherlitsyn, J. Wosnitza

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010)   273   2011

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    We have investigated low-temperature elastic properties of PrMg(3) with a non-Kramers Gamma(3) doublet ground state by using ultrasonic measurements under high field up to 18 T down to 20 mK. A softening of the elastic constant (C(11)-C(12))/2 has been observed below 8 K due to the non-magnetic Gamma(3) doublet possessing electric quadrupole O(u) and O(v) with Gamma(3) symmetry and magnetic octupole T(xyz) with Gamma(2). This result appreciably is deviated from a theoretical fitting of the quadrupole susceptibility based on the crystal-electric-field levels below 800 mK. Furthermore, the (C(11)-C(12))/2 shows strange magnetic dependence up to 18 T below 1.7 K, which are inconsistent with the theoretical results.

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  • Magnetic and Thermal Properties of Cubic Single-Crystal PrCu4Ag Reviewed

    Shuai Zhang, Yosikazu Isikawa, Takashi Tayama, Tomohiko Kuwai, Toshio Mizushima, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   79 ( 11 )   2010.11

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    We succeeded in synthesizing a new cubic intermetallic compound PrCu4Ag in a fcc structure. Measurements of X-ray diffraction, magnetic susceptibility, magnetization, specific heat, electrical resistivity, thermal expansion, and elastic constants have been performed on single crystals of PrCu4Ag. A maximum value of chi(T) with a corresponding peak in C(T) suggests that an antiferromagnetic phase transition occurs at T-N = 2.4 K, where a sudden decrease in rho(4f)(T) and a sharp peak in the thermal expansion coefficient alpha(T) were observed. Characteristic Curie-type softening was observed in the temperature dependence of the transverse mode for (C-11 - C-12)/2 and C-44 from 70 K down to T-N, which implies that the crystalline electric field (CEF) ground state is the magnetic triplet Gamma(5). The anisotropic properties in M(T, H) and C(T, H) are studied when the external magnetic field is applied in the < 100 >, < 110 >, and < 111 > directions. Another anomaly observed at approximately 10 K in chi(T) is considered to be related to possible disorder behavior. The low-T behavior and the possibility of quadrupole fluctuation are discussed with respect to the CEF effect. All the experimental results in the present study are summarized in a magnetic phase diagram.

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  • Low Temperature Magnetic Properties of Ce3Pd20Si6 Reviewed

    Hiroyuki Mitamura, Takashi Tayama, Toshiro Sakakibara, Seiji Tsuduku, Genki Ano, Isao Ishii, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Akiko Kikkawa, Hideaki Kitazawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   79 ( 7 )   2010.7

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    Magnetization of a single crystalline Ce3Pd20Si6 was measured at low temperatures down to 90 mK in fields up to 11 T for the three principal directions [100], [110], and [111]. For all directions, two transitions were observed in the temperature variation of the magnetization M(T) at 0.2 T; a broad peak at 0.28 K associated with a phase-III transition, and an upward bending at similar to 0.5 K due to a phase-II ordering from the paramagnetic state (phase-I). The latter critical temperature TI-II is found to be strongly enhanced in magnetic fields B, depending on the field direction, and TI-II(B) becomes highly anisotropic. These results suggest that phase-II is an antiferroquadrupole state originated from a Gamma(8) ground state. By contrast, no appreciable anisotropy is found in the phase-III state. At 90 mK, phase-III collapses by applying a field of similar to 0.63 T for all directions. Above this field, the magnetization curve M(B) becomes strongly anisotropic. The magnetization value per Ce in the phase-I region at 90 mK is apparently smaller than the Gamma(8) moment, indicating that either 8c or 4a site has a Gamma(7) ground state.

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  • Magnetic Properties of Ce3Pd20Si6 at Very Low Temperatures

    H. Mitamura, T. Sakuraba, T. Tayama, T. Sakakibara, S. Tsuduku, G. Ano, I. Ishii, M. Akatsu, Y. Nemoto, T. Goto, A. Kikkawa, H. Kitazawa

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)   200   2010

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    We have performed magnetization measurements of a single crystalline Ce3Pd20Si6 down to 90 mK in fields up to 11 T. Two transitions were recognized in M(T) at low fields; a cusp at 0.27 K due to a magnetic transition, and an upward bending at similar to 0.5 K that probably corresponds to a quadrupole transition. The latter critical temperature is found to be strongly enhanced in magnetic fields. The magnetization M(H) at 90 mK is strongly anisotropic above 0.6 T, and shows several sharp features associated with phase transitions. Interestingly, no appreciable anisotropy is found in the magnetic phase below 0.27 K and 0.6 T.

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  • Practical method and physics of evaluation for vacancy concentration of silicon crystals by measuring low-temperature elastic softening

    Hiroshi Yamada-Kaneta, Shotaro Baba, Yuta Nagai, Mitsuhiro Akatsu, Keisuke Mitsumoto, Takashi Yanase, Kazuki Okabe, Yasushi Ono, Yuichi Nemoto, Terutaka Goto

    ECS Transactions   33 ( 11 )   63 - 72   2010

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    The paper reports the recent progress of our research on the vacancies in boron-doped (B-doped) as-grown silicon crystals of commercial-base quality achieved by means of the low-temperature ultrasonic measurements. The paper also demonstrates how our research-base technique for the vacancy observation is established as the practical tool of evaluating the vacancy concentration of the commercial silicon crystals and wafers. An emphasis is made on the confirmation of the following findings obtained in our previous experiment for the elastic softening by the vacancies in boron-doped silicon crystals: (1) the steep softening that suddenly starts at 2-4 K in the cooling process, and (2) the complete disappearance of the softening by a weak magnetic field of 4 T applied along [111] direction. We further investigate in detail how the low-temperature softening at a fixed temperature responds to the applied magnetic field, to find the following characteristic anisotropy: The manner of disappearance of the softening strongly depends on the direction of the magnetic field. For the magnetic field imposed along [1-10] direction, nearly 60% of the full softening still remains even at a strong magnetic field of 8 T, in contrast to the case of the magnetic field applied along [111] direction. ©The Electrochemical Society.

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  • Quadrupole Order in Clathrate Compound Pr3Pd20Si6

    M. Akatsu, S. Tsuduku, Y. Nemoto, T. Goto, I. Ishii, K. Mitsumoto, G. Ano, H. Kobayashi, N. Takeda, A. Doenni, H. Kitazawa

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)   200   2010

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    In order to investigate ordered phases revealed at low temperatures in clathrate compound Pr3Pd20Si6, we have performed ultrasonic measurements using a single crystal in magnetic fields at low temperatures. Temperature dependence of elastic constant C-11 and C-L[1 (1) over bar0] = (C-11 + C-12 + C-2(44))/2 shows the anomalies at about 150 mK in zero field. Magnetic phase diagrams are determined by measuring C-11 in H parallel to [001] and C-L[1 (1) over bar0] in H parallel to [111]. The magnetic phase diagrams along the three principal axes indicate a closed loop and a strong magnetic anisotropy. This result suggests that antiferroquadrupole ordering appears at low temperatures in Pr3Pd20Si6.

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  • Multipole effects in non-Kramers doublet system PrMg3

    K. Araki, T. Yoshikawa, M. Akatsu, I. Ishii, Y. Nemoto, T. Goto, H. S. Suzuki, H. Tanida, S. Takagi, B. Luethi

    PHYSICA B-CONDENSED MATTER   404 ( 19 )   3187 - 3190   2009.10

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    We performed ultrasonic measurements on a single crystal of PrMg3. The characteristic Curie-type softening was observed in temperature dependence of transverse mode (C-11 - C-12)/2 below 8 K down to 0.8 K. This softening in PrMg3 is caused by a non-Kramers Gamma(3) doublet ground state having electric quadrupoles O-u and O-v and magnetic octupole T-xyz. The elastic constant (C-11 - C-12)/2 shows a minimum at 25 K, which cannot be explained by the quadrupole susceptibility based on the crystal electric field (CEF) levels. However, considering higher order (l = 4) multipole, namely electric hexadecapole, the minimum around 25 K was well reproduced. At lower temperatures, a shoulder anomaly in elastic constant being deviated from the Curie-type softening was observed around 100-800 mK in (C-11 - C-12)/2. This anomaly is unaffected by magnetic fields up to 14T. (C) 2009 Elsevier B.V. All rights reserved.

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  • Ultrasonic investigation of off-center rattling in Pr0.55Nd0.45Os4Sb12 Reviewed

    Tatsuya Yanagisawa, Taichi Mayama, Hiroyuki Hidaka, Hiroshi Amitsuka, Akio Yamaguchi, Koji Araki, Yuichi Nemoto, Terutaka Goto, Naoya Takeda, Pei-Chun Ho, M. Brian Maple

    PHYSICA B-CONDENSED MATTER   404 ( 19 )   3235 - 3237   2009.10

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    Ultrasonic measurements on a Pr0.55Nd0.45Os4Sb12 single crystal for temperature down to 20mK and frequencies up to 245 MHz were performed in order to investigate off-center rattling motion of rare-earth ions. The elastic constant C-11 exhibits double ultrasonic dispersions at similar to 15 and similar to 40 K, which are similar to the features found in NdOs4Sb12. The estimated activation energy E-1 = 240 K corresponding to the 40 K-dispersion, possesses an intermediate value between PrOs4Sb12 (E-1 = 115 K) and NdOs4Sb12 (E-1 = 337 K). (C) 2009 Elsevier B.V. All rights reserved.

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  • Quadrupole Ordering in Clathrate Compound Ce3Pd20Si6 Reviewed

    Terutaka Goto, Tomyuki Watanabe, Seiji Tsuduku, Haruki Kobayashi, Yuichi Nemoto, Tatsuya Yanagisawa, Mitsuhiro Akatsu, Genki Ano, Osamu Suzuki, Naoya Takeda, Andreas Donni, Hideaki Kitazawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   78 ( 2 )   2009.2

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    Low-temperature elastic properties of the clathrate compound Ce3Pd20Si6 were investigated using ultrasonic measurements. Pronounced softening of elastic constants (C-11 - C-12)/2 and C-44 with decreasing temperature indicates a precursor of electric quadrupole ordering due to it Gamma(8) quartet ground sate with an orbital degeneracy for 8c site of it Ce ion. A minimum of (C-11 - C-12)/2 at T-C = 170 mK indicates a transition from paramagnetic phase I to an ordered phase III. Applied magnetic fields induce an antiferro-quadrupole (AFQ) ordered phase II with highly anisotropic character depending on the field direction, which resembles the AFQ phase with O-xy-type order parameter in CeB6 with the Gamma(8) ground sate. The order parameter of the phase III may be characterized by either magnetic dipole or magnetic octupole. The Gamma(7) ground state at 4a site may fall into it singlet screened by conduction electrons at low temperatures Without long-range magnetic ordering.

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  • Low temperature x-ray diffraction study on superconductivity

    Y. Xue, H. Kaneko, Q. Tao, Z. Xu, N. Takeda, Y. Nemoto, T. Goto, H. Suzuki

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PT 5A   150 ( 5a )   2009

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    Using a low temperature x-ray diffractometer, we studied superconductivity materials, optimally doped and underdoped YBCOs and PrOs(4)Sb(12) between 0.1 K and 300 K. At several temperatures, whole profiles of the x-ray reflection peak were measured and refined by Rietveld analysis. By Rietveld analysis, we found that Pr atoms in PrOs(4)Sb(12) are still oscillating at an amplitude of about 0.1 angstrom at 0.18 K. For some reflection planes, x-ray diffraction measurement with a small step size and a long stepping time was performed to accumulate more counts at certain temperatures. The lattice constant d of optimally doped YBCO (OPT YBCO) shows anomalous behaviours at around the superconductivity transition temperature Tc and around spin gap temperature T*. In OPT YBCO, the intensity of the reflection spectrum shows a clear anomaly at around Tc.

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  • Low-temperature elastic softening due to vacancies in boron-doped FZ silicon crystals

    Hiroshi Yamada-Kaneta, Hajime Watanabe, Yuta Nagai, Shotaro Baba, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto

    Solid State Phenomena   156-158   135 - 138   2009

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    We confirm the following findings obt ained in our previous e xperiment for the low-temperature e lastic softening by the vacancies in boron-doped silicon crystals: (1) the steep softening that suddenly starts at 2-4 K in the cooling process, and (2) the complete disappearance of the softening by a weak magnetic field of 4 T applied along [111] direction. We further investigate in detail how the low-temperature softening at a fixed temperature responds to the applied magnetic field, to find the following characteristic anisotropy: The manner of disappearance of the softening strongly depends on the direction of the magnetic field. For the magnetic field imposed along [1-10] direction, nearly 60 % of the full softening still remains even at a strong magnetic field of 8 T, in contrast to the case of magnetic field applied along [111] direction. © (2010) Trans Tech Publications.

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  • Ultrasonic Dispersion in the Filled Skutterudite CeFe4Sb12

    I. Ishii, T. Suzuki, T. Fujita, I. Mori, H. Sugawara, M. Yoshizawa, Y. Nemoto, T. Goto

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4   150   2009

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    The rattling motion in Ce-based filled skutterudite CeFe4Sb12 has been investigated by means of ultrasonic measurements. We found ultrasonic dispersion obviously in elastic constant C-44 between 35 and 70 K, suggesting the rattling motion of Ce atoms, and obtained a relaxation time tau(0) = 1.5 x 10(-12) s and an excitation energy E = 345 K of the rattling motion. tau(0), E and the temperature range of ultrasonic dispersion in CeFe4Sb12 are a little lower than that in LaFe4Sb12 and PrFe4Sb12. Elastic softening in C-44 is not observed down to 4.2 K.

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  • Ultrasonic Study of Vacancy in Single Crystal Silicon at Low Temperatures

    M. Akatsu, T. Goto, H. Y-Kaneta, H. Watanabe, Y. Nemoto, K. Mitsumoto, S. Baba, Y. Nagai, S. Nakamura

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4   150   2009

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    We have performed ultrasonic measurements at low temperatures in order to investigate vacancy in single crystal silicon. The longitudinal elastic constants of non-doped and boron-doped silicon grown by a floating zone method exhibit appreciable softening with decreasing temperature down to 20 mK. The softening of boron-doped silicon is easily suppressed in applied magnetic field up to 2 T, while the softening of non-doped silicon is robust in fields even up to 16 T. The softening of elastic constants in high-purity crystalline silicon is certainly caused by the coupling of elastic strains of the ultrasonic waves to electric quadrupoles of the vacancy orbital.

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  • Vacancies in as-grown CZ silicon crystals observed by low-temperature ultrasonic measurements Reviewed

    Hiroshi Yamada-Kaneta, Terutaka Goto, Yuichi Nemoto, Koji Sato, Masatoshi Hikin, Yasuhiro Saito, Shintaro Nakamura

    JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS   19   S19 - S23   2008.12

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    By means of the low-temperature ultrasonic measurement, we try to observe the elastic softening due to the vacancies in as-grown silicon crystals grown by the Czochralski ( CZ) method. We prepared a high-resistivity CZ silicon crystal ingot comprising the following defect-regions: the void region, the region of ring-like oxidation stacking fault, the Pv-region, the Pi-region, and the region of the dislocation clusters. Both of the elastic constants C(44)(T) and [C(11)(T) - C(12)(T)]/2 measured for the samples taken from the Pv-region exhibit the softening of the type CC(T) = C(Gamma)((0)) [1 - Delta(JT)/(T - Theta)] which was also found in our previous study for the non-doped FZ silicon and attributed to the neutral vacancy. No response of the softening to the applied magnetic field is found, as in our previous case of the non-doped FZ silicon. The observed softenings are attributed to the triply degenerate T(2) states of the vacancy accommodating two electrons with anti parallel spins. The samples in the Pi-region exhibit no such softening, confirming that the origin of the softening is the vacancies. A qualitative explanation is given to the measured distribution of the vacancy concentration.

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  • Ultrasonic investigation of off-center rattling in filled skutterudite compound NdOs4Sb12 Reviewed

    Tatsuya Yanagisawa, Pei-Chun Ho, William M. Yuhasz, M. Brian Maple, Yuri Yasumoto, Hiromu Watanabe, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 7 )   2008.7

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    The off-center rattling of Nd rare-earth ions in the filled skutterudite compound NdOs4Sb12 has been investigated by ultrasonic measurement. The longitudinal C-11 mode for frequencies between 34 and 253MHz shows a marked frequency dependence in elastic constant and ultrasonic attenuations at two different temperatures centered at around 45 and 15K. The relaxational frequency dependence of ultrasonic dispersion reveals a thermally activated Gamma(23)-type off-center motion of Nd-ions, involving local charge fluctuations with Gamma(23) symmetry in the (OsSb3)(4) cage. An attempt time tau(0,(1)) = 7.5 x 10(-12) s and an activation energy E-1 = 337 K were obtained from fits to the dispersion at around 45 K. The presence of another dispersion at lower temperatures of around 15 K implies that the rattling in NdOs4Sb12 has an additional low-energy excitation characterized by a lower activation energy E-2 similar to 67 K with an attempt time tau(0,(2)) = 5.1 x 10(-11) s.

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  • Thermodynamic and transport studies of the ferromagnetic filled skutterudite compound PrFe4As12 Reviewed

    T. A. Sayles, W. M. Yuhasz, J. Paglione, T. Yanagisawa, J. R. Jeffries, M. B. Maple, Z. Henkie, A. Pietraszko, T. Cichorek, R. Wawryk, Y. Nemoto, T. Goto

    PHYSICAL REVIEW B   77 ( 14 )   2008.4

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    A variety of thermodynamic and transport measurements were made on high-quality single crystals of the Pr-based filled skutterudite compound PrFe4As12. Abrupt features in magnetization, ac susceptibility, specific heat, resistivity, thermoelectric power, and ultrasonic velocity reveal the onset of long range ferromagnetic order below Theta(C)=18 K. The low-temperature magnetic susceptibility is characterized by a Curie-Weiss law with an effective moment of 3.52 mu(B)/f.u. and a saturation magnetization of 2.3 mu(B)/f.u., which is consistent with a magnetic Gamma(5) triplet ground state. A gaplike reduction of the large electronic specific heat coefficient of 340 mJ/mol K-2 and several other features point to a strongly correlated electron behavior that is likely coupled to a change in magnetic and/or structural order near T-*similar or equal to 12 K. Furthermore, this complex magnetic state is found to be strongly field dependent, as evidenced by a change in the easy axis at low fields and an additional contribution to thermal conductivity appearing only at high fields.

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  • Guest Ion Motion in Cage Structure Crystals Investigated by Raman Scattering Reviewed

    Masayuki Udagawa, Takumi Hasegawa, Yuichi Takasu, Norio Ogita, Koichiro Suekuni, Marcos A. Avila, Toshiro Takabatake, Yoshikazu Ishikawa, Naoya Takeda, Yuichi Nemoto, Terutaka Goto, Hitoshi Sugawara, Daisuke Kikuchi, Hideyuki Sato, Chihiro Sekine, Ichimin Shirotani, Jun-Ichi Yamaura, Yohei Nagao, Zenji Hiroi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77   142 - 147   2008.1

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    Last five years we have mainly investigated phonons in the following cage compounds by Raman scattering: RT4X12, A(8)Ga(16)Ge(30), La3Pd20Ge6, RB6, KOs2O6. From this systematic investigation we have clarified the following dynamical properties of the guest ion trapped in the large cages. The vibration of the guest ion is highly anharmonic due to weak atomic interaction between the guest ion and cage atom. This anharmonicity universally decreases the vibration energy of the guest ion with decreasing temperature. The existence of carriers decreases the interaction between the guest atoms and changes the dispersion curve of the guest ion mode to flat, which is the experimental evidence of the weak interaction between the guest atoms. For thermoelectricity, it is found in A(8)Ga(16)Ge(30) that the off-center rattling decreases lattice thermal conductivity.

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  • Off-center Rattling and Tunneling in Filled Skutterudite LaOs4Sb12 Reviewed

    Yuri Yasumoto, Akio Yamaguchi, Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto, Akira Ochiai

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77   242 - 244   2008.1

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    Off-center rattling of La-ion in the filled skutterudite compound LaOs4Sb12 has been investigated by means of ultrasonic measurements. An elastic constant C-11 shows a remarkable frequency dependence in elastic constant and ultrasonic attenuation at around 25 K. This frequency dependent ultrasonic dispersion reveals thermally activated Gamma(23)-type off-center rattling of La-ion. An attempt time tau(0) = 5.0x10(-11) sec and an activation energy E = 127 K were obtained from the analysis.

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  • Quadrupole Susceptibility of Gamma(3) Pseudo-Doublet Ground State in Rare-Earth Garnet Tb3Ga5O12 Reviewed

    Kouji Araki, Terutaka Goto, Yuichi Nemoto, Tatsuya Yanagisawa, Bruno Luethi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77   269 - 271   2008.1

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    We have investigated elastic properties of a garnet-type single crystal Tb3Ga5O12 by ultrasonic measurements. Temperature dependence of the transverse elastic constants (C-11 - C-12)/2 and C-44 shows strong Curie-type softening below 150 K with minima around 30 - 50 K and also below 5 K. These effects are due to quadrupole susceptibilities for the crystalline electric field system with a pseudo-doublet Gamma(3) ground state and an excited triplet Gamma(5) at 57.3 K. Magnetic field dependence of the (C-11 - C-12)/2 mode in H parallel to [110] shows step-like anomaly due to a level crossing at around 9.5 T.

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  • Electric Quadrupole Effect in Clathrate Compound Pr3Pd20Si6 Reviewed

    Haruki Kobayashi, Seiji Tsuduku, Osamu Suzuki, Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto, Andreas Doenni, Hideaki Kitazawa, Naoya Takeda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77   263 - 265   2008.1

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    Electric quadrupole effects in a Pr-based clathrate compound Pr3Pd20Si6 have been investigated by ultrasonic measurements. Elastic constants of (C-11 - C-12)/2 and C-44 in Pr3Pd20Si6 show curie-type softenings with decreasing temperature below 20 K, which are described in terms of quadrupole effects of 4f-electron for the ground state either Gamma(3) doublet or Gamma(5) triplet. H-T phase diagram of Pr3Pd20Si6 under the magnetic fields along [110] is obtained from elastic anomalies in (C-11 - C-12)/2 mode.

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  • Vacancies in growth-rate-varied CZ silicon crystal observed by low-temperature ultrasonic measurements Reviewed

    Hiroshi Yamada-Kaneta, Terutaka Goto, Yuichi Nemoto, Koji Sato, Masatoshi Hikin, Yasuhiro Saito, Shintaro Nakamura

    GETTERING AND DEFECT ENGINEERING IN SEMICONDUCTOR TECHNOLOGY XII   131-133   455 - +   2008

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    The low-temperature ultrasonic experiments are performed to measure the distribution of vacancy concentration in the ingot of the Czochralski (CZ) silicon crystal grown with the pulling rate gradually lowered. The elastic softening similar to that we recently found for the floating-zone-grown silicon crystals is observed for the so-called vacancy-rich region of the ingot which contains no voids or dislocation clusters. We further uncover that the interstitial-rich region in the ingot exhibits no such elastic softening, confirming our previous conclusion that the defects responsible for the low-temperature elastic softening are the vacancies. We also disclose that the elastic softening is absent for the ring-like oxidation stacking fault (R-OSF) region of the ingot. The measured distribution of the vacancy concentration indicates that the minority point defects are perfectly cancelled by the majority point defects during the CZ crystal growth.

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  • Observation of vacancy in crystalline silicon using low-temperature ultrasonic measurements Reviewed

    Terutaka Goto, Hiroshi Yamada-Kaneta, Koji Sato, Masatoshi Hikin, Yuichi Nemoto, Shintaro Nakamura

    PHYSICA B-CONDENSED MATTER   401   109 - 114   2007.12

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    We have successfully observed isolated vacancies in crystalline silicon using low-temperature ultrasonic measurements. The floating zone (FZ) silicon exhibits softening in longitudinal elastic constants consisting of transverse C-44 and (C-11-C-12)/2 in part with decreasing temperature below 20 K down to 20 mK. The applied magnetic fields of up to 16 T at the base temperature 20 mK show no effect on the low-temperature softening in non-doped FZ silicon, while the fields of up to 2 T suppress the low-temperature softening in boron-doped FZ silicon. This experiment suggests that isolated vacancies with non-magnetic charge state V-0 in the non-doped FZ silicon and with magnetic charge state V+ in the boron-doped FZ silicon lead to the low-temperature softening. We have also observed the low-temperature softening in the Pv-region of non-doped Czochralski (CZ) silicon ingot, which indicates vacancy distribution. A coupling of electric quadrupoles of triplet state of vacancy orbital to the elastic strains of the sound waves is discussed for description of the low-temperature softening. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2007.08.124

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  • Vacancies in CZ silicon crystals observed by low-temperature ultrasonic measurements Reviewed

    Hiroshi Yamada-Kaneta, Terutaka Goto, Yuichi Nemoto, Koji Sato, Masatoshi Hikin, Yasuhiro Salto, Shintaro Nakamura

    PHYSICA B-CONDENSED MATTER   401   138 - 143   2007.12

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    By means of the low-temperature ultrasonic measurements, we try to observe the single vacancies in the as-grown Czochralski (CZ) silicon crystal of high resistivity and commercial-base quality. The crystal ingot we adopt here is grown with the pulling rate gradually lowered to produce various regions of different point-defect states. The elastic constants C-T2g(T) and C-Eg(7) measured for the samples taken from the Pv-region exhibit the softening of the type C-Gamma(T) = C-Gamma((0)) [1-Delta(JT)/(T-Theta)] which was found in our previous study for the non-doped FZ silicon and attributed to the neutral vacancy. The response of the softening to the applied magnetic field is found to be the same as in the case of the non-doped FZ silicon. The samples in the Pi-region exhibit no such softening, confirming that the origin of the softening is due to the vacancies. A qualitative explanation is given to the measured distribution of the vacancy concentration. For the CZ silicon crystals, the vacancies can be well observed for the Pv-region only. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2007.08.131

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  • Vacancy distribution in growth-rate-varied CZ silicon crystal observed by low-temperature ultrasonic measurements

    H. Yamada-Kaneta, M. Hikin, T. Goto, Y. Nemoto, K. Sato, Y. Saito, S. Nakamura

    Proceeding of the forum on the science and technology of silicon materials 2007   135 - 140   2007.11

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  • Piezoelectric ZnO sputtering on crystalline silicon for low-temperature ultrasonic measurements

    H. Watanabe, T. Goto, H. Yamada-Kaneta, Y. Nemoto, M. Hikin, T. Yanagisawa, S. Nakamura

    Proceeding of the forum on the science and technology of silicon materials 2007   141 - 142   2007.11

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  • Observation of vacancy in silicon using low-temperature ultrasonic measurements

    T. Goto, H. yamada-Kaneta, M. Hikin, H. Watanabe, K. Sato, Y. Nemoto, T. Yanagisawa, S. Nakamura

    Proceeding of the science and technology of silicon materials 2007   69 - 74   2007.11

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  • Ultrasonic study of rattling and tunneling in clathrate compounds R3Pd20X6 (R = La, Ce; X = Si, Ge) Reviewed

    Tomoyuki Watanabe, Takashi Yamaguchi, Yuichi Nemoto, Terutaka Goto, Naoya Takeda, Osamu Suzuki, Hideaki Kitazawa

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   280 - 282   2007.3

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    We have carried out an ultrasonic measurement to investigate an off-center motion of a rare-earth ion in clathrate compounds R3Pd20Si6 and R3Pd20Ge6. In R3Pd20Ge6, an elastic constant C-44 shows an ultrasonic dispersion around 10-30 K. This is caused by thermally activated rattling of the rare-earth ion over an anharmonic potential in the cage. In addition, the C-44 of La3Pd20Ge6 exhibits a remarkable softening proportional to 1/T below 3K down to 20 mK. This result indicates the tunneling state of the rare-earth ion through the potential barrier. On the other hand, the C-44 of La3Pd20Si6 and Ce3Pd20Si6 shows no ultrasonic dispersion indicating the absence of the rattling. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.10.329

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  • Ultrasonic investigations of antiferro-quadrupole ordering in Pr1-xLaxPb3 (x=0,0.02) Reviewed

    Motoi Fukuura, Shinya Jumonji, Yuichi Nemoto, Terutaka Goto, Hiroyuki. S. Suzuki, Toshiro Sakakibara

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   801 - 803   2007.3

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    We have investigated elastic properties of a single crystal PrPb3 showing antiferro-quadrupole (AFQ) ordering at T-Q = 0.4K using ultrasonic measurements. Since the crystalline-electric-field (CEF) ground state of PrPb3 is a non- Kramers Gamma(3) doublet having quadrupolar moments O-2(0) and O-2(2), the temperature dependence of a transverse (C-11 - C-12)/2 mode shows a curie- type softening with decreasing temperature toward T-Q. Furthermore, an anomaly accompanying a lock-in transition of AFQ ordering was observed in (C-11 - C-12)/2 on PrPb3 at 250mK. In the case of Pr0.98La0.02Pb3, (C-11 - C-12)/2 exhibits softening with decreasing temperature and shows a broad minimum at 330 mK. We have observed a large attenuation of the (C-11 - C-12)/2 mode in applying magnetic fields up to 13 T. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.10.002

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  • Magnetic phase diagrams of CexLa1-xB6 in high magnetic fields Reviewed

    Mitsuhiro Akatsu, Nanako Kazama, Terutaka Goto, Yuichi Nemoto, Osamu Suzuki, Giyuu Kido, Satoru Kunii

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   E172 - E174   2007.3

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    We have performed ultrasonic measurements under high magnetic fields up to 30T by using the hybrid magnet at the National Institute for Materials Science to investigate the magnetic phase diagram for antiferroquadrupole (AFQ) phase II in CexLa1-xB6. With increasing Ce concentration x from x = 0.50, the AFQ phase transition temperatures T-Q indicate an almost linear increase in various fields. The large magnetic anisotropy of AFQ phase II, in which T-Q(H) (parallel to 001]) is much smaller than T-Q(H) (parallel to 110]) and T-Q(H) (parallel to 111]) in high magnetic fields, is revealed in x = 0.75; 0.60 as well as in x = 0.50. These experimental results support the theoretical calculation based on the Gamma(5)-type AFQ ordering and the magnetic field induced octupole T-xyz. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.10.126

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  • Quadrupolar susceptibility of NdOs4Sb12 Reviewed

    Tatsuya Yanagisawa, William M. Yuhasz, Pei-Chun Ho, M. Brian Maple, Hiromu Watanabe, Takafumi Ueno, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   223 - 225   2007.3

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    Elastic constants of filled-skutterudite NdOs4Sb12 single crystals have been investigated by means of ultrasonic measurements. Transverse C-44 and longitudinal C-11 modes show Curie-type softening, which is proportional to the reciprocal temperature from 10K down to 0.9K. This softening can be explained in terms of the quadrupolar susceptibility modified by crystalline electric field with a Gamma(8) quartet ground state in O-h symmetry. The C-11 mode also shows a broad shoulder and a small dip around 45 and 13 K, respectively. A Debye-type frequency dependence of the anomalies in the longitudinal C-11 mode resembles an ultrasonic dispersion in PrOs4Sb12, which is expected to be due to the "rattling'' effect, a thermally activated off-center motion of the rare-earth atom in the Sb-cage. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.10.010

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  • Vacancies in defect-free zone of point-defect-controlled CZ silicon observed by low-temperature ultrasonic measurements Reviewed

    Hiroshi Yamada-Kaneta, Terutaka Goto, Yasuhiro Saito, Yuichi Nemoto, Koji Sato, Koichi Kakimoto, Shintaro Nakamura

    MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY   134 ( 2-3 )   240 - 243   2006.10

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    The low-temperature ultrasonic measurements are performed for the direct observation of the vacancies in Czochralski-grown (CZ-grown) silicon crystal. The elastic softening similar to that we recently found for the floating-zone-grown (FZ-grown) silicon crystals is observed also for the vacancy-rich region of the defect-free zone (DFZ) in the CZ silicon crystal. We further uncover that both of the interstitial -rich region in the DFZ and the region of the ring-like oxidation-induced stacking faults of the same crystal ingot exhibit no such elastic softening of detectable magnitude, confirming our previous conclusion that the defects responsible for the low-temperature softening are the vacancies. We observe how the vacancy concentration in the DFZ varies along the pulling direction. (c) 2006 Published by Elsevier B.V.

    DOI: 10.1016/j.mseb.2006.07.032

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  • Direct observation of vacancy in silicon using sub-Kelvin ultrasonic measurements Reviewed

    Terutaka Goto, Hiroshi Yamada-Kaneta, Yasuhiro Saito, Yuichi Nemoto, Koji Sato, Koichi Kakimoto, Shintaro Nakamura

    MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY   134 ( 2-3 )   233 - 239   2006.10

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    We carried out sub-Kelvin ultrasonic measurements for observation of vacancies in crystalline silicon. The longitudinal elastic constants of non-doped and B-doped floating zone (FZ) silicon crystals in commercial base revealed low-temperature elastic softening below 20 K. The applied magnetic fields turns the softening of the B-doped FZ silicon to a temperature-independent behavior, while the fields up to 16 T at base temperature 20 mK make no effect on the softening of the non-doped FZ silicon. This result means that the vacancy accompanying the non-magnetic charge state V-0 in the non-doped silicon and the magnetic V+ in the B-doped silicon is responsible for the low-temperature softening through the Jahn-Teller effect. The direct observation of the vacancy using the sub-Kelvin ultrasonic measurements advances point defects controlling in silicon wafers and semiconductor devices. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.mseb.2006.07.038

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  • Rattling and tunneling of off-center local oscillator in clathrate compounds Reviewed

    Terutaka Goto, Yuichi Nemoto, Takashi Yamaguchi, Tatsuya Yanagisawa, Takafumi Ueno, Tomoyuki Watanabe, Naoya Takeda, Osamu Suzuki, Hideaki Kitazawa, Hitoshi Sugawara, Hideyuki Sato

    PHYSICA B-CONDENSED MATTER   383 ( 1 )   115 - 119   2006.8

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    We have investigated an off-center local oscillator of a guest atom in cage of clathrate compounds R3Pd20Ge6 (R = La, Ce, Pr, Nd) and a filled skutterudite PrOs4Sb12 using ultrasonic measurements. The observation of ultrasonic dispersions in transverse C-44 mode of R3Pd20Ge6 and in transverse (C-11 - C-12)/2 mode of PrOs4Sb12 revealed the rattling of the off-center oscillator characterized by a relaxation time with Arrhenius-type temperature dependence. A low-temperature softening of C-44 in La3Pd20Ge6 below 3 K down to 20 mK and a softening of (C-11 - C-12)/2 in PrOs4Sb12 above the heavy Fermion superconducting transition indicate the charge fluctuation due to the degenerate off-center oscillators. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2006.03.071

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  • Multiple ordered phases in the filled skutterudite compound Pr Os4 As12 Reviewed International coauthorship International journal

    Yuhasz, W.M., Butch, N.P., Sayles, T.A., Ho, P.-C., Jeffries, J.R., Yanagisawa, T., Frederick, N.A., Maple, M.B., Henkie, Z., Pietraszko, A., McCall, S.K., McElfresh, M.W., Fluss, M.J.

    Physical Review B - Condensed Matter and Materials Physics   73 ( 14 )   2006.4

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    Magnetization, specific heat, and electrical resistivity measurements were made on single crystals of the filled skutterudite compound Pr Os4 As12. Specific heat measurements indicate an electronic specific heat coefficient γ∼50-200 mJ mol K2 at temperatures 10 K≤T≤18 K, and ∼1 J mol K2 for T≤1.6 K. The combined measurements reveal the presence of two, or possibly three, ordered phases at temperatures below ∼2.3 K and in fields below ∼3 T. The low temperature phase displays antiferromagnetic characteristics, while the nature of the ordering in the other phase(s) has yet to be determined. © 2006 The American Physical Society.

    DOI: 10.1103/PhysRevB.73.144409

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  • Magnetic phase diagram of antiferroquadrupole ordering in HoB2C2 Reviewed

    T Yanagisawa, T Goto, Y Nemoto, R Watanuki, K Suzuki, O Suzuki, G Kido

    PHYSICAL REVIEW B   71 ( 10 )   2005.3

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    The magnetic phase diagram for antiferroquadrupole (AFQ) ordering in tetragonal HoB2C2 has been investigated by measurements of elastic constants C-11, C-44, and C-66 in fields along the basal x-y plane as well as the principal [001]-axis. The hybrid magnet (GAMA) in Tsukuba Magnetic Laboratory was employed for high field measurements up to 30 T. The AFQ phase is no longer observed above 26.3 T along the principal [001]-axis in contrast to the relatively small critical field of 3.9 T in fields applied along the basal [110]-axis. The quadrupolar intersite interaction of O-xy and/or O-2(2) is consistent with the anisotropy in the magnetic phase diagram of the AFQ phase in HoB2C2.

    DOI: 10.1103/PhysRevB.71.104416

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  • Ultrasonic investigation of quadrupole ordering in HoB2C2 Reviewed

    T Yanagisawa, T Goto, Y Nemoto, S Miyata, R Watanuki, K Suzuki

    PHYSICAL REVIEW B   67 ( 11 )   2003.3

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    The elastic properties of HoB2C2 undergoing an antiferroquadrupole ordering with a tetragonal structure have been investigated by means of ultrasonic measurements. The transverse (C-11-C-12)/2, C-44, and C-66 modes exhibit characteristic softenings with decreasing temperature in a paramagnetic phase I down to an ordered phase IV at T-C1=5.9 K. The softening of (C-11-C-12)/2, C-44 and C-66 is described by a formula C-Gamma=C-Gamma(0)(T-T-C(0))/(T-Theta) due to the quadrupole-strain interaction for the 4f state of HoB2C2 consisting of a ground E doublet with orbital degeneracy and an excited singlet with a small-energy splitting Delta. The significant softening of the elastic constant and the ultrasonic attenuation in phase IV between T-C1=5.9 K and T-C2=5.0 K have been found. The ultrasonic dispersion in phase IV indicates the slowing down of the quadrupole fluctuation time, tau=7x10(-9) sec.

    DOI: 10.1103/PhysRevB.67.115129

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  • Ultrasonic investigation of antiferroquadrupole orderings in HoB2C2 and DyB2C2 Reviewed

    T Goto, T Yanagisawa, K Hyodo, Y Nemoto, S Miyata, R Watanuki, K Suzuki

    ACTA PHYSICA POLONICA B   34 ( 2 )   1173 - 1176   2003.2

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    The antiferroquadrupole orderings of the ternary rare earth compounds HoB2C2 and DyB2C2 have been investigated by means of ultrasonic measurements. The transverse (C-11-C-12)/2, C-44, C-66 modes in HoB2C2 exhibit characteristic softening above T-c2 = 5.0 K, which consist with an E-doublet and a singlet for the ground state. Considerable elastic softening and ultrasonic attenuation in phase IV below T-c1 = 5.9 K of HoB2C2 indicates an enhancement of the quadrupole fluctuation with a relaxation rate tau = 7 x 10(-9) sec. A softening of the transverse elastic constant C-44 in DyB2C2 above T-Q = 24.7 K indicates accidentally degenerated Kramers doublets of E-1/2 and E-3/2 for the ground state.

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  • Thermal Expansion Measurements on Ce0.75La0.25B6 Reviewed

    Mitsuhiro Akatsu, Osamu Suzuki, Yuichi Nemoto, Terutaka Goto, Shintaro Nakamura, Satoru Kunii

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   115 - 117   2002.1

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    We have made low-temperature thermal expansion and magnetostriction measurements on the Kongo compound Ce0.75La0.25B6. With decreasing temperature, Ce0.75La0.25B6 in phase IV expands along the [0011 axis and shrinks along the r1111 axis, A tiny anisotropic distortion is found in this phase. Probably, some kinds of macroscopic symmetry are breaking in phase IV.

    DOI: 10.1143/JPSJS.71S.115

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  • Anisotropy in the Magnetic Phase Diagrams of CexLa1-xB6 Reviewed

    Shintaro Nakamura, Osamu Suzuki, Terutaka Goto, Yuichi Nemoto, Mitsuhiro Akatsu, Satoru Kunii

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   112 - 114   2002.1

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    Anisotropy in the magnetic phase diagrams (H-T plane) of CexLa1-xB6 and the Ce concentration dependence of the magnetic phase diagrams are presented. Phase boundaries of phase IV in the diagrams are isotropic. Present results suggest the absence of quadrupolar degeneracy in phase IV. Field induced antiferromagnctism is shown in CexLa1-xB6.

    DOI: 10.1143/JPSJS.71S.112

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  • Quadrupole Susceptibility of HoB2C2 Reviewed

    Terutaka Goto, Tatsuya Yanagisawa, Yuichi Nemoto, Shingo Miyata, Ryuta Watanuki, Kazuya Suzuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   88 - 90   2002.1

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    We have investigated the elastic constants of the ternary rare earth compound HoB2C2 with a tetragonal structure, by means of the ultrasonic method. The elastic constants of (C-11- C-12)/2, C-44 and C-66,, corresponding to the transverse ultrasonic modes exhibit the softening proportional to reciprocal temperature below about 40 K. This softening is commonly enhanced in the ordered phase IV below T-C1 = 5.9 K. An abrupt increase of elastic constants is found in the ordered phase UI below T-C2 = 5,0 K characterized by the simultaneous antiferro-type ordering of electric quadrupole and magnetic dipole moments. The quadrupole susceptibility based on a model consisting of a ground state E-doublet and an excited singlet with a low energy in HoB2C2 is employed for the analysis of the softening above T-C1 = 5.9 K. The enhancement of the elastic softening in the phase IV of HoB2C2 resembles to the soft C44 mode in the phase IV in Ce0,751La0.25B6.

    DOI: 10.1143/JPSJS.71S.88

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  • Ultrasonic Investigation of Metarnagnetic Transition in CeRu2Si2 Reviewed

    Yanagisawa, Tatsuya, Nemoto, Yuichi, Goto, Terutaka, Onuki, Yoshichika

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   267 - 269   2002.1

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    We have performed low-temperature ultrasonic measurements on CeRu2Si2 by using a dilution refrigerator down to 20 niK with a superconducting magnet up to 16 T. The longitudinal modes exhibit huge softening of 20% around a metamagnetic transition point H-C similar to 7.7 T, while the transverse modes show softening of about 1%. This result suggests that the coupling of the volume strain epsilon(B) to the order parameter with total symmetry plays a crucial role for the metamagnetic.transition in CeRu2Si2. In the vicinity of H-C, the enormous ultrasonic attenuation has been observed in the longitudinal ultrasonic modes. The relaxation time tau increases considerably near the metamagnetic transition due to a critical stowing-down. We also show the detailed magnetic phase diagram of CeRu2Si2 down to 20 mK around H-C.

    DOI: 10.1143/JPSJS.71S.267

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  • Magnetic Field Dependence of Elastic Constants in Pr1-xCaxMnO3 Reviewed

    Hirofumi Hazama, Yuichi Nemoto, Terutaka Goto, Yasuhide Tomioka, Atsushi Asamitsu, Yoshinori Tokura

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   139 - 141   2002.1

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    We have investigated charge and orbital (quadrupolar) ordering in perovskite manganites Pr1-xCaxMnO3 (x = 0.35, 0.40, 0.50) by ultrasonic measurements. Only transverse (C-11-C-12)/2 mode of the;-r, = 0.35, 0.40 and 0.50 compounds shows a softening from 400 K down to the charge ordering point T-co = 220 240 K. Tins softening is originated from the bilinear coupling of the quadrupole moment of the eg orbital in Mn3+ ion to the elastic strain. Furthermore, the elastic softening in both (C-11 = C-12)/2 and C-44 modes due to the coupling of the charge fluctuation mode to elastic strain is observed just above T-co, especially for the x = 0.50 compound. The considerable magnetic field dependence of the elastic constants is obseved. In particular, the magnetic fields up to 12 T releases completely the elastic softening of (C-11 - C-12)/2 mode due to the fact that the charge fluctuation is suppressed under 12 T in the = 0.40 compound.

    DOI: 10.1143/JPSJS.71S.139

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  • Coulombic Insight into Charge Ordering in Yb4As3 and Sm3Te4 Reviewed

    Hiroshi Iyetomi, Hideto Higashi, Yuichi Nemoto, Terutaka Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   306 - 308   2002.1

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    Charge ordering in Yb4As3 and Sm3Te4, complementary f-electron compounds with the same crystalline structure, is investigated on the basis of a Coulomb lattice gas model; the Coulomb interactions between ions are fully taken into account within a classical treatment. The Madelung energy of the system at finite temperatures is calculated with a Monte Carlo (MC) method simulating the Boltzmann distribution of multivalent cations on equivalent lattice sites. The unit cell for the MC simulations is extended to contain 32 molecular formulas in it. The model is successful in distinguishing the two mixed-valence compounds with different, characteristics of charge ordering. Yb4As3 shows a phase transition (Verwey transition) due to charge ordering while Sm3Te4 continuously freezes into a glassy state on cooling.

    DOI: 10.1143/JPSJS.71S.306

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  • Ultrasonic investigation of perovskite manganese compounds La1-xSrxMnO3 Reviewed

    T Goto, Y Nemoto, H Hazama, Y Tomioka, A Asamitsu, Y Tokura

    PHYSICS IN LOCAL LATTICE DISTORTIONS: FUNDAMENTALS AND NOVEL CONCEPTS LLD2K   554   417 - 421   2001

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    We made the ultrasonic measurements on the perovskite manganese La1-xSrxMnO3 (x = 0.12, 0.165) to examine the electron-lattice interaction in the system with both orbital and charge degrees of freedom. The softening of (C-11 - C-12)/2 above the structural transition point T-s = 290 K for x = 0.12 and T-s = 310 K for x = 0.165 is well described in terms of the quadrupolar susceptibility for O-2(0) and O-2(2) of d gamma -doublet of Mn3+. Elastic softening associated with the charge ordering of Mn4+ ions in a sea of Mn3+ ions for x = 0.12 and x = 0.165 is also presented.

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    佐藤晴耕, 山石開人, 赤津光洋, 根本祐一, 山本裕介, 小林義明, 伊藤正行

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    根本祐一, 佐藤晴耕, 赤津光洋, 栗原綾佑, 小林義明

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    赤津光洋, 大隅響, 林祥子, 佐藤晴耕, 根本祐一

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  • Ultrasonic study of the quadrupole effects in the structural phase transition of Nb-doped SrTiO<sub>3</sub>: III

    林祥子, 赤津光洋, 佐藤晴耕, 根本祐一

    日本物理学会講演概要集(CD-ROM)   76 ( 1 )   2021

  • Ultrasonic study of ground state of valence fluctuation compound SmS under hydrostatic pressures: II

    笛木勇真, 渡部聡, 佐藤晴耕, 赤津光洋, 根本祐一, 井村敬一郎, 佐藤憲昭, 鈴木博之

    日本物理学会講演概要集(CD-ROM)   76 ( 1 )   2021

  • Dynamical critical behavior of ultrasonic attenuation near the quantum critical point in iron pnictide superconductor Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub>

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    日本物理学会講演概要集(CD-ROM)   76 ( 2 )   2021

  • Ultrasound injection effect on neutron scattering of Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>

    社本真一, 社本真一, 社本真一, 社本真一, 赤津光洋, 松浦直人, 安井幸夫, CHANG L.-J., 根本祐一, 家田淳一

    日本物理学会講演概要集(CD-ROM)   76 ( 2 )   2021

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    社本真一, 社本真一, 社本真一, 社本真一, 赤津光洋, 松浦直人, 安井幸夫, 伊藤孝, 根本祐一, 家田淳一

    量子ビームサイエンスフェスタ(Web)   2020   2021

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    徳永淳志, 佐藤晴耕, 赤津光洋, 根本祐一, 横山淳

    日本物理学会講演概要集(CD-ROM)   76 ( 1 )   2021

  • Temperature and magnetic field dependences of elastic constants in approximant Au<sub>51</sub>Al<sub>35</sub>Yb<sub>14</sub>

    根本祐一, 岩瀬智也, 佐藤晴耕, 赤津光洋, 平野由真, 岡本稔彦, 米山祐樹, 出口和彦, 佐藤憲昭

    日本物理学会講演概要集(CD-ROM)   76 ( 1 )   2021

  • Temperature and Magnetic field dependences of Elastic Constants in Quasicrystal Au<sub>51</sub>Al<sub>34</sub>Yb<sub>15</sub>

    岩瀬智也, 佐藤晴耕, 赤津光洋, 根本祐一, 平野由真, 岡本稔彦, 米山祐樹, 出口和彦, 佐藤憲昭

    日本物理学会講演概要集(CD-ROM)   76 ( 1 )   2021

  • Ultrasonic Study of lattice instability in 1T-TiSe<sub>2</sub>

    赤津光洋, 佐藤晴耕, 山石開人, 根本祐一, 山本裕介, 小林義明, 伊藤正行

    日本物理学会講演概要集(CD-ROM)   76 ( 1 )   2021

  • Observation of Vacancy Orbital in Phosphorus-Doped Silicon by Ultrasonic Measurements

    小日向智仁, 村上ちひろ, 佐藤晴耕, 赤津光洋, 根本祐一

    日本物理学会講演概要集(CD-ROM)   76 ( 1 )   2021

  • Ultrasounic measurements of elastic constants in 1T-TiSe<sub>2</sub>

    根本祐一, 佐藤晴耕, 赤津光洋, 山本裕介, 小林義明, 伊藤正行

    日本物理学会講演概要集(CD-ROM)   75 ( 2 )   2020

  • Ultrasonic Study of Structural Phase Transition in 1T-TiSe<sub>2</sub>

    赤津光洋, 佐藤晴耕, 根本祐一, 山本裕介, 小林義明, 伊藤正行

    日本物理学会講演概要集(CD-ROM)   75 ( 1 )   2020

  • Observation of Vacancy Orbital in Phosphorus-Doped Czochralski Silicon by Ultrasonic Measurements

    小日向智仁, 村上ちひろ, 赤津光洋, 根本祐一

    日本物理学会講演概要集(CD-ROM)   75 ( 2 )   2020

  • Ultrasonic study of the elastic constant under hydrostatic pressures in heavy-fermion superconductor CeCoIn<sub>5</sub>

    徳永淳志, 佐藤晴耕, 赤津光洋, 根本祐一, 横山淳

    日本物理学会講演概要集(CD-ROM)   75 ( 2 )   2020

  • Ultrasonic study of the quadrupole effects in the structural phase transition of Nb-doped SrTiO<sub>3</sub>: II

    林祥子, 赤津光洋, 佐藤晴耕, 根本祐一

    日本物理学会講演概要集(CD-ROM)   75 ( 2 )   2020

  • Ultrasonic study of ground state of valence fluctuation compound SmS under hydrostatic pressures.

    笛木勇真, 渡部聡, 佐藤晴耕, 赤津光洋, 根本祐一, 井村敬一郎, 佐藤憲昭, 鈴木博之

    日本物理学会講演概要集(CD-ROM)   75 ( 2 )   2020

  • Elastic softening in Au-Al-Yb quasicrystal and approximant crystal

    赤津光洋, 岩瀬智也, 佐藤晴耕, 根本祐一, 平野由真, 岡本稔彦, 米山祐樹, 出口和彦, 佐藤憲昭

    日本物理学会講演概要集(CD-ROM)   75 ( 2 )   2020

  • Ultrasonic study of the quadrupole effects in the structural phase transition of Nb-doped SrTiO<sub>3</sub>

    林祥子, 赤津光洋, 佐藤晴耕, 根本祐一

    日本物理学会講演概要集(CD-ROM)   75 ( 1 )   2020

  • Ultrasound Measurements of Elastic Constants in Quasicrystal and Approximants Au-Al-Yb Systems

    岩瀬智也, 佐藤晴耕, 赤津光洋, 根本祐一, 平野由真, 岡本稔彦, 米山祐樹, 出口和彦, 佐藤憲昭

    日本物理学会講演概要集(CD-ROM)   75 ( 1 )   2020

  • Quadrupole Effects of Iron Pnictide Superconductor Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub> Around the Quantum Critical Point

    佐藤晴耕, 根本祐一, 赤津光洋, 後藤輝孝, 栗原綾佑, 三本啓輔, 小林義明, 佐藤正俊

    日本物理学会講演概要集(CD-ROM)   75 ( 1 )   2020

  • Anomalous properties of Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> and magnetic inelastic neutron scattering

    社本真一, 安井幸夫, 松浦直人, 赤津光洋, 家田淳一, 針井一哉, 小野正雄, 山本慧, 伊藤孝, 根本祐一

    日本物理学会講演概要集(CD-ROM)   75 ( 1 )   2020

  • Ultrasound measurements of elastic constants in Au-Al-Yb quasicrystal

    根本祐一, 岩瀬智也, 佐藤晴耕, 赤津光洋, 平野由真, 岡本稔彦, 米山祐樹, 出口和彦, 佐藤憲昭

    日本物理学会講演概要集(CD-ROM)   75 ( 1 )   2020

  • Quadrupole Effects of Iron Pnictide Superconductor Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub> Around the Quantum Critical Point

    佐藤晴耕, 赤津光洋, 根本祐一, 後藤輝孝, 栗原綾佑, 三本啓輔, 小林義明, 佐藤正俊

    日本物理学会講演概要集(CD-ROM)   75 ( 2 )   2020

  • Ultrasound Measurements of Elastic Constants in Quasicrystal and Approximants Au-Al-Yb Systems

    岩瀬智也, 佐藤晴耕, 赤津光洋, 根本祐一, 平野由真, 岡本稔彦, 米山祐樹, 出口和彦, 佐藤憲昭

    日本物理学会講演概要集(CD-ROM)   75 ( 2 )   2020

  • Neutron scattering study on Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> under ultrasound irradiation

    社本真一, 松浦直人, 赤津光洋, 安井幸夫, 伊藤孝, 家田淳一, 遠藤仁, 小田達郎, チャン リージェン, 根本祐一, 柴田薫

    量子ビームサイエンスフェスタ(Web)   2018   2019

  • イットリウム鉄ガーネットを用いた超音波印加下での中性子散乱実験

    社本真一, 松浦直人, 赤津光洋, 伊藤孝, 家田淳一, 遠藤仁, 小田達郎, チャン リージェン, 根本祐一, 柴田薫

    日本原子力研究開発機構JAEA-Review(Web)   ( 2018-024 )   2019

  • 超音波印加下でのY<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>のスピンポンピングと中性子磁気散乱

    社本真一, 赤津光洋, 松浦直人, 家田淳一, 安井幸夫, 針井一哉, 小野正雄, 山本慧, 伊藤孝, 根本祐一

    日本物理学会講演概要集(CD-ROM)   74 ( 2 )   2019

  • 極低温超音波実験による希土類カゴ状化合物CePt<sub>2</sub>Cd<sub>20</sub>の基底状態の研究

    赤津光洋, 上原啓史, 根本祐一, 後藤輝孝, 三本啓輔, 土塔寛, 広瀬雄介, 摂待力生

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   2019

  • 超音波印加下でのY<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>の中性子散乱実験

    社本真一, 松浦直人, 赤津光洋, 安井幸夫, 伊藤孝, 家田淳一, 遠藤仁, 小田達郎, CHANG L.-J., 根本祐一, 柴田薫

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   2019

  • ボロン添加シリコン中の原子空孔軌道の量子状態がもつ電気多極子効果

    三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝

    日本物理学会講演概要集(CD-ROM)   73 ( 2 )   ROMBUNNO.10aPS‐81   2018.9

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  • 鉄ヒ素超伝導体における歪み・回転と相互作用する多極子の対称性破れ

    根本祐一, 佐藤晴耕, 赤津光洋, 後藤輝孝, 栗原綾佑, 三本啓輔, 小林義明, 佐藤正俊

    日本物理学会講演概要集(CD-ROM)   73 ( 2 )   ROMBUNNO.10pPSB‐6   2018.9

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  • 超音波による重い電子系化合物UPd<sub>2</sub>Cd<sub>20</sub>の量子状態の研究 II

    赤津光洋, 上原啓史, 武石夏祈, 根本祐一, 後藤輝孝, 三本啓輔, 土塔寛, 広瀬雄介, 摂待力生, 本多史憲, 青木大

    日本物理学会講演概要集(CD-ROM)   73 ( 2 )   ROMBUNNO.10pPSB‐67   2018.9

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  • 超音波による希土類カゴ状化合物PrRh<sub>2</sub>Cd<sub>20</sub>の弾性定数測定

    今井里保, 赤津光洋, 根本祐一, 後藤輝孝, 栗原綾佑, 三本啓輔, 土塔寛, 広瀬雄介, 摂待力生

    日本物理学会講演概要集(CD-ROM)   73 ( 2 )   ROMBUNNO.11pPSB‐9   2018.9

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  • 応力印加によるボロン添加シリコン中の原子空孔軌道の四極子‐歪み相互作用

    三本啓輔, 坂井隼人, 赤津光洋, 根本祐一, 後藤輝孝

    日本物理学会講演概要集(CD-ROM)   73 ( 1 )   ROMBUNNO.22aPS‐28   2018.3

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  • パルス強磁場下での超音波計測による鉄ヒ素超伝導体Ba(Fe<sub>0.925</sub>Co<sub>0.075</sub>)<sub>2</sub>As<sub>2</sub>の四極子‐歪み相互作用の研究

    栗原綾佑, 三本啓輔, 赤津光洋, 根本祐一, 根本祐一, 後藤輝孝, 後藤輝孝, 小林義明, 小林義明, 佐藤正俊, 佐藤正俊, 徳永将史, 三宅厚志, 秋葉和人

    日本物理学会講演概要集(CD-ROM)   73 ( 1 )   ROMBUNNO.22aPS‐3   2018.3

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  • 超音波による重い電子系化合物UPd<sub>2</sub>Cd<sub>20</sub>の量子状態の研究

    赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 土塔寛, 広瀬雄介, 摂待力生, 本多史憲, 青木大

    日本物理学会講演概要集(CD-ROM)   73 ( 1 )   ROMBUNNO.23aPS‐114   2018.3

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  • Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>の高エネルギーマグノン分散とそのシミュレーション

    社本真一, 伊藤孝, 大西弘明, 松浦直人, 赤津光洋, 中村充孝, 稲村泰弘, 樹神克明, 河村聖子, 根本祐一, 柴田薫

    日本物理学会講演概要集(CD-ROM)   73 ( 1 )   ROMBUNNO.23pK304‐3   2018.3

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  • 急冷凍結したシリコンウェーハ中の高温熱平衡原子空孔の低温超音波法による濃度測定

    金田寛, 根本祐一, 赤津光洋, 三本啓輔

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   65th   ROMBUNNO.18p‐D103‐14   2018.3

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  • 超音波印加下でのイットリウム鉄ガーネットの中性子散乱実験

    社本真一, 松浦直人, 赤津光洋, 伊藤孝, 家田淳一, 遠藤仁, 小田達郎, CHANG L.-J., 根本祐一, 柴田薫

    日本中性子科学会年会講演概要集   18th   2018

  • 鉄ヒ素超伝導体Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub>の歪みと回転フォノンによる多極子秩序と超伝導

    栗原綾佑, 三本啓輔, 赤津光洋, 根本祐一, 根本祐一, 後藤輝孝, 後藤輝孝, 小林義明, 小林義明, 佐藤正俊, 佐藤正俊, 佐藤正俊

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   ROMBUNNO.21aC10‐7   2017.9

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  • 鉄ヒ素系超伝導体Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub>の強磁場中の四極子効果

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    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   ROMBUNNO.23aPS‐18   2017.9

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  • 鉄ヒ素超伝導体における十六極子秩序と超伝導

    三本啓輔, 栗原綾佑, 赤津光洋, 根本祐一, 根本祐一, 後藤輝孝, 後藤輝孝, 小林義明, 小林義明, 佐藤正俊, 佐藤正俊, 佐藤正俊

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   ROMBUNNO.23aPS‐19   2017.9

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  • Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>の超低エネルギースピン波の分散

    社本真一, 松浦直人, 赤津光洋, 伊藤孝, 根本祐一, 柴田薫

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   ROMBUNNO.23aE20‐10   2017.9

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  • 曲げ応力下でのボロン添加シリコンウェーハの原子空孔軌道の研究

    坂井隼人, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   ROMBUNNO.23aPS‐112   2017.9

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  • 弾性定数の低温ソフト化と磁場依存性によるシリコン原子空孔の量子状態解明

    根本祐一, 坂井隼人, 赤津光洋, 三本啓輔, 後藤輝孝

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   ROMBUNNO.23aPS‐111   2017.9

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  • 低温領域における希土類カゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の磁場中熱膨張測定 III

    関口祐太, 峯岸光如, 小野拓哉, 宮本惇也, 阿部聡, 松本宏一, 阿野元貴, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, 北澤英明

    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   ROMBUNNO.17pK‐PS‐37   2017.3

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  • 価数揺動物質SmSの静水圧下超音波実験

    赤津光洋, 瓦井有香, 三本啓輔, 根本祐一, 後藤輝孝, 井村敬一郎, 佐藤憲昭, 鈴木博之

    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   ROMBUNNO.20aC‐PS‐18   2017.3

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  • 鉄ヒ素超伝導体の十六極子秩序による超音波吸収と超伝導状態 II

    栗原綾佑, 三本啓輔, 赤津光洋, 根本祐一, 根本祐一, 後藤輝孝, 後藤輝孝, 小林義明, 小林義明, 佐藤正俊, 佐藤正俊, 佐藤正俊

    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   ROMBUNNO.18aK‐PS‐14   2017.3

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  • 超音波による希土類カゴ状化合物PrPt<sub>2</sub>Cd<sub>20</sub>の低温物性研究

    根本祐一, 藤原万里子, 赤津光洋, 三本啓輔, 後藤輝孝, 土塔寛, 広瀬雄介, 摂待力生

    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   ROMBUNNO.17pK‐PS‐38   2017.3

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  • 超音波によるCeAl<sub>2</sub>の低温物性の研究

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    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   ROMBUNNO.18aK‐PS‐15   2017.3

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    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   ROMBUNNO.18pS‐PS‐30   2017.3

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  • 超音波吸収による鉄ヒ素超伝導体の電気十六極子秩序の観測と超伝導転移

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    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   ROMBUNNO.14aPS‐61 - 1897   2016.9

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    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   ROMBUNNO.13pJA‐15 - 1778   2016.9

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    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   ROMBUNNO.15aPS‐45 - 2111   2016.9

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    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   ROMBUNNO.14pAA‐12 - 933   2016.9

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    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   ROMBUNNO.15aPS‐43 - 2109   2016.9

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    日本物理学会講演概要集(CD-ROM)   70 ( 1 )   ROMBUNNO.22APS-59   2015.3

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    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   796 - 796   2015

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  • URu<sub>2</sub>Si<sub>2</sub>のフェルミ面研究

    摂待力生, 広瀬雄介, 土塔寛, 河野琢馬, 佐瀬芳行, 角田竜馬, 藤原万里子, 赤津光洋, 根本祐一, 本多史憲, 仲村愛, 本間佳哉, 李徳新, 青木大

    東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM)   32   103‐104   2015

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  • カゴ状化合物R<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>(R=La,Pr)の低温における熱膨張,磁気歪み

    矢尾優丞, 岩上欧史, 関口祐太, 南条知則, 阿部聡, 松本宏一, 阿野元貴, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, 北澤英明

    日本物理学会北陸支部定例学術講演会講演予稿集   2015   24   2015

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  • 21pPSA-45 Ultrasonic Study of Low Dimensional Antiferromagnet Cu_3Mo_2O_9 in Magnetic Fields

    Akatsu M, Oka K, Ito T, Eisaki H, Kogita T, Hayasaka C, Mitsumoto K, Nemoto Y, Goto T, Kuroe H, Sekine T, Hase M

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   1117 - 1117   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_1117

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  • 19aPS-41 Electric Quadrupole Effect in Iron Pnictide Superconductor Ba(Fe_<1-x>Co_x)_2As_2 and A15 superconductor V_3Si

    Kurihara R, Suzuki H, Onuki Y, Akatsu M, Mitsumoto K, Nemoto Y, Goto T, Kobayashi Y, Sato M, Settai R, Kaneko H

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   2135 - 2135   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_2135

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  • 16aPS-47 Ultrasonic Study of Two-Dimensional System Ba2CoGe2O7 in Magnetic Fields

    Ikesho H, Kawarai Y, Akatsu M, Mitsumoto K, Nemoto Y, Goto T, Soda M, Masuda T

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   752 - 752   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_752

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  • 17aPS-10 Ultrasonic measurements of elastic constants under hydrostatic pressure in CeRhIn_5

    Ito M, Mitsumoto K, Akatsu M, Nemoto Y, Goto T, Hirose Y, Settai R

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   1808 - 1808   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_1808

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  • 17aPS-52 Thermal Expansion and Magnetostriction Measurements in Clathrate Compound R_3Pd_<20>Ge_6 (R = La, Pr)

    Iwakami O, Goto T, Takeda N, Kitazawa H, Yao Y, Sekiguchi Y, Abe S, Matsumoto K, Ano G, Akatsu M, Mitsumoto K, Nemoto Y

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   1847 - 1847   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_1847

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  • 22aPS-121 Ultrasonic Study of LuAg_2In due to Quadrupole-Strain Interaction

    Mitsumoto K, Tanifuji Y, Akatsu M, Nemoto Y, Goto T, Suzuki H. S

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   2210 - 2210   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_2210

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  • 16aPS-48 Elastic Softening due to Quadrupole-Strain Interaction in Ba2Co2Ge2O7

    Mitsumoto K, Ikesho H, Kawarai Y, Akatsu M, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   753 - 753   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_753

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  • 22aPS-59 Ultrasonic study of hydrostatic pressure effects in YbCo_2Zn_<20>

    Nemoto Y, Hoshino K, Mitsumoto K, Akatsu M, Goto T, Hirose Y, Settai R, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   2151 - 2151   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_2151

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  • 超音波による重い電子カゴ状化合物YbCo<sub>2</sub>Zn<sub>20</sub>の静水圧効果 II

    星野和也, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 広瀬雄介, 摂待力生, 大貫惇睦

    日本物理学会講演概要集   69 ( 2 )   375   2014.8

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  • シリコン原子空孔軌道の強い四極子‐歪み結合による自発歪みと臨界濃度

    三本啓輔, 木村駿生, 赤津光洋, 根本祐一, 後藤輝孝

    日本物理学会講演概要集   69 ( 2 )   705 - 705   2014.8

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  • 超音波を用いた低次元反強磁性体Cu<sub>3</sub>Mo<sub>2</sub>O<sub>9</sub>の四極子効果の研究

    小木田拓巳, 赤津光洋, 早坂千明, 三本啓輔, 根本祐一, 後藤輝孝, 黒江晴彦, 関根智幸, 長谷正司, 岡邦彦, 伊藤利充, 永崎洋

    日本物理学会講演概要集   69 ( 2 )   260   2014.8

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  • 鉄ヒ素超伝導体Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub>における電気四極子揺らぎの緩和現象 II

    栗原綾佑, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 小林義明, 佐藤正俊

    日本物理学会講演概要集   69 ( 2 )   429 - 429   2014.8

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  • 希土類カゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の熱膨張・磁気歪み測定 II

    岩上欧史, 矢尾優丞, 関口祐太, 阿部聡, 松本宏一, 阿野元貴, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, 北澤英明

    日本物理学会講演概要集   69 ( 2 )   359   2014.8

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  • 超音波による低次元反強磁性体Cu<sub>3</sub>Mo<sub>2</sub>O<sub>9</sub>の弾性特性研究 II

    赤津光洋, 小木田拓巳, 早坂千明, 三本啓輔, 根本祐一, 後藤輝孝, 黒江晴彦, 関根智幸, 長谷正司, 岡邦彦, 伊藤利充, 永崎洋

    日本物理学会講演概要集   69 ( 2 )   294 - 294   2014.8

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  • 希土類カゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の熱膨張・磁気歪み測定

    岩上欧史, 浪指悠平, 矢尾優丞, 阿部聡, 松本宏一, 阿野元貴, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, 北澤英明

    日本物理学会講演概要集   69 ( 1 )   613   2014.3

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  • 鉄ヒ素超伝導体Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub>における電気四極子揺らぎの緩和現象

    栗原綾佑, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 小林義明, 佐藤正俊

    日本物理学会講演概要集   69 ( 1 )   572 - 572   2014.3

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  • 超音波表面弾性波によるボロン添加CZシリコンの原子空孔軌道の研究

    高須理栄, 馬場正太郎, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 金田寛, 古村雄二, 斉藤広幸, 鹿島一日兒, 斉藤芳彦

    日本物理学会講演概要集   69 ( 1 )   579 - 579   2014.3

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  • 半金属ビスマスの音響ドハース効果

    冠木悠太郎, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 伏屋雄紀

    日本物理学会講演概要集   69 ( 1 )   715 - 715   2014.3

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  • 三重項基底をもつ充填スクッテルダイト化合物PrRu<sub>4</sub>P<sub>12</sub>の超音波による超微細相互作用の研究

    大塚一輝, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 椎名亮輔, THALMEIER Peter

    日本物理学会講演概要集   69 ( 1 )   555 - 555   2014.3

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  • 超音波による低次元反強磁性体Cu<sub>3</sub>Mo<sub>2</sub>O<sub>9</sub>の弾性特性研究

    赤津光洋, 小木田拓巳, 早坂千明, 三本啓輔, 根本祐一, 後藤輝孝, 黒江晴彦, 関根智幸, 長谷正司, 岡邦彦, 伊藤利充, 永崎洋

    日本物理学会講演概要集   69 ( 1 )   513 - 513   2014.3

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  • 超音波によるA15超伝導体V<sub>3</sub>Siの四極子効果の研究

    野澤公義, 栗原綾佑, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 摂待力生, 金子浩, 鈴木治彦, 大貫惇睦

    日本物理学会講演概要集   69 ( 1 )   576 - 576   2014.3

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  • PrT<sub>2</sub>Zn<sub>20</sub>(T=Ir,Rh)における磁場誘起相転移の相境界

    石井勲, 上川修平, 野口慈仁, 後藤弘季, 藤田貴弘, 鬼丸孝博, 松本圭介, 高畠敏郎, 赤津光洋, 根本祐一, 後藤輝孝, 鈴木孝至

    日本物理学会講演概要集   69 ( 1 )   556 - 556   2014.3

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  • PrAg<sub>2</sub>In純良単結晶における極低温比熱・磁化測定 II

    佐藤由昌, 古谷圭一, 諸富大樹, 河江達也, 鈴木博之, 大塚一輝, 根本祐一

    日本物理学会講演概要集   69 ( 1 )   549 - 549   2014.3

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  • ルテニウム酸化物超伝導体Sr<sub>2</sub>RuO<sub>4</sub>の電気四極子効果

    矢尾板俊輔, 栗原綾佑, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 吉田良行

    日本物理学会講演概要集   69 ( 1 )   619 - 619   2014.3

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  • 超音波による重い電子カゴ状化合物YbCo<sub>2</sub>Zn<sub>20</sub>の静水圧効果

    根本祐一, 星野和也, 三本啓輔, 赤津光洋, 後藤輝孝, 広瀬雄介, 摂待力生, 大貫惇睦

    日本物理学会講演概要集   69 ( 1 )   659   2014.3

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  • 超低温における希土類カゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の熱膨張測定

    岩上欧史, 矢尾優丞, 関口祐太, 阿部聡, 松本宏一, 阿野元貴, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, 北澤英明

    日本物理学会北陸支部定例学術講演会講演予稿集   2014   37   2014

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  • 27pBE-8 Ultrasonic Study of Hyperfine Interaction on Filled Skutterudite PrRu_4P_<12>

    Otsuka K, Mitsumoto K, Akatsu M, Nemoto Y, Goto T, Takeda N, Shiina R, Thalmeier Peter

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   555 - 555   2014

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  • 27pBE-13 Phase boundary of the magnetic-field-induced phase transition in PrT_2Zn_<20>(T=Ir, Rh)

    Ishii I, Nemoto Y, Goto T, Suzuki T, Kamikawa S, Noguchi Y, Goto H, Fujita T. K, Onimaru T, Matsumoto K. T, Takabatake T, Akatsu M

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   556 - 556   2014

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  • 27pPSA-41 Relaxation Phenomena of Electric Quadrupole Fluctuation in Iron Pnictide Superconductor Ba(Fe_<1-x>Co_x)_2As_2

    Kurihara R, Akatsu M, Mitsumoto K, Nemoto Y, Goto T, Kobayashi Y, Sato M

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   572 - 572   2014

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  • 28aAY-5 Ultrasonic Study of Elastic Properties of Low Dimensional Antiferromagnet Cu_3Mo_2O_9

    Akatsu M, Oka K, Ito T, Eisaki H, Kogita T, Hayasaka C, Mitsumoto K, Nemoto Y, Goto T, Kuroe H, Sekine T, Hase M

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   513 - 513   2014

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  • 28aPS-73 Ultrasonic Investigation of Rattling in Caged Compounds RRu_2Zn_<20> (R=La, Sm)

    Takahashi M., Akatsu M., Mitsumoto K., Nemoto Y., Goto T., Sasahara T., Nakano T., Takeda N., Ishii I.

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   610 - 610   2014

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    DOI: 10.11316/jpsgaiyo.69.1.3.0_610_2

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  • 28aPS-73 Ultrasonic Investigation of Rattling in Caged Compounds RRu_2Zn_<20> (R=La, Sm)

    Takahashi M., Akatsu M., Mitsumoto K., Nemoto Y., Goto T., Sasahara T., Nakano T., Takeda N., Ishii I.

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   610 - 610   2014

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    DOI: 10.11316/jpsgaiyo.69.1.3.0_610_2

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  • 28aPS-88 Thermal Expansion and Magnetostriction Measurements of Clathrate Compound Pr_3Pd_<20>Ge_6

    Iwakami O, Goto T, Takeda N, Kitazawa H, Namisashi Y, Yao Y, Abe S, Matsumoto K, Ano G, Akatsu M, Mitsumoto K, Nemoto Y

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   613 - 613   2014

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  • 8aPS-79 Ultrasonic Study of Hydrostatic Pressure Effects in YbCo_2Zn_<20> II

    Hoshino K, Mitsumoto K, Akatsu M, Nemoto Y, Goto T, Hirose Y, Settai R, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   375 - 375   2014

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  • 9aPS-114 Relaxation Phenomena of Electric Quadrupole Fluctuation in Iron Pnictide Superconductor Ba(Fe_<1-x>Co_x)_2As_2 II

    Kurihara R, Akatsu M, Mitsumoto K, Nemoto Y, Goto T, Kobayashi Y, Sato M

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   429 - 429   2014

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  • 8aPS-10 Thermal Expansion and Magnetostriction Measurements of Clathrate Compound Pr_3Pd_<20>Ge_6

    Iwakami O, Goto T, Takeda N, Kitazawa H, Yao Y, Sekiguchi Y, Abe S, Matsumoto K, Ano G, Akatsu M, Mitsumoto K, Nemoto Y

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   359 - 359   2014

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  • 27pPSA-58 Ultrasonic Study of Quadrupole Effect in A15 Superconductor V_3Si

    Nozawa Masayoshi, Onuki Yoshichika, Kurihara Ryousuke, Akatsu Mitsuhiro, Mitsumoto Keisuke, Nemoto Yuichi, Goto Terutaka, Settai Rikio, Kaneko Hiroshi, Suzuki Haruhiko

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   576 - 576   2014

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  • 7aPS-123 Ultrasonic Investigation of Quadrupole Effects in Low-Dimensional Antiferromagnet Cu_3Mo_2O_9

    Kogita T, Oka K, Ito T, Eisaki H, Akatsu M, Hayasaka C, Mitsumoto K, Nemoto Y, Goto T, Kuroe H, Sekine T, Hase M

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   260 - 260   2014

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  • 8pBC-5 Ultrasonic Study of Elastic Properties of Low Dimensional Antiferromagnet Cu_3Mo_2O_9 II

    Akatsu M, Oka K, Ito T, Eisaki H, Kogita T, Hayasaka C, Mitsumoto K, Nemoto Y, Goto T, Kuroe H, Sekine T, Hase M

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   294 - 294   2014

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  • 28pPSA-12 Acoustic de Haas-van Alphen Effect in a Semimetal Bismuth

    Kabuki Y, Mitsumoto K, Akatsu M, Nemoto Y, Goto T, Fuseya Y

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   715 - 715   2014

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  • 10aAE-2 Spontaneous distortion and critical concentration due to strong quadrupole-strain interaction of vacancy orbital in silicon crystal

    Mitsumoto K, Kimura T, Akatsu M, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   705 - 705   2014

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  • 28aPS-115 Electric Quadrupole Effect of Ruthenate Superconductor Sr_2RuO_4

    Yaoita S, Kurihara R, Akatsu M, Mitsumoto K, Nemoto Y, Goto T, Yoshida Y

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   619 - 619   2014

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  • 29pCM-1 Ultrasonic study of hydrostatic pressure effects in YbCo_2Zn_<20>

    Nemoto Y, Hoshino K, Mitsumoto K, Akatsu M, Goto T, Hirose Y, Settai R, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   659 - 659   2014

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  • 27pPSA-72 Observation of Vacancy Orbital in Boron-Doped CZ Silicon by Using Surface Acoustic Wave

    Takasu Rie, Kashima Kazuhiko, Saito Yoshihiko, Baba Shotaro, Mitsumoto Keisuke, Akatsu Mitsuhiro, Nemoto Yuichi, Goto Terutaka, Yamada-Kaneta Hiroshi, Furumura Yuuji, Saito Hiroyuki

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   579 - 579   2014

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  • Strong Quadrupole-Strain Interaction of Vacancy Orbital in Boron-Doped Czochralski Silicon

    Kazuki Okabe, Mitsuhiro Akatsu, Shotaro Baba, Keisuke Mitsumoto, Yuichi Nemoto, Hiroshi Yamada-Kaneta, Terutaka Goto, Hiroyuki Saito, Kazuhiko Kashima, Yoshihiko Saito

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   82 ( 12 )   2013.12

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    We have carried out ultrasonic measurements of a boron-doped silicon ingot grown by the Czochralski method in order to determine the quadrupole-strain interaction constant of a vacancy orbital. The low-temperature softening of the elastic constant C-44 shows a remarkable variation depending on positions of the ingot, which reflects the distribution of vacancy concentration N in the ingot. An infrared laser scattering tomograph was employed to measure the density and size of voids in the silicon wafers by determining the vacancy concentration N-cons consumed in void formation. Using a combination of laser scattering tomography and low-temperature softening, we have found a sum rule in which the initially created vacancy concentration N-total corresponds to the sum of the residual vacancy concentration N and the consumed vacancy concentration N-cons as N-total N + N-cons. Taking account of the sum rule, we deduce the interaction constant g(Gamma 5) = (2.8 +/- 0.2) x 10(5) K for the quadrupole-strain interaction H-QS = -g(Gamma 5)O(zx)epsilon(zx) of the vacancy orbital. The huge deformation energy of 1.6 x 10(5) K per vacancy with the Gamma(8) ground state for unit strain epsilon(zx) = 1 verified the strong electron-lattice interaction of the vacancy orbital. Employing the one-to-one correspondence between the softening of Delta C-44/C-44 = 1.0 x 10(-4) down to 30 mK and the vacancy concentration of N = 1.5 x 10(13) cm(-3), we can determine the vacancy concentration by low-temperature ultrasonic measurements. The present work surely puts forward a novel semiconductor technology based on low-temperature ultrasonic measurements for evaluating vacancy concentration in silicon wafers.

    DOI: 10.7566/JPSJ.82.124604

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  • 静水圧下超音波計測による重い電子系カゴ状化合物YbCo<sub>2</sub>Zn<sub>20</sub>の研究

    星野和也, 根本祐一, 後藤輝孝, 赤津光洋, 広瀬雄介, 摂待力生, 大貫惇睦

    高圧討論会講演要旨集   54th   190   2013.10

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  • 低温超音波測定と2次欠陥測定によるCZシリコン結晶中の原子空孔評価(1)弾性定数のソフト化とボイド欠陥の相関

    斎藤広幸, 岡部和樹, 鹿島一日兒, 金田寛, 斉藤芳彦, 根本祐一, 後藤輝孝

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   74th   ROMBUNNO.16P-B2-4   2013.8

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  • 低温超音波測定と2次欠陥測定によるCZシリコン結晶中の原子空孔評価(3)空孔数総和側と隠されたBMD

    金田寛, 斎藤広幸, 岡部和樹, 鹿島一日兒, 斉藤芳彦, 根本祐一, 後藤輝孝

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   74th   ROMBUNNO.16P-B2-6   2013.8

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  • 低温超音波測定と2次欠陥測定によるCZシリコン結晶中の原子空孔評価(2)原子空孔とBMD密度の相関

    岡部和樹, 斎藤広幸, 鹿島一日兒, 金田寛, 斉藤芳彦, 根本祐一, 後藤輝孝

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   74th   ROMBUNNO.16P-B2-5   2013.8

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  • シリコンウェーハの原子空孔軌道の巨大な四極子‐歪み相互作用

    後藤輝孝, 三本啓輔, 赤津光洋, 馬場正太郎, 高須理恵, 岡部和樹, 根本祐一, 金田寛, 斎藤広幸, 鹿島一日兒, 斉藤芳彦

    日本物理学会講演概要集   68 ( 2 )   444 - 444   2013.8

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  • 擬一次元スピン系BaCo<sub>2</sub>V<sub>2</sub>O<sub>8</sub>の強磁場弾性特性

    赤津光洋, 早坂千明, 三本啓輔, 根本祐一, 後藤輝孝, YASIN Shadi, ZHERLITSYN Sergei, WOSNITZA Joachim, Zeitler Uli, 大村公美子, 山口博則, 木村尚次郎, 萩原政幸

    日本物理学会講演概要集   68 ( 2 )   432 - 432   2013.8

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  • 鉄ヒ素超伝導体Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub>における電気四極子揺らぎの臨界減速

    栗原綾佑, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 小林義明, 佐藤正俊

    日本物理学会講演概要集   68 ( 2 )   574 - 574   2013.8

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  • 超音波によるPr化合物の四極子超微細相互作用の研究

    根本祐一, 西方丈智, 大塚一輝, 三本啓輔, 赤津光洋, 後藤輝孝, 鈴木博之, 椎名亮輔, THALMEIER P

    日本物理学会講演概要集   68 ( 2 )   443 - 443   2013.8

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  • PrIr<sub>2</sub>Zn<sub>20</sub>の磁場誘起相転移における弾性異常

    石井勲, 宗重仁士, 上川修平, 野口慈仁, 藤田貴弘, 鬼丸孝博, 松本圭介, 長澤直裕, 高畠敏郎, 阿野元貴, 大塚一輝, 赤津光洋, 根本祐一, 後藤輝孝, 鈴木孝至

    日本物理学会講演概要集   68 ( 1 )   585   2013.3

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  • Elastic Properties of Quasi One Dimensional System BaCo_2V_2O_8 under High Magnetic Field

    Akatsu M, Omura K, Yamaguchi H, Kimura S, Hagiwara M, Hayasaka C, Mitsumoto K, Nemoto Y, Goto T, Yasin Shadi, Zherlitsyn Sergei, Wosnitza Joachim, Zeitler Uli

    Meeting Abstracts of the Physical Society of Japan   68 ( 0 )   432 - 432   2013

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  • Ultrasonic study of quadrupole hyperfine interaction in Pr based compounds

    Nemoto Y, Nishikata T, Otsuka K, Mitsumoto K, Akatsu M, Goto T, Suzuki H.S, Shiina R, Thalmeier P

    Meeting Abstracts of the Physical Society of Japan   68 ( 0 )   443 - 443   2013

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  • Critical Slowing Down of Electric Quadrupole Fluctuation in Iron Pnictide Superconductor Ba(Fe_<1-x>Co_x)_2As_2

    Kurihara R, Akatsu M, Mitsumoto K, Nemoto Y, Goto T, Kobayashi Y, Sato M

    Meeting Abstracts of the Physical Society of Japan   68 ( 0 )   574 - 574   2013

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  • 26pXT-9 Elastic anomalies at the magnetic-field-induced phase transition in PrIr_2Zn_<20>

    Ishii I, Ano G, Otsuka K, Akatsu M, Nemoto Y, Goto T, Suzuki T, Muneshige H, Kamikawa S, Noguchi Y, Fujita T. K, Onimaru T, Matsumoto K. T, Nagasawa N, Takabatake T

    Meeting Abstracts of the Physical Society of Japan   68 ( 0 )   585 - 585   2013

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  • 希土類カゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の交流帯磁率測定 II

    岩上欧史, 浪指悠平, 阿部聡, 松本宏一, 阿野元貴, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, 北澤英明

    日本物理学会北陸支部定例学術講演会講演予稿集   2013   44   2013

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  • 超音波によるPrFe<sub>4</sub>P<sub>12</sub>の結晶場と多極子秩序の解明

    根本祐一, 池田佳生, 三本啓輔, 赤津光洋, 阿野元貴, 荒木幸治, 後藤輝孝, 黒瀧直哉, 中野智仁, 武田直也

    日本物理学会講演概要集   67 ( 2 )   493   2012.8

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  • 超音波による鉄ヒ素超伝導体Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub>の電気四極子効果

    栗原綾佑, 荒木幸治, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 小林義明, 佐藤正俊

    日本物理学会講演概要集   67 ( 2 )   559 - 559   2012.8

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  • カゴ状化合物PrRh<sub>2</sub>Zn<sub>20</sub>の磁場中弾性率

    宗重仁士, 石井勲, 上川修平, 末富靖彦, 藤田貴弘, 鬼丸孝博, 長澤直裕, 高畠敏郎, 阿野元貴, 赤津光洋, 根本祐一, 後藤輝孝, 鈴木孝至

    日本物理学会講演概要集   67 ( 2 )   521   2012.8

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  • 超低温における希土類カゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の交流帯磁率測定

    岩上欧史, 浪指悠平, 阿部聡, 松本宏一, 阿野元貴, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 武田真也, 北澤英明

    日本物理学会講演概要集   67 ( 2 )   747   2012.8

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  • 超音波による正方晶化合物YbCu<sub>2</sub>Si<sub>2</sub>の価数揺動状態の研究

    西方丈智, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 摂待力生, 大貫惇睦

    日本物理学会講演概要集   67 ( 2 )   526 - 526   2012.8

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  • 超音波によるカゴ状化合物YbCo<sub>2</sub>Zn<sub>20</sub>の多極子の研究

    大井友貴, 三本啓輔, 阿野元貴, 赤津光洋, 根本祐一, 後藤輝孝, 摂待力生, 大貫惇睦

    日本物理学会講演概要集   67 ( 2 )   579   2012.8

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  • 非クラマース二重項基底を持つPrMg<sub>3</sub>の極低温磁化

    荒木幸治, 榊原俊郎, 志村恭通, 後藤輝孝, 根本祐一, 赤津光洋, 三木啓輔, 三木啓輔, 鈴木博之, 谷田博司, 高木滋, YASIN Shadi, ZHERLITSYN Sergei, WOSNITZA Joachim

    日本物理学会講演概要集   67 ( 2 )   523 - 523   2012.8

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  • PrMg<sub>3</sub>の非クラマース二重項と格子の結合による散逸量子状態

    荒木幸治, 後藤輝孝, 三本啓輔, 根本祐一, 赤津光洋, 鈴木博之, 谷田博司, 高木滋, YASIN Shadi, ZHERLITSYN Sergei, WOSNITZA Joachim

    日本物理学会講演概要集   67 ( 1 )   653 - 653   2012.3

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  • YbCo<sub>2</sub>Zn<sub>20</sub>の四極子効果による弾性ソフト化

    三本啓輔, 大井友貴, 阿野元貴, 赤津光洋, 根本祐一, 後藤輝孝, 摂待力生, 大貫惇睦

    日本物理学会講演概要集   67 ( 1 )   680   2012.3

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  • 擬スピン一次元系BaCo<sub>2</sub>V<sub>2</sub>O<sub>8</sub>の弾性ソフト化

    赤津光洋, 早坂千明, 三本啓輔, 荒木幸治, 根本祐一, 奥西巧一, 後藤輝孝, 大村公美子, 山口博則, 木村尚次郎, 萩原政幸

    日本物理学会講演概要集   67 ( 1 )   491   2012.3

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  • PrRh<sub>2</sub>Zn<sub>20</sub>の弾性率

    石井勲, 宗重仁士, 上川修平, 末冨靖彦, 藤田貴弘, 鬼丸孝博, 長澤直裕, 高畠敏郎, 阿野元貴, 赤津光洋, 根本祐一, 後藤輝孝, 鈴木孝至

    日本物理学会講演概要集   67 ( 1 )   663   2012.3

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  • 鉄ヒ素超伝導体Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub>における電気四極子揺らぎ

    栗原綾佑, 荒木幸治, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 小林義明, 佐藤正俊

    日本物理学会講演概要集   67 ( 1 )   557 - 557   2012.3

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  • 希土類カゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の交流帯磁率測定

    岩上欧史, 浪指悠平, 阿部聡, 松本宏一, 阿野元貴, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, 北澤英明

    日本物理学会講演概要集   67 ( 1 )   655   2012.3

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  • SmOs<sub>4</sub>Sb<sub>12</sub>の強磁場下に於ける弾性応答

    柳澤達也, 門別翔太, 日高宏之, 網塚浩, 赤津光洋, 根本祐一, 後藤輝孝, YASHIN S, ZHERLITSYN S, WOSNITZA J

    日本物理学会講演概要集   67 ( 1 )   559   2012.3

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  • パルス磁場を用いたSmOs<sub>4</sub>Sb<sub>12</sub>の超音波測定

    門別翔太, 柳澤達也, 日高宏之, 網塚浩, 赤津光洋, 根本祐一, 後藤輝孝, YASHIN S, ZHERLITSYN S, WOSNITZA J

    日本物理学会講演概要集   67 ( 1 )   649   2012.3

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  • 25pPSB-37 Dissipative Quantum State due to Coupling of Non-Kramers Doublet to Lattice Vibrations in PrMg

    Araki K, Zherlitsyn Sergei, Wosnitza Joachim, Goto T, Mitsumoto K, Nemoto Y, Akatsu M, Suzuki H. S, Tanida H, Takagi S, Yasin Shadi

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   653 - 653   2012

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    DOI: 10.1143/JPSJ.81.023710

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  • 24pYA-11 Quadrupole fluctuation in iron pnictide superconductor Ba(Fe_<1-x>Co_x)_2As_2

    Kurihara R, Araki K, Mitsumoto K, Akatsu M, Nemoto Y, Goto T, Kobayashi Y, Sato. M

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   557 - 557   2012

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  • 21aFH-7 Multipole Effects of YbCo_2Zn_<20> Using Ultrasonic Measurements

    Oi Y, Mitsumoto K, Ano G, Akatsu M, Nemoto Y, Goto T, Settai R, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   579 - 579   2012

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  • 21aAD-8 Temperature dependence of AC susceptibility of clathrate compound Pr_3Pd_<20>Ge_6

    Iwakami O, Takeda N, Kitazawa H, Namisashi Y, Abe S, Matsumoto K, Ano G, Akatsu M, Mitsumoto K, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   747 - 747   2012

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  • 20pPSB-13 Quadrupole Effect in Iron Pnictide Superconductor Ba(Fe_<1-x>Co_x)_2As_2 Using Ultrasonic Methods

    Kurihara R, Araki K, Mitsumoto K, Akatsu M, Nemoto Y, Goto T, Kobayashi Y, Sato M

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   559 - 559   2012

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  • 20aPSA-70 Low-Temperature Magnetization of PrMg_3 with Non-Kramers Doublet Ground State

    Araki K, Takagi S, Yasin Shadi, Zherlitsyn Sergei, Wosnitza Joachim, Sakakibara T, Shimura Y, Goto T, Nemoto Y, Akatsu M, Mitsumoto K, Suzuki H. S, Tanida H

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   523 - 523   2012

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  • 20aPSB-10 Study of Valence Fluctuation State of the Tetragonal Compound YbCu_2Si_2 Using Ultrasonic Measurements

    Nishikata T, Mitsumoto K, Akatsu M, Nemoto Y, Goto T, Setai R, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   526 - 526   2012

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  • 19pHC-11 Ultrasonic Investigation of Crystal Field Levels and Multipolar Ordering in PrFe_4P_<12>

    Nemoto Y., Takeda N., Ikeda Y., Mitsumoto K., Akatsu M., Ano G., Araki K., Goto T., Kurotaki N., Nakano T.

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   493 - 493   2012

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    DOI: 10.11316/jpsgaiyo.67.2.3.0_493_2

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  • 20aPSA-62 Elastic Moduli under magnetic fields in the Cage Compound PrRh_2Zn_<20>

    Muneshige H, Akatsu M, Nemoto Y, Goto T, Suzuki T, Ishii I, Kamikawa S, Suetomi Y, Fujita T. K, Onimaru T, Nagasawa N, Takabatake T, Ano G

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   521 - 521   2012

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  • 26pYA-8 Elastic moluli of PrRh_2Zn_<20>

    Ishii I, Akatsu M, Nemoto Y, Goto T, Suzuki T, Muneshige H, Kamikawa S, Suetomi Y, Fujita T.K, Onimaru T, Nagasawa N, Takabatake T, Ano G

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   663 - 663   2012

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  • 27aYB-3 Elastic Softening due to Quadrupole Effects in YbCo_2Zn_<20>

    Mitsumoto K, Oi Y, Ano G, Akatsu M, Nemoto Y, Goto T, Settai R, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   680 - 680   2012

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  • 25pPSB-19 Ultrasonic Measurement of SmOs_4Sb_<12> with Pulse Magnetic Field

    Mombetsu S, Wosnitza J, Yanagisawa T, Hidaka H, Amitsuka H, Akatsu M, Nemoto Y, Goto T, Yashin S, Zherlitsyn S

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   649 - 649   2012

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  • 25pPSB-47 Temperature dependence of AC susceptibility of clathrate compound Pr_3Pd_<20>Ge_6

    Iwakami O, Takeda N, Kitazawa H, Namisashi Y, Abe S, Matumoto K, Ano G, Akatu M, Mitsumoto K, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   655 - 655   2012

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  • 24pYB-6 Elastic Response of SmOs_4Sb_<12> under High Magnetic Field

    Yanagisawa T, Wosnitza J, Mombetsu S, Hidaka H, Amitsuka H, Akatsu M, Nemoto Y, Goto T, Yashin S, Zherlitsyn S

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   559 - 559   2012

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  • 24aPS-69 Elastic Softening on Quasi One Dimensional System BaCo_2V_2O_8

    Akatsu M, Kimura S, Hagiwara M, Hayasaka C, Mitsumoto K, Araki K, Nemoto Y, Okunishi K, Goto T, Omura K, Yamaguchi H

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   491 - 491   2012

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  • 超低温におけるシリコンの超音波測定 II

    天満屋拓美, 浪指悠平, 岩上欧史, 松本宏一, 阿部聡, 赤津光洋, 馬場正太郎, 三本啓輔, 金田寛, 根本祐一, 後藤輝孝

    日本物理学会北陸支部定例学術講演会講演予稿集   2012   14   2012

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  • 磁場中超音波計測によるHoRh<sub>2</sub>Si<sub>2</sub>の四極子効果

    三本啓輔, 小池達哉, 赤津光洋, 根本祐一, 後藤輝孝, 繁岡透

    日本物理学会講演概要集   66 ( 2 )   477 - 477   2011.8

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  • 希土類六放課物Ce<sub>x</sub>La<sub>1-x</sub>B<sub>6</sub>の一軸圧四極子効果 II

    赤津光洋, 倉上慶大, 根本祐一, 後藤輝孝, 国井暁

    日本物理学会講演概要集   66 ( 2 )   477   2011.8

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  • ボロン添加シリコンの原子空孔軌道と横波弾性定数C<sub>44</sub>の異方的な磁場依存性

    馬場正太郎, 赤津光洋, 三本啓輔, 小松悟, 堀江邦彦, 根本祐一, 金田寛, 後藤輝孝

    日本物理学会講演概要集   66 ( 2 )   980   2011.8

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  • SmOs<sub>4</sub>Sb<sub>12</sub>の音響ドハース・ファンアルフェン効果

    柳澤達也, 門別翔太, 日高宏之, 網塚浩, 赤津光洋, 荒木幸治, 根本祐一, 後藤輝孝, HO Pei‐Chun, BAUMBACH Ryan E, MAPLE M. Brian

    日本物理学会講演概要集   66 ( 2 )   596   2011.8

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  • 希土類化合物Ce<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の近藤効果 II

    阿野元貴, 藤田雅也, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 小野宏基, 武田直也, 酒井治, DOENNI Andreas, 北澤英明

    日本物理学会講演概要集   66 ( 2 )   650   2011.8

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  • PrIr<sub>2</sub>Zn<sub>20</sub>の反強四極子秩序

    石井勲, 宗重仁士, 末冨靖彦, 藤田貴弘, 鬼丸孝博, 松本圭介, 高畠敏郎, 荒木幸治, 赤津光洋, 根本祐一, 後藤輝孝, 鈴木孝至

    日本物理学会講演概要集   66 ( 2 )   648   2011.8

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  • 超音波を用いた鉄ヒ素超伝導体Ba(Fe<sub>0.9</sub>Co<sub>0.1</sub>)<sub>2</sub>As<sub>2</sub>の四極子効果の研究

    栗原綾佑, 後藤輝孝, 荒木幸治, 三本啓輔, 赤津光洋, 根本祐一, 立松峻一, 佐藤正俊

    日本物理学会講演概要集   66 ( 2 )   562   2011.8

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  • 中性子非弾性散乱法によるカゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の結晶場準位の決定 II

    北澤英明, DOENNI Andreas, STRAESSLE Thierry, KELLER Lukas, 松田雅昌, 加倉井和久, 阿野元貴, 赤津光洋, 根本祐一, 後藤輝孝

    日本物理学会講演概要集   66 ( 2 )   649 - 649   2011.8

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  • 超音波計測によるBa(Fe<sub>0.9</sub>Co<sub>0.1</sub>)<sub>2</sub>As<sub>2</sub>の四極子揺らぎの研究

    三本啓輔, 栗原綾祐, 荒木幸治, 赤津光洋, 根本祐一, 後藤輝孝, 立松峻一, 佐藤正俊

    物性研究   96 ( 5 )   572 - 572   2011.8

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  • 一軸圧超音波計測を用いたCe<sub>x</sub>La<sub>1-x</sub>B<sub>6</sub>の四極子効果の研究

    倉上慶太, 赤津光洋, 根本祐一, 後藤輝孝, 国井暁

    日本物理学会講演概要集   66 ( 1 )   539   2011.3

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  • 横波超音波計測によるボロン添加シリコンの原子空孔軌道の研究

    小松悟, 馬場正太郎, 堀江邦彦, 赤津光洋, 三本啓輔, 小川貴史, 根本祐一, 金田寛, 後藤輝孝

    日本物理学会講演概要集   66 ( 1 )   628 - 628   2011.3

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  • ボロン添加シリコンの原子空孔軌道と横波弾性定数C<sub>44</sub>の磁場依存性

    馬場正太郎, 赤津光洋, 小松悟, 堀江邦彦, 三本啓輔, 根本祐一, 金田寛, 後藤輝孝

    日本物理学会講演概要集   66 ( 1 )   555   2011.3

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  • 超音波によるCe<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の近藤効果の研究

    松尾一穂, 藤田雅也, 阿野元貴, 荒木幸治, 立川喜章, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 酒井治, DOENNI Andreas, 北澤英明

    日本物理学会講演概要集   66 ( 1 )   540   2011.3

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  • Ho<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の四極子効果の研究

    藤田雅也, 松尾一穂, 阿野元貴, 立川喜章, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, DOENNI Andreas, 北澤英明

    日本物理学会講演概要集   66 ( 1 )   540   2011.3

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  • 希土類正方晶化合物HoRh<sub>2</sub>Si<sub>2</sub>の四極子効果

    小池達哉, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 繁岡透

    日本物理学会講演概要集   66 ( 1 )   539 - 539   2011.3

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  • 立方晶PrCu<sub>4</sub>Agの磁場中超音波測定

    ZHANG S, 石川義和, 赤津光洋, 高橋直紀, 荒木幸治, 根本祐一, 後藤輝孝

    日本物理学会講演概要集   66 ( 1 )   678 - 678   2011.3

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  • 希土類化合物Ce<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の近藤効果

    阿野元貴, 松尾一穂, 藤田雅也, 荒木幸治, 立川喜章, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 酒井治, DOENNI Andreas, 北澤英明

    日本物理学会講演概要集   66 ( 1 )   550   2011.3

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  • 中性子非弾性散乱法によるカゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の結晶場準位の決定

    北澤英明, DOENNI Andreas, STRAESSLE Thierry, KELLER Lukas, 松田雅昌, 加倉井和久, 阿野元貴, 赤津光洋, 根本祐一, 後藤輝孝

    日本物理学会講演概要集   66 ( 1 )   379   2011.3

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  • 超音波による鉄系砒素超伝導Ba(Fe<sub>0.9</sub>Co<sub>0.1</sub>)<sub>2</sub>As<sub>2</sub>の軌道揺らぎの研究

    後藤輝孝, 栗原綾佑, 荒木幸治, 赤津光洋, 三本啓輔, 根本祐一, 立松峻一, 佐藤正俊

    日本物理学会講演概要集   66 ( 1 )   589   2011.3

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  • DFT計算によるシリコン単原子空孔のスピン軌道相互作用の検討

    小川貴史, 鶴田健二, 家富洋, 根本祐一, 金田寛, 後藤輝孝

    日本物理学会講演概要集   66 ( 1 )   979 - 979   2011.3

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  • 超音波計測によるTmAg<sub>2</sub>Inの四極子効果の研究

    谷野龍慈, 荒木幸治, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 鈴木博之, 高木滋

    日本物理学会講演概要集   66 ( 1 )   541 - 541   2011.3

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  • 希土類六硼化物Ce<sub>x</sub>La<sub>1-x</sub>B<sub>6</sub>の一軸圧四極子効果

    赤津光洋, 倉上慶大, 根本祐一, 後藤輝孝, 国井暁

    日本物理学会講演概要集   66 ( 1 )   660   2011.3

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  • Sm<sub>1-x</sub>La<sub>x</sub>Sn<sub>3</sub>の弾性的性質

    森田憲吾, 細矢信吾, 橋尾範, 田巻明, 赤津光洋, 根本祐一, 後藤輝孝, 鈴木博之, 北澤英明

    日本物理学会講演概要集   66 ( 1 )   542   2011.3

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  • 低温超音波測定によるHoRh<sub>2</sub>Si<sub>2</sub>の四極子効果

    三本啓輔, 小池達哉, 赤津光洋, 根本祐一, 後藤輝孝, 繁岡透

    日本物理学会講演概要集   66 ( 1 )   678 - 678   2011.3

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  • 希土類カゴ状化合物Nd<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の四極子効果とラットリングの研究

    戸谷田貴志, 阿野元貴, 荒木幸治, 立川喜章, 赤津光洋, 根本祐一, 後藤輝孝, 北澤英明

    日本物理学会講演概要集   66 ( 1 )   540   2011.3

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  • CePd<sub>3</sub>S<sub>4</sub>の四極子秩序

    高橋直樹, 荒木幸治, 赤津光洋, 根本祐一, 後藤輝孝, 松岡英一, 綿引正倫, 谷垣勝己, 小野寺秀也

    日本物理学会講演概要集   66 ( 1 )   542   2011.3

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  • 超音波によるPrFe<sub>4</sub>P<sub>12</sub>の四極子効果

    池田佳生, 西方丈智, 阿野元貴, 赤津光洋, 根本祐一, 後藤輝孝, 黒瀧直哉, 武田直也

    日本物理学会講演概要集   66 ( 1 )   653   2011.3

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  • 希土類カゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の交流帯磁率測定

    岩上欧史, 浪指悠平, 松本宏一, 阿部聡, 阿野元貴, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, 北澤英明

    日本物理学会北陸支部定例学術講演会講演予稿集   2011   27   2011

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  • 28pEC-5 Determination of crystal-field diagrams for clathrate compound Pr_3Pd_<20>Si_6 by inelastic neutron scattering measurements

    Kitazawa H, Goto T, Donni Andreas, Strassle Thierry, Keller Lukas, Matsuda M, Kakurai K, Ano G, Akatsu M, Nemoto Y

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   679 - 679   2011

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  • 28pEC-2 Ultrasonic measurement on cubic PrCu_4Ag in magnetic field

    Zhang S, Isikawa Y, Akatsu M, Takahashi N, Araki K, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   678 - 678   2011

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  • 28pEC-3 Quadropole Effect in Rare Earth Tetragonal Compound HoRh_2Si_2

    Mitsumoto K, Koike T, Akatsu M, Nemoto Y, Goto T, Sigeoka T

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   678 - 678   2011

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  • 27pPSB-15 Ultrasonic study of Quadrupole Effect in Filled PeFe_4P_<12>

    Ikeda Y, Nishikata T, Ano G, Akatu M, Nemoto Y, Goto T, Kurotaki N, Takeda N

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   653 - 653   2011

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  • 28aEC-6 Quadrupole Effect on Ce_xLa_<1-x>B_6 under Uniaxial Pressure

    Akatsu M, Kurakami K, Nemoto Y, Goto T, Kunii S

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   660 - 660   2011

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  • 26aEE-11 Ultrasonic investigation on iron pnictide superconductar Ba(Fe_<0.9>Co_<0.1>)_2As_2

    Goto T, Kurihara R, Araki K, Akatsu M, Mitsumoto K, Nemoto Y, Tatematsu S, Sato M

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   589 - 589   2011

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  • 26pPSA-46 Study of vacancy of orbital in B-doped FZ Silicon using by transverse wave ultrasonic measurements

    Komatsu Satoru, Baba Shotaro, Akatsu Mitsuhiro, Mitsumoto Keisuke, Ogawa Takafumi, Nemoto Yuichi, Yamada-Kaneta Hiroshi, Goto Terutaka

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   628 - 628   2011

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  • 25aPS-122 Elastic properties of Sm_<1-x>La_xSn_3

    Morita K, Hosoya S, Hashio S, Tamaki A, Akatsu M, Nemoto Y, Goto T, Suzuki H, Kitazawa H

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   542 - 542   2011

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  • 25pEC-6 Kondo Effect in Rare-earth Compound Ce_3Pd_<20>Si_6

    Ano G, Takeda N, Sakai O, Donni Andreas, Kitazawa H, Matsuo K, Fujita M, Araki K, Tachikawa Y, Mitsumoto K, Akatsu M, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   550 - 550   2011

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  • 25aPS-120 Quadrupolar Ordering of CePd_3S_4

    Takahashi N, Araki K, Akatsu M, Nemoto Y, Goto T, Matsuoka E, Watahiki M, Tanigaki K, Onodera H

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   542 - 542   2011

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  • 25pED-13 Vacancy orbital and magnetic field dependence of transverse elastic constant C_<44> in boron-doped silicon

    Baba Shotaro, Akatsu Mitsuhiro, Komatsu Satoru, Horie Kunihiko, Mitsumoto Keisuke, Nemoto Yuichi, Yamada-Kaneta Hiroshi, Goto Terutaka

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   555 - 555   2011

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  • 22aGQ-7 Vacancy orbital and anisotropic magnetic field dependence of transverse elastic constant C_<44> in boron-doped silicon

    Baba Shotaro, Akatsu Mitsuhiro, Mitsumoto Keisuke, Komatsu Satoru, Horie Kunihiko, Nemoto Yuichi, Yamada-Kaneta Hiroshi, Goto Terutaka

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   980 - 980   2011

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  • 24aGL-13 Electric Quadrupole of Iron Pnictide Superconductor by Means of Ultrasonic Measurements

    Goto T, Kurihara R, Akatsu M, Mitsumoto K, Araki K, Nemoto Y, Tatematsu S, Sato M

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   646 - 646   2011

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    DOI: 10.1143/JPSJ.80.073702

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  • 超低温におけるシリコン結晶の超音波測定

    浪指悠平, 岩上欧史, 松本宏一, 阿部聡, 赤津光洋, 馬場正太郎, 三本啓輔, 金田寛, 根本祐一, 後藤輝孝

    日本物理学会北陸支部定例学術講演会講演予稿集   2011   27   2011

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  • 21pGC-9 Quadrupole Effect on Ce_xLa_<1-x>B_6 under Uniaxial Pressure II

    Akatsu M, Kurakami K, Nemoto Y, Goto T, Kunii S

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   477 - 477   2011

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  • 25aPS-115 Specific heat in magnetic fields of R_3Pd_<20>Si_6 single crystal

    Ono H., Nakano T., Takeda N., Ano G., Akatsu M., Nemoto Y., Goto T., Kitazawa H.

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   540 - 540   2011

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    DOI: 10.11316/jpsgaiyo.66.1.3.0_540_4

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  • 25aPS-115 Specific heat in magnetic fields of R_3Pd_<20>Si_6 single crystal

    Ono H., Nakano T., Takeda N., Ano G., Akatsu M., Nemoto Y., Goto T., Kitazawa H.

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   540 - 540   2011

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    DOI: 10.11316/jpsgaiyo.66.1.3.0_540_4

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  • 24pGC-7 Determination of crystal-field diagrams for clathrate compound Pr_3Pd_<20>Si_6 by inelastic neutron scattering measurements II

    Kitazawa H, Goto T, Donni Andreas, Strassle Thierry, Keller Lukas, Matsuda M, Kakurai K, Ano G, Akatsu M, Nemoto Y

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   649 - 649   2011

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  • 24pGC-9 Kondo Effect in Rare-earth Compound Ce_3Pd_<20>Si_6 II

    Ano G, Donni Andreas, Kitazawa H, Fujita M, Mitsumoto K, Akatsu M, Nemoto Y, Goto T, Ono H, Takeda N, Sakai O

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   650 - 650   2011

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  • 21pGC-10 Quadrupole Effects of Rare-Earth Tetragonal Compound HoRh_2Si_2 in Magnetic Fields Using Ultrasonic Measurements

    Mitsumoto K, Koike T, Akatsu M, Nemoto Y, Goto T, Sigeoka T

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   477 - 477   2011

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  • 22pPSA-32 Quadrupole effect in iron pnictide superconductor Ba(Fe_<0.9>Co_<0.1>)_2As_2 using ultrasound measurements

    Kurihara R, Goto T, Araki K, Mitsumoto K, Akatsu M, Nemoto Y, Tatematsu S, Sato M

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   562 - 562   2011

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  • 27pTJ-10 Analyses on spin-orbit coupling effects of a silicon single vacancy via DFT calculations

    Ogawa Takafumi, Tsuruta Kenji, Iyetomi Hiroshi, Nemoto Yuichi, Yamada-Kaneta Hiroshi, Goto Terutaka

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   979 - 979   2011

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  • 24pGC-8 Specific heat in magnetic fields of R_3Pd_<20>Si_6 single crystal III

    Ono H., Nakano T., Takeda N., Ano G., Akatsu M., Nemoto Y., Goto T., Kitazawa H.

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   650 - 650   2011

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    DOI: 10.11316/jpsgaiyo.66.2.3.0_650_1

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  • 25aPS-114 Investigation of Quadrupole Effect and Off Center Rattling in Nd_3Pd_<20>Ge_6

    Toyada Takashi, Ano Genki, Araki Koji, Tachikawa Yoshiaki, Akatsu Mitsuhiro, Nemoto Yuichi, Goto Terutaka, Kitazawa Hideaki

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   540 - 540   2011

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  • 25aPS-116 Ultrasonic Study of Quadrupole Effect in TmAg_2In

    Tanino R, Araki K, Mitumoto K, Akatsu M, Nemoto Y, Goto T, Suzuki H.S, Takagi S

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   541 - 541   2011

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  • 25aPS-112 Ultrasonic study of Kondo Effect in Clathrate Compound Ce_3Pd_<20>Si_6

    Matsuo K, Takeda N, Sakai O, Donni Andreas, Kitazawa H, Fujita M, Ano G, Araki K, Tachikawa Y, Mitsumoto K, Akatsu M, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   540 - 540   2011

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  • 23aPS-84 Acoustic de Haas-van Alphen Effect of SmOs_4Sb_<12>

    Yanagisawa T, Baumbach Ryan E, Maple M. Brian, Monbetsu S, Hidaka H, Amitsuka H, Akatsu M, Araki K, Nemoto Y, Goto T, Ho Pei-Chun

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   596 - 596   2011

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  • 24pGC-1 Antiferro-quadrupolar ordering in PrIr_2Zn_<20>

    Ishii I, Nemoto Y, Goto T, Suzuki T, Muneshige H, Suetomi Y, Fujita T. K, Onimaru T, Matsumoto K. T, Takabatake T, Araki K, Akatsu M

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   648 - 648   2011

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  • 25aPS-113 Study of Quadrupolar Effect in Clathrate Compound Ho_3Pd_<20>Si_6

    Fujita M, Donni Andreas, Kitazawa H, Matsuo K, Ano G, Tachikawa Y, Akatsu M, Mitsumoto K, Nemoto Y, Goto T, Takeda N

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   540 - 540   2011

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  • 25aPS-108 Ultrasonic Study of Quadrupole Effect in Ce_xLa_<1-x>B_6 under Uniaxial Pressures

    Kurakami K, Akatsu M, Nemoto Y, Goto T, Kunii S

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   539 - 539   2011

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  • 25aPS-111 Quadropole Effect in Rare Earth Tetragonal Compound HoRh_2Si_2

    Koike T, Mitsumoto K, Akatsu M, Nemoto Y, Goto T, Shigeoka T

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   539 - 539   2011

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  • 24pGC-8 Specific heat in magnetic fields of R_3Pd_<20>Si_6 single crystal III

    Ono H., Nakano T., Takeda N., Ano G., Akatsu M., Nemoto Y., Goto T., Kitazawa H.

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   650 - 650   2011

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    DOI: 10.11316/jpsgaiyo.66.2.3.0_650_1

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  • 第一原理分子動力学法によるシリコン原子空孔の電子状態解析

    小川貴史, 鶴田健二, 家富洋, 根本祐一, 金田寛, 後藤輝孝

    分子シミュレーション討論会講演要旨集   24th   264 - 265   2010.11

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  • P(VDF/TrFE)圧電薄膜を用いた超音波測定によるシリコン原子空孔評価法の開発

    岡部和樹, 三本啓輔, 柳瀬隆志, 赤津光洋, 馬場正太郎, 小松悟, 小野恭史, 根本祐一, 金田寛, 後藤輝孝

    応用物理学会学術講演会講演予稿集(CD-ROM)   71st   ROMBUNNO.16A-ZT-1   2010.8

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  • 第一原理計算によるシリコン単原子空孔の局在電子状態

    小川貴史, 鶴田健二, 家富洋, 根本祐一, 金田寛, 後藤輝孝

    応用物理学会学術講演会講演予稿集(CD-ROM)   71st   ROMBUNNO.16A-ZT-2   2010.8

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  • 立方晶PrCu<sub>4</sub>Agの単結晶における低温異常物性

    ZHANG S, 石川義和, 田山孝, 桑井智彦, 水島俊雄, 赤津光洋, 根本祐一, 後藤輝孝

    日本物理学会講演概要集   65 ( 2 )   460 - 460   2010.8

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  • Pr<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の四極子秩序

    赤津光洋, 阿野元貴, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, 吉川明子, 鈴木博之, 土屋佳則, DOENNI ANDREAS, 酒井治, 北澤英明, 目時直人

    日本物理学会講演概要集   65 ( 2 )   520   2010.8

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  • 希土類カゴ状化合物Ce<sub>3</sub>Pd<sub>20</sub>(Si<sub>1-x</sub>Ge<sub>x</sub>)<sub>6</sub>の低エネルギー励起

    北澤英明, 目時直人, 土屋佳則, 寺田典樹, 吉川明子, 河村幸彦, 酒井治, DOENNI Andreas, 松田雅昌, 金子耕士, 加倉井和久, 阿野元貴, 赤津光洋, 根本祐一, 武田直也, 後藤輝孝

    日本物理学会講演概要集   65 ( 2 )   584   2010.8

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  • 超音波計測によるCePd<sub>3</sub>S<sub>4</sub>の四極子効果の研究

    高橋直紀, 荒木幸治, 赤津光洋, 根本祐一, 後藤輝孝, 松岡英一, 綿引正倫, 谷垣勝己, 小野寺秀也

    日本物理学会講演概要集   65 ( 2 )   522 - 522   2010.8

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  • PrPd<sub>3</sub>の磁気相図 II

    鈴木博之, 吉川明子, 荒木幸治, 高橋直紀, 赤津光洋, 根本祐一, 後藤輝孝

    日本物理学会講演概要集   65 ( 2 )   459 - 459   2010.8

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  • 単結晶R<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の磁場中比熱

    小野宏基, 立松賢治, 中野智仁, 武田直也, 阿野元貴, 赤津光洋, 根本祐一, 後藤輝孝, 北澤英明

    日本物理学会講演概要集   65 ( 2 )   521   2010.8

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  • 充填スクッテルダイトSmOs<sub>4</sub>Sb<sub>12</sub>の超音波分散

    柳澤達也, 齋藤旬, 日高宏之, 網塚浩, 赤津光洋, 荒木幸治, 高橋直紀, 根本祐一, 後藤輝孝, HO Pei‐Chun, BAUMBACH Ryan E, MAPLE M. Brian

    日本物理学会講演概要集   65 ( 2 )   585   2010.8

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  • 混晶系Ce<sub>3</sub>Pd<sub>20</sub>(Si<sub>X</sub>Ge<sub>1-X</sub>)<sub>6</sub>のラットリング

    松尾一穂, 藤田雅也, 阿野元貴, 立川喜章, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, 吉川明子, DOENNI ANDREAS, 北澤英明

    日本物理学会講演概要集   65 ( 2 )   521   2010.8

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  • 非クラマース二重項基底を持つPrMg<sub>3</sub>の低温超音波分散

    荒木幸治, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 鈴木博之, 谷田博司, 高木滋, YASIN Shadi, ZHERHLITSYN Sergei, WOSNITZA Joachim

    日本物理学会講演概要集   65 ( 2 )   459 - 459   2010.8

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  • DFT計算によるシリコン単原子空孔の局在電子軌道の解析

    小川貴史, 鶴田健二, 家富洋, 根本祐一, 金田寛, 後藤輝孝

    日本物理学会講演概要集   65 ( 2 )   928 - 928   2010.8

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  • カゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>のラットリング

    阿野元貴, 松尾一穂, 荒木幸冶, 立川喜章, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 吉川明子, DOENNI ANDREAS, 北澤英明

    日本物理学会講演概要集   65 ( 2 )   520   2010.8

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  • 超音波計測によるボロン添加FZシリコン中の原子空孔観測

    馬場正太郎, 永井勇太, 赤津光洋, 小松悟, 三本啓輔, 根本祐一, 金田寛, 後藤輝孝

    応用物理学関係連合講演会講演予稿集(CD-ROM)   57th   ROMBUNNO.20A-TW-2   2010.3

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  • シリコン原子空孔評価:P(VDF/TrFE)圧電薄膜を用いたシリコン単結晶の超音波測定 II

    三本啓輔, 岡部和樹, 柳瀬隆志, 赤津光洋, 馬場正太郎, 永井勇太, 小松悟, 小野恭史, 根本祐一, 金田寛, 後藤輝孝

    応用物理学関係連合講演会講演予稿集(CD-ROM)   57th   ROMBUNNO.20A-TW-3   2010.3

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  • 超音波計測によるDyPd<sub>3</sub>S<sub>4</sub>の多極子秩序の研究 II

    吉川拓摩, 高橋直紀, 荒木幸治, 赤津光洋, 根本祐一, 後藤輝孝, 松岡英一, 綿引正倫, 谷垣勝己, 小野寺秀也

    日本物理学会講演概要集   65 ( 1 )   619 - 619   2010.3

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  • 超音波によるPr<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の四極子秩序

    阿野元貴, 松尾一穂, 荒木幸治, 立川喜章, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 吉川明子, DOENNI Andreas, 北澤英明

    日本物理学会講演概要集   65 ( 1 )   625   2010.3

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  • 超音波によるRPd<sub>3</sub>S<sub>4</sub>の四極子秩序の研究

    根本祐一, 吉川拓摩, 荒木幸治, 赤津光洋, 松岡英一, 綿引正倫, 谷垣勝己, 小野寺秀也, 後藤輝孝

    日本物理学会講演概要集   65 ( 1 )   624 - 624   2010.3

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  • 正方晶化合物RCu<sub>2</sub>Si<sub>2</sub>(R=Pr,Dy)の四極子効果

    後藤沙織, 三本啓輔, 荒木幸治, 赤津光洋, 根本祐一, 後藤輝孝, DUNG Nguyen Duc, 松田達磨, 芳賀芳範, 太田有基, 杉山清寛, 摂待力生, 大貫惇睦

    日本物理学会講演概要集   65 ( 1 )   618 - 618   2010.3

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  • ボロン添加FZシリコンの原子空孔軌道の四極子効果 II

    永井勇太, 馬場正太郎, 赤津光洋, 小松悟, 三本啓輔, 小川貴史, 根本祐一, 金田寛, 後藤輝孝

    日本物理学会講演概要集   65 ( 1 )   547 - 547   2010.3

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  • 超音波測定によるNd<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の電気四極子効果の研究 IV

    立川喜章, 阿野元貴, 松尾一穂, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 吉川明子, DOENNI Andress, 北澤英明

    日本物理学会講演概要集   65 ( 1 )   618   2010.3

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  • 中性子非弾性散乱法によるカゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の結晶場励起

    北澤英明, DOENNI Andreas, STRAESSLE Thierry, KELLER Lukas, 松田雅昌, 加倉井和久, 阿野元貴, 赤津光洋, 根本祐一, 後藤輝孝

    日本中性子科学会年会講演概要集   10th   61   2010

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  • 20aPS-116 Quadrupole Effect of Vacancy Orbital in Boron-Doped FZ Silicon II

    Nagai Y, Baba S, Akatsu M, Komatsu S, Mitsumoto K, Ogawa T, Nemoto Y, Yamada-Kaneta H, Goto T

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   547 - 547   2010

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  • 25aWJ-7 Ultrasonic Dispersions of Filted-Skutterudite SmOs_4Sb_<12>

    Yanagisawa T, Ho Pei-Chun, Baumbach Ryan E, Maple M. Brian, Saito H, Hidaka H, Amitsuka H, Akatsu M, Araki K, Takahashi N, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   585 - 585   2010

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  • 26aWZ-12 Analyses localized electron orbitals around a silicon single vacallcy via DFT calculations

    Ogawa Takafumi, Tsuruta Kenji, Iyetomi Hiroshi, Nemoto Yuichi, Yamada-Kaneta Hiroshi, Goto Terutaka

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   928 - 928   2010

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  • 23pPSA-49 Ultrasonic Study of Quadrupolar effect of CePd_3S_4

    Takahashi N, Araki K, Akatsu M, Nemoto Y, Goto T, Matsuoka E, Watahiki M, Tanigaki K, Onodera H

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   522 - 522   2010

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  • 25aWJ-5 Low-energy excitation of rare-earth clathrate compounds Ce_3Pd_<20>(Si_<1-x>G_x)_6

    Kitazawa H, Kaneko K, Kakurai K, Ano G, Akatsu M, Nemoto Y, Takeda N, Goto T, Metoki N, Tsuchiya Y, Terada N, Kikkawa A, Kawamura Y, Sakai O, Donni Andreas, Matsuda M

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   584 - 584   2010

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  • 23pPSA-43 Specific heat in the magnetic field of Ce_3Pd_<20>Si_6 single crystal

    Ono H., Tatematsu K., Nakano T., Takeda N., Ano G., Akatsu M., Nemoto Y., Goto T., Kitazawa H.

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   521 - 521   2010

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    DOI: 10.11316/jpsgaiyo.65.2.3.0_521_2

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  • 23pPSA-41 Rattling in Clathrate Compound Pr_3Pd_<20>Ge_6

    Ano G, Donni Andreas, Kitazawa H, Matsuo K, Araki K, Tachikawa Y, Akatsu M, Nemoto Y, Goto T, Takeda N, Kikkawa A

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   520 - 520   2010

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  • 23pPSA-42 Rattling in Clathrate Compound Ce_3Pd_<20> (Si_XGe_<1-X>)_6

    Matsuo K, Kikkawa A, Donni Andreas, Kitazawa H, Fujita M, Ano G, Tachikawa Y, Akatsu M, Mitsumoto K, Nemoto Y, Goto T, Takeda N

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   521 - 521   2010

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  • 23aXP-12 Anomalous behavior observed on a cubic single crystal PrCu_4Ag at low temperatures

    Zhang S, Isikwa Y, Tayama T, Kuwai T, Mizushima T, Akatsu M, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   460 - 460   2010

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  • 23pPSA-40 Quadrupole Ordering on Pr_3Pd_<20>Si_6

    Akatsu M, Donni Andreas, Sakai O, Kitazawa H, Metoki N, Ano G, Mitsumoto K, Nemoto Y, Goto T, Takeda N, Kikkawa A, Suzuki H, Tuchiya Y

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   520 - 520   2010

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  • 23aXP-8 Magnetic phase diagram of PrPd_3 II

    Suzuki H. S, Kikkawa A, Araki K, Takahashi N, Akatsu M, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   459 - 459   2010

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  • 23aXP-10 Ultrasonic Dispersion in Non-Kramers Doublet System PrMg_3 at Low Temperatures

    Araki K, Zherlitsyn Sergei, Wosnitza Joachim, Mitsumoto K, Akatsu M, Nemoto Y, Goto T, Suzuki H. S, Tanida H, Takagi S, Yasin Shadi

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   459 - 459   2010

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  • 21pGD-5 Ultrasonic Study of Quadrupole Ordering in RPd_3S_4

    Nemoto Y, Yoshikawa T, Araki K, Akatsu M, Matsuoka E, Watahiki M, Tanigaki K, Onodera H, Goto T

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   624 - 624   2010

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  • 21pGD-8 Ultrasonic Investigation of Quadrupole Ordering in Pr_3Pd_<20>Ge_6

    Ano G, Donni Andreas, Kitazawa H, Matsuo K, Araki K, Tachikawa Y, Akatsu M, Nemoto Y, Goto T, Takeda N, Kikkawa A

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   625 - 625   2010

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  • 21aPS-79 Ultrasonic Study of Multipole Ordering in DyPd_3S_4 II

    Yoshikawa T, Onodera H, Takahashi N, Araki K, Akatsu M, Nemoto Y, Goto T, Matsuoka E, Watahiki M, Tanigaki K

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   619 - 619   2010

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  • 21aPS-75 Study of Quadrupole Effect in Tetragonal RCu_2Si_2(R=Pr,Dy)

    Goto S, Ota Y, Sugiyama K, Settai R, Onuki Y, Mitsumoto K, Araki K, Akatsu M, Nemoto Y, Goto T, DUNG Nguyen Duc, Matsuda T. D, Haga Y

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   618 - 618   2010

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  • 21aPS-76 Study of Electric Quadrupolar Effects in Nd_3Pd_<20>Si_6 using Ultrasonic Measurements IV

    Tachikawa Y, Kitazawa H, Ano G, Matsuo K, Akatsu M, Nemoto Y, Goto T, Takeda N, Kikkawa A, Donni Andress

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   618 - 618   2010

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  • シリコン原子空孔評価:試料への直接塗布によるP(VDF/TrFE)圧電薄膜の作成

    岡部和樹, 三本啓輔, 柳瀬隆志, 赤津光洋, 小野恭史, 根本祐一, 金田寛, 後藤輝孝

    応用物理学会学術講演会講演予稿集   70th ( 1 )   400   2009.9

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  • 超音波によるB添加FZシリコンの原子空孔の電荷状態の研究

    永井勇太, 馬場正太郎, 赤津光洋, 小松悟, 渡邊肇, 三本啓輔, 小川貴史, 根本祐一, 金田寛, 後藤輝孝

    応用物理学会学術講演会講演予稿集   70th ( 1 )   399   2009.9

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  • シリコン原子空孔評価:P(VDF/TrFE)圧電薄膜を用いたシリコン単結晶の超音波測定

    三本啓輔, 岡部和樹, 柳瀬隆志, 赤津光洋, 馬場正太郎, 永井勇太, 小松悟, 小野恭史, 根本祐一, 金田寛, 後藤輝孝

    応用物理学会学術講演会講演予稿集   70th ( 1 )   400   2009.9

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  • TbCoGa<sub>5</sub>の極低温および磁場中弾性定数

    眞田直幸, 綿貫章太, 鈴木和也, 赤津光洋, 根本祐一, 後藤輝孝

    日本物理学会講演概要集   64 ( 2 )   435 - 435   2009.8

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  • 希土類カゴ状化合物Ce<sub>3</sub>Pd<sub>20</sub>(Si<sub>1-x</sub>Ge<sub>x</sub>)<sub>6</sub>の結晶場

    北澤英明, 寺田典樹, 土屋佳則, 河村幸彦, 吉川明子, 鈴木博之, DOENNI Andreas, 酒井治, 松田雅昌, 加倉井和久, 阿野元貴, 根本祐一, 後藤輝孝

    日本物理学会講演概要集   64 ( 2 )   474   2009.8

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  • ボロン添加シリコンの弾性定数の異方的な磁場依存性

    馬場正太郎, 永井勇太, 赤津光洋, 小松悟, 渡邊肇, 三本啓輔, 小川貴史, 根本祐一, 金田寛, 後藤輝孝

    日本物理学会講演概要集   64 ( 2 )   863 - 863   2009.8

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  • 超音波測定によるNd<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の電気四極子効果の研究 III

    立川喜章, 阿野元貴, 松尾一穂, 都竹星志, 小林陽樹, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, DOENNI Andreas, 北澤英明

    日本物理学会講演概要集   64 ( 2 )   433   2009.8

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  • B‐doped FZ Siの原子空孔軌道の四極子効果

    永井勇太, 馬場正太郎, 赤津光洋, 小松悟, 渡邊肇, 三本啓輔, 小川貴史, 根本祐一, 金田寛, 後藤輝孝

    日本物理学会講演概要集   64 ( 2 )   446 - 446   2009.8

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  • 超音波による正方晶化合物PrCu<sub>2</sub>Si<sub>2</sub>の四極子効果 II

    後藤沙織, 三本啓輔, 荒木幸治, 赤津光洋, 根本祐一, 後藤輝孝, DUNG Nguyen Duc, 松田達磨, 芳賀芳範, 太田有基, 杉山清寛, 摂待力生, 大貫惇睦

    日本物理学会講演概要集   64 ( 2 )   431 - 431   2009.8

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  • 充填スクッテルダイト(Pr<sub>1-x</sub>La<sub>x</sub>)Os<sub>4</sub>Sb<sub>12</sub>のラットリングとトンネリング

    根本祐一, 戸谷田貴志, 阿野元貴, 荒木幸治, 赤津光洋, 石井勲, 武田直也, 落合明, 菅原仁, 佐藤英行, 後藤輝孝

    日本物理学会講演概要集   64 ( 2 )   475   2009.8

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  • Ce<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の極低温磁化 II

    三田村裕幸, 桜庭孝明, 田山孝, 榊原俊郎, 都竹星志, 阿野元貴, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝, 吉川明子, 北澤英明

    日本物理学会講演概要集   64 ( 2 )   427   2009.8

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  • 超音波によるPr<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の四極子効果の研究

    阿野元貴, 松尾一穂, 立川喜孝, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 吉川明子, DOENNI Andreas, 北澤英明

    日本物理学会講演概要集   64 ( 2 )   432   2009.8

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  • 極低温超音波計測によるR<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>(R=Ce,Pr)の四極子秩序の研究

    赤津光洋, 阿野元貴, 都竹星志, 三本啓輔, 根本祐一, 後藤輝孝, 武田直也, 石井勲, DOENNI Andreas, 吉川明子, 北澤英明

    日本物理学会講演概要集   64 ( 2 )   474 - 474   2009.8

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  • 超音波によるPrMg<sub>3</sub>の低温量子相の研究

    荒木幸治, 吉川拓摩, 赤津光洋, 根本祐一, 後藤輝孝, 鈴木博之, 谷田博司, 高木滋

    日本物理学会講演概要集   64 ( 2 )   432 - 432   2009.8

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  • 低温超音波測定によるRCu<sub>2</sub>Si<sub>2</sub>の四極子効果

    三本啓輔, 後藤沙織, 荒木幸治, 赤津光洋, 根本祐一, 後藤輝孝, DUNG Nguyen Duc, 松田達磨, 芳賀芳範, 太田有基, 杉山清寛, 摂待力生, 大貫惇睦

    日本物理学会講演概要集   64 ( 2 )   524 - 524   2009.8

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  • 超音波計測によるDyPd<sub>3</sub>S<sub>4</sub>の多極子秩序の研究

    吉川拓摩, 高橋直紀, 荒木幸治, 赤津光洋, 根本祐一, 後藤輝孝, 石井勲, 綿引正倫, 松岡英一, 谷垣勝己, 小野寺秀也

    日本物理学会講演概要集   64 ( 2 )   435 - 435   2009.8

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  • Pr<sub>1-x</sub>Nd<sub>x</sub>Os<sub>4</sub>Sb<sub>12</sub>におけるラットリングの超音波測定

    柳澤達也, 齋藤旬, 真山太一, 池田陽一, 日高宏之, 網塚浩, 根本祐一, 後藤輝孝, 武田直也, HO P.‐C, MAPLE M. B

    日本物理学会講演概要集   64 ( 2 )   475   2009.8

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  • Single Crystal Growth and Electronic States in RCu2Sb2

    DUNG Nguyen Duc, 大貫惇睦, 武田勇司, 太田有基, 石倉達朗, 杉山清寛, 摂待力生, 松田達磨, 芳賀芳範, 竹内徹也, 播磨尚朝, 後藤沙織, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝

    固体物理   44 ( 7 )   433 - 449   2009.7

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  • 希土類ガーネットTb<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub>の磁場中弾性異常

    荒木幸治, 吉川拓摩, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝, LUETHI Bruno

    日本物理学会講演概要集   64 ( 1 )   550   2009.3

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  • BドープFZシリコンの磁場中超音波計測

    渡邊肇, 赤津光洋, 三本啓輔, 永井勇太, 馬場正太郎, 金田寛, 後藤輝孝, 根本祐一, 石井勲, 中村慎太郎

    日本物理学会講演概要集   64 ( 1 )   932 - 932   2009.3

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  • 充填スクッテルダイト化合物(Pr<sub>1‐x</sub>La<sub>x</sub>)Os<sub>4</sub>Sb<sub>12</sub>のラットリングと超伝導

    山口高央, 後藤沙織, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 柳澤達也

    日本物理学会講演概要集   64 ( 1 )   532   2009.3

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  • 希土類カゴ状化合物Pr<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の四極子秩序と磁気相図

    都竹星志, 阿野元貴, 立川喜章, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, DONNI Andreas, 北澤英明

    日本物理学会講演概要集   64 ( 1 )   534   2009.3

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  • 超音波によるDyPd<sub>3</sub>S<sub>4</sub>の四極子効果の研究

    吉川拓摩, 荒木幸治, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝, 松岡英一, 小野寺秀也

    日本物理学会講演概要集   64 ( 1 )   549 - 549   2009.3

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  • 超音波による正方晶化合物PrCu<sub>2</sub>Si<sub>2</sub>の四極子効果

    後藤沙織, 荒木幸治, 赤津光洋, 石井勲, 根本祐一, 後藤輝孝, DUNG Nguyen Duc, 松田達磨, 芳賀芳範, 太田有基, 杉山清寛, 大貫惇睦

    日本物理学会講演概要集   64 ( 1 )   549 - 549   2009.3

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  • 27aRB-11 Strain field and elastic properties of vacancy in silicon : Classical and tight-binding molecular dynamics simulations

    Ogawa T., Tsuruta K., Iyetomi H., Goto T., Yamada-Kaneta H.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   932 - 932   2009.3

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  • 27aPS-12 Quadrupolar Ordering and Phase Diagram in Rare-Earth Clathrate Compound Pr_3Pd_<20>Si_6

    Tsuduku S, Kitazawa H, Ano G, Tachikawa Y, Ishii I, Akatsu M, Nemoto Y, Goto T, Takeda N, Donni Andreas

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   534 - 534   2009

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    DOI: 10.1143/JPSJ.78.024716

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  • 中性子非弾性散乱法によるカゴ状化合物Ce<sub>3</sub>Pd<sub>20</sub>(Si<sub>1-x</sub>Ge<sub>x</sub>)<sub>6</sub>の結晶場励起

    北澤英明, 寺田典樹, 土屋佳則, 河村幸彦, 吉川明子, DOENNI Andreas, 酒井治, 松田雅昌, 加倉井和久, 阿野元貴, 根本祐一, 後藤輝孝

    日本中性子科学会年会講演概要集   9th   113   2009

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  • 26aRL-5 Crystal field of rare-earth clathrate compounds Ce_3Pd_<20>(Si_<1-x>Ge_x)_6

    Kitazawa H, Kakurai K, Ano G, Nemoto Y, Goto T, Terada N, Tsuchiya Y, Kawamura Y, Kikkawa A, Suzuki H. S, Donni Andreas, Sakai O, Matsuda M

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   474 - 474   2009

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  • 25aPS-75 Study of Electric Quadrupolar Effects in Nd_3Pd_<20>Si_6 using Ultrasonic Measurements III

    Tachikawa Y, Donni Andress, Kitazawa H, Ano G, Matsuo K, Tsuduku S, Kobayashi H, Akatsu M, Nemoto Y, Goto T, Takeda N

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   433 - 433   2009

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  • 25aPS-83 Elastic constants of TbCoGa_5 under the magnetic field and very low temperature

    Sanada Naoyuki, Watanuki Ryuta, Suzuki Kazuya, Akatsu Mitsuhiro, Nemoto Yuichi, Goto Terutaka

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   435 - 435   2009

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  • 25aPS-70 Ultrasonic Study of Quantum Phase in PrMg_3 at Low Temperatures

    Araki K, Yoshikawa T, Akatsu M, Nemoto Y, Goto T, Suzuki H. S, Tanida H, Takagi S

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   432 - 432   2009

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  • 25aPS-71 Ultrasonic Investigation of Quadropole Effect in Pr_3Pd_<20>Ge_6

    Ano G, Kitazawa H, Matsuo K, Tachikawa Y, Akatsu M, Nemoto Y, Goto T, Takeda N, Kikkawa A, Donni Andress

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   432 - 432   2009

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  • 25aPS-48 Magnetization of Ce_3Pd_<20>Si_6 at low temperatures II

    Mitamura H, Goto T, Kikkawa A, Kitazawa H, Sakuraba T, Tayama T, Sakakibara T, Tsuduku S, Ano G, Ishii I, Akatsu M, Nemoto Y

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   427 - 427   2009

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  • 25aPS-66 Ultrasonic Investigation of the Quadrupole Effect in Tetragonal PrCu_2Si_2

    Goto S, Ota Y, Sugiyama K, Settai R, Onuki Y, Mitsumoto K, Araki K, Akatsu M, Nemoto i. Y, Goto T, DUNG Nguyen Duc, Matsuda T. D, Haga Y

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   431 - 431   2009

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  • 27aPS-82 Elastic Anomaly of Rare-Earth Garnet Tb_3Ga_5O_<12> under Magnetic Fields

    Araki K, Takuma Y, Ishii I, Akatu M, Nemoto Y, Goto T, Luthi Bruno

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   550 - 550   2009

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  • 27aRB-8 Ultrasonic Measurements of Elastic Constants under Magnetic fields in B-doped Silicon Crystal grown by FZ method

    Watanabe Hajime, Nakamura Shintaro, Akatsu Mitsuhiro, Mitsumoto Keisuke, Nagai Yuta, Baba Shotaro, Yamada-Kaneta Hiroshi, Goto Terutaka, Nemoto Yuichi, Ishii Isao

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   932 - 932   2009

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  • 25aPS-84 Ultrasonic Study of Multipole Ordering in DyPd_3S_4

    Yoshikawa T, Tanigaki K, Onodera H, Takahashi N, Araki K, Akatsu M, Nemoto Y, Goto T, Ishii I, Watahiki M, Matsuoka E

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   435 - 435   2009

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  • 27aPS-80 Ultrasonic Investigation of the Quadrupole Effect in Tetragonal PrCu_2Si_2

    Goto S, Ota Y, Sugiyama K, Onuki Y, Araki K, Akatsu M, Ishii I, Nemoto Y, Goto T, DUNG Nguyen Duc, Matsuda T. D, Haga Y

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   549 - 549   2009

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  • 25aPS-132 The Quadrupole Effect of Vacancy Orbital in Boron-Doped FZ Silicon

    Nagai Y, Goto T, Baba S, Akatsu M, Komatsu S, Watanabe H, Mitsumoto K, Ogawa T, Nemoto Y, Yamada-Kaneta H

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   446 - 446   2009

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  • 25pYK-9 Anisotropic Magnetic Field Dependence of Elastic Constant in Boron-doped Silicon Crystal

    Baba S, Goto T, Nagai Y, Akatsu M, Komatsu S, Watanabe H, Mitsumoto K, Ogawa T, Nemoto Y, Kaneta H

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   863 - 863   2009

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  • 26aRL-11 Ultrasonic Measurement of Ratting in Pr_<1-x>Nd_xOs_4Sb_<12>

    Yanagisawa T, Ho P. -C, Maple M. B, Saito H, Mayama T, Ikeda Y, Hidaka H, Amitsuka H, Nemoto Y, Goto T, Takeda N

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   475 - 475   2009

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  • 26pTJ-13 Study of quadrupole effect in RCu_2Si_2 using low-temperature ultrasonic measurements

    Mitsumoto K, Ota Y, Sugiyama K, Settai R, Onuki Y, Goto S, Araki K, Akatsu M, Nemoto Y, Goto T, Dung Nguyen Duc, Matsuda T, Haga Y

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   524 - 524   2009

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  • 26aRL-6 Ultrasonic Study of Quadrupole Ordering on R_3Pd_<20>Si_6(R=Ce, Pr) at Low Temperatures

    Akatsu M, Kikkawa A, Kitazawa H, Ano G, Tsuduku S, Mitsumoto K, Nemoto Y, Goto T, Takeda N, Ishii I, Donni Andreas

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   474 - 474   2009

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  • 26aRL-10 Ratting and Tunneling in The Filled Skutterudite (Pr_<1-x>La_x)Os_4Sb_<12>

    Nemoto Y, Sato H, Goto T, Toyada T, Ano G, Araki K, Akatsu M, Ishii I, Takeda N, Ochiai A, Sugawara H

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   475 - 475   2009

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  • 27aPS-3 Rattling and Superconductivity in the Filled Skutterudite (Pr_<1-x>La_x)Os_4Sb_<12>

    Yamaguchi A, Goto S, Ishii I, Akatsu M, Nemoto Y, Goto T, Takeda N, Yanagisawa T

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   532 - 532   2009

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  • 27aPS-79 Ultrasonic Study of Quadrupole Effect in DyPd_3S_4

    Yoshikawa T, Araki K, Ishii I, Akatsu M, Nemoto Y, Goto T, Matsuoka E, Onodera H

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   549 - 549   2009

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  • 充填スクッテルダイトPr<sub>0.55</sub>Nd<sub>0.45</sub>Os<sub>4</sub>Sb<sub>12</sub>の超音波分散

    柳澤達也, 真山太一, 森下明, 日高宏之, 網塚浩, 山口高央, 根本祐一, 後藤輝孝, 武田直也, HO Pei‐Chun, MAPLE M.Brian

    日本物理学会講演概要集   63 ( 2 )   495   2008.8

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  • PrM<sub>3</sub>O<sub>9</sub>(M=Nb,Ta)単結晶の磁性

    吉川明子, 鈴木博之, 河村幸彦, 今中康貴, 北澤英明, 荒木幸治, 吉川拓摩, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝

    日本物理学会講演概要集   63 ( 2 )   402   2008.8

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  • 充填スクッテルダイト(Pr<sub>1-x</sub>La<sub>x</sub>)Os<sub>4</sub>Sb<sub>12</sub>のラットリング

    山口高央, 後藤沙織, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 柳澤達也

    日本物理学会講演概要集   63 ( 2 )   496   2008.8

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  • Ce<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の極低温磁化

    三田村裕幸, 桜庭孝明, 田山孝, 榊原俊郎, 都竹星志, 阿野元貴, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝, 北澤英明

    日本物理学会講演概要集   63 ( 2 )   505   2008.8

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  • 超音波による非クラマースΓ<sub>3</sub>基底を持つPrMg<sub>3</sub>の四極子効果

    荒木幸治, 吉川拓摩, 赤津光洋, 石井勲, 根本祐一, 後藤輝孝, 鈴木博之, 谷田博司, 高木滋

    日本物理学会講演概要集   63 ( 2 )   528 - 528   2008.8

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  • 充填スクッテルダイトCeFe<sub>4</sub>Sb<sub>12</sub>の弾性特性

    石井勲, 山口高央, 後藤沙織, 根本祐一, 後藤輝孝, 藤田貴弘, 森育子, 菅原仁, 吉澤正人, 鈴木孝至

    日本物理学会講演概要集   63 ( 2 )   495   2008.8

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  • 立方晶PrM<sub>3</sub>B<sub>X</sub>(M=Pd,Rh)の結晶場基底状態

    鈴木博之, 吉川明子, 河村幸彦, 北澤英明, 荒木幸治, 吉川拓摩, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝

    日本物理学会講演概要集   63 ( 2 )   403 - 403   2008.8

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  • Ce<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>単結晶の磁場中比熱

    塩原大輔, 立松賢治, 都竹星志, 阿野元貴, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 北澤英明

    日本物理学会講演概要集   63 ( 2 )   505   2008.8

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  • 超音波計測によるデバイス用シリコン結晶中の原子空孔観測

    渡邊肇, 赤津光洋, 三本啓輔, 馬場正太郎, 永井勇太, 金田寛, 後藤輝孝, 根本祐一, 石井勲, 中村慎太郎

    日本物理学会講演概要集   63 ( 2 )   867 - 867   2008.8

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  • 超音波測定によるNd<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の電気四極子効果の研究 II

    立川喜章, 都竹星志, 阿野元貴, 赤津光洋, 石井勲, 根本祐一, 後藤輝孝, 武田直也, DOENNI Andress, 北澤英明

    日本物理学会講演概要集   63 ( 2 )   506   2008.8

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  • カゴ状物質R<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>(R=Ce,Pr)の中性子非弾性散乱と強磁場磁化

    北沢英明, DUENNI Andreas, MIHALIK Matus, 柳町治, 松田雅昌, 金子耕士, 目時直人, 加倉井和久, 都竹星志, 阿野元貴, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝

    日本物理学会講演概要集   63 ( 2 )   528 - 528   2008.8

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  • 低温超音波計測によるシリコン原子空孔の物性研究と産業応用

    後藤輝孝, 金田寛, 渡辺肇, 永井勇太, 馬場正太郎, 赤津光洋, 根本祐一, 石井勳, 三本啓介, 中村慎太郎

    日本物理学会講演概要集   63 ( 2 )   874 - 874   2008.8

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  • 超音波測定によるCe<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の電気四極子効果の研究 II

    都竹星志, 阿野元貴, 立川喜章, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, DOENNI Andress, 北澤英明

    日本物理学会講演概要集   63 ( 2 )   506   2008.8

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  • 21aRB-10 Revisit to the Ground State for a Single Vacancy in Crystal Silicon

    Ogawa T., Tsuruta K., Iyetomi H., Goto T., Kaneta H. Y.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   868 - 868   2008.8

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  • Thermodynamic and transport studies of the ferromagnetic filled skutterudite compound PrFe4 As12

    T. A. Sayles, W. M. Yuhasz, J. Paglione, T. Yanagisawa, J. R. Jeffries, M. B. Maple, Z. Henkie, A. Pietraszko, T. Cichorek, R. Wawryk, Y. Nemoto, T. Goto

    Physical Review B - Condensed Matter and Materials Physics   77 ( 14 )   2008.4

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    A variety of thermodynamic and transport measurements were made on high-quality single crystals of the Pr-based filled skutterudite compound PrFe4 As12. Abrupt features in magnetization, ac susceptibility, specific heat, resistivity, thermoelectric power, and ultrasonic velocity reveal the onset of long range ferromagnetic order below ΘC =18K. The low-temperature magnetic susceptibility is characterized by a Curie-Weiss law with an effective moment of 3.52 μB /f.u. and a saturation magnetization of 2.3 μB /f.u., which is consistent with a magnetic Γ5 triplet ground state. A gaplike reduction of the large electronic specific heat coefficient of 340mJ/mol K2 and several other features point to a strongly correlated electron behavior that is likely coupled to a change in magnetic and/or structural order near T12K. Furthermore, this complex magnetic state is found to be strongly field dependent, as evidenced by a change in the easy axis at low fields and an additional contribution to thermal conductivity appearing only at high fields. © 2008 The American Physical Society.

    DOI: 10.1103/PhysRevB.77.144432

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  • Ultrasonic dispersion due to off-center rattling in NdOs4Sb12

    T. Yanagisawa, W. M. Yuhasz, P-C. Ho, M. B. Maple, H. Watanabe, Y. Yasumoto, Y. Nemoto, T. Goto

    PHYSICA B-CONDENSED MATTER   403 ( 5-9 )   735 - 738   2008.4

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    Ultrasonic investigation for the single crystals of ferromagnetic filled skutterudite compound NdOs4Sb12 was performed. A marked frequency dependence of the ultrasonic dispersion has been observed in a longitudinal elastic constant C-11 at temperature centered around 45 K; however, no dispersion was measured in the transverse elastic constant C-44. Such a clear mode difference in the ultrasonic dispersion, which has been found in PrOs4Sb12, strongly suggests that Nd ion in NdOs4Sb12 bears thermally activated off-center rattling effect. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2007.10.227

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  • Magnetic ordering in PrFe4As12

    T. A. Sayles, W. M. Yuhasz, J. Paglione, T. Yanagisawa, J. R. Jeffries, M. B. Maple, Z. Henkie, A. Pietraszko, T. Cichorek, R. Wawryk, Y. Nemoto, T. Goto

    PHYSICA B-CONDENSED MATTER   403 ( 5-9 )   869 - 870   2008.4

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    Magnetization M(H,T), specific heat C(T), and electrical resistivity p(T), measurements were performed on single crystals of the Pr-based filled skutterudite compound PrFe4As12. M(H) isotherms indicate a saturation magnetization of 2.3 mu(B)/f.u., and Arrott analysis reveals a Curie temperature T-C = 18.2 K and saturated moment Mat = 2.0 mu(B)/f.u. Curie-Weiss analysis of magnetic susceptibility, chi, reveals two distinct regions: for T &gt; 100 K, the effective moment mu(eff) = 3.98 mu(B) and the Curie-Weiss temperature theta(CW) = 4.1 K, while for 19.5 &lt; T&lt; 75 K, mu(eff) = 3.52 mu(B) and theta(CW) = 17.7 K. C(T) and rho(7) show distinct features at T-C, while the ac susceptibility exhibits lower temperature features, possibly associated with changes in magnetic structure. (c) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2007.10.268

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  • 低温超音波計測による酸化熱処理FZシリコン結晶の原子空孔観測

    渡邊肇, 後藤輝孝, 金田寛, 根本祐一, 昆金正敏, 柳澤達也, 中村慎太郎

    応用物理学関係連合講演会講演予稿集   55th ( 2 )   816   2008.3

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  • 低温弾性ソフト化から観たシリコン原子空孔に与える高温アニールの影響:Ar,O<sub>2</sub>,N<sub>2</sub>,H<sub>2</sub>雰囲気

    金田寛, 渡辺肇, 後藤輝孝, 根本祐一, 昆金正敏, 柳澤達也, 中村慎太郎

    応用物理学関係連合講演会講演予稿集   55th ( 1 )   447   2008.3

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  • Ultrasonic investigation of field-dependent ordered phases in the filled skutterudite compound PrOs(4)As(12)

    T. Yanagisawa, W. M. Yuhasz, T. A. Sayles, P. -C. Ho, M. B. Maple, H. Watanabe, Y. Yasumoto, Y. Nemoto, T. Goto

    PHYSICAL REVIEW B   77 ( 9 )   2008.3

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    Elastic constant measurements down to 0.48 K and in magnetic fields up to 11 T were performed on a single crystal of the filled skutterudite compound PrOs(4)As(12). The longitudinal C(L111)= C(B)+ 4C(44)/3 mode shows Curie-type softening below similar to 25 K, which is explained in terms of the quadrupole susceptibility modified by a crystalline electric field with a Gamma((2))(4) ground state. A detailed H-T phase diagram for H parallel to[111] is compiled with the elastic anomalies, which appear on the boundaries of two ordered phases at temperatures below 2.3 K and in fields below 3 T. The intermediate phase between 2 and 2.5 T assumes the aspect of antiferroquadrupolar ordering.

    DOI: 10.1103/PhysRevB.77.094435

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  • 低温超音波計測による酸化熱処理シリコン結晶の原子空孔観測

    渡邊肇, 後藤輝孝, 金田寛, 根本祐一, 昆金正敏, 柳澤達也, 中村慎太郎

    日本物理学会講演概要集   63 ( 1 )   936 - 936   2008.2

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  • 超音波測定によるNd<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の電気四極子効果の研究

    立川喜章, 小林陽樹, 都竹星志, 阿野元貴, 柳澤達也, 根本祐一, 後藤輝孝, 武田直也, DOENNI Andreas, 北澤英明

    日本物理学会講演概要集   63 ( 1 )   549   2008.2

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  • 超音波による希土類ガーネットTb<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub>の四極子効果の研究

    荒木幸治, 後藤輝孝, 根本祐一, 柳澤達也, LUETHI Bruno

    日本物理学会講演概要集   63 ( 1 )   549   2008.2

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  • 充填スクッテルダイトPrFe<sub>4</sub>As<sub>12</sub>の超音波測定

    柳澤達也, 安本百合, 山口高央, 根本祐一, 後藤輝孝, SAYLES T. A, YUHASZ W. M, PAGLIONE J, JEFFRIES J. R, MAPLE M. B, HENKIE Z, PIETRASZKO A, CICHOREK T, WAWRYK R

    日本物理学会講演概要集   63 ( 1 )   538   2008.2

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  • クラスレート化合物,La<sub>3</sub>Pd<sub>20</sub>T<sub>6</sub>(T=Si and Ge)のケージ副構造とサイト占有率

    松下能孝, 佐藤晃, 小林陽樹, DOENNI A, 北澤英明, 泉富士夫, 根本祐一, 後藤輝孝, 金子雅一, 佐々木進, 岸本直樹

    日本物理学会講演概要集   63 ( 1 )   442 - 442   2008.2

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  • 充填スクッテルダイトLaOs<sub>4</sub>Sb<sub>12</sub>のラットリングおよびトンネリングの研究 II

    安本百合, 山口高央, 柳澤達也, 根本祐一, 後藤輝孝, 落合明

    日本物理学会講演概要集   63 ( 1 )   567 - 567   2008.2

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  • バルス磁場超音波計測によるCe<sub>x</sub>La<sub>1-x</sub>B<sub>6</sub>の反強四極子秩序の研究

    赤津光洋, 三田村裕幸, 森江孝明, 榊原俊郎, 金道浩一, 根本祐一, 後藤輝孝, 中村慎太郎, 国井暁

    日本物理学会講演概要集   63 ( 1 )   542   2008.2

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  • FZシリコン結晶における低温弾性ソフト化:高温長時間酸素アニールの影響

    金田寛, 渡辺肇, 昆金正敏, 後藤輝孝, 根本祐一, 柳澤達也, 中村慎太郎

    日本物理学会講演概要集   63 ( 1 )   936 - 936   2008.2

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  • 中性子非弾性散乱法によるカゴ状物質R<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>(R=Ce,Pr)の結晶場励起 II

    北澤英明, DOENNI Andreas, MIHALIK Matus, 松田雅昌, 金子耕士, 目時直人, 加倉井和久, 小林陽樹, 根本祐一, 後藤輝孝

    日本物理学会講演概要集   63 ( 1 )   545 - 545   2008.2

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  • 超音波測定によるPr<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の電気四極子効果の研究

    小林陽樹, 都竹星志, 鈴木修, 柳沢達也, 根本祐一, 後藤輝孝, 武田直也, DOENNI Andreas, 北澤英明

    日本物理学会講演概要集   63 ( 1 )   528   2008.2

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  • 超音波によるCe<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の電気四極子効果の研究

    都竹星志, 小林陽樹, 立川喜章, 鈴木修, 柳澤達也, 根本祐一, 後藤輝孝, 武田直也, DOENNI Andress, 北澤英明

    日本物理学会講演概要集   63 ( 1 )   549   2008.2

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  • 超音波測定によるCe<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の四極子秩序の研究

    後藤輝孝, 小林陽樹, 都竹星志, 渡辺智行, 鈴木修, 柳沢達也, 根本祐一, 武田直也, DOENNI Andreas, 北澤英明

    日本物理学会講演概要集   63 ( 1 )   527   2008.2

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  • Magneto-elastic properties of Tb3Ga5O12 (TGG)

    K. Araki, T. Goto, Y. Nemoto, T. Yanagisawa, B. Luethi

    EUROPEAN PHYSICAL JOURNAL B   61 ( 3 )   257 - 259   2008.2

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    The temperature dependence of the elastic constants in Tb3Ga5O12 was measured and analysed with a simple crystal field model. The magneto-elastic coupling constants have been deduced from this experiment. The coupling constant g(Gamma 5), related to the c(44) mode, is anomalously large. These coupling constants are important for the interpretation of the phonon Hall effect.

    DOI: 10.1140/epjb/e2008-00077-1

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  • Quadrupole Effect in the Filled Skutterudite Compound PrOs4As12

    T. Yanagisawa, Y. Yasumoto, Y. Nemoto, T. Goto, W. M. Yuhasz, P-C. Ho, M. B. Maple, Z. Henkie, A. Pietraszko

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77   225 - 228   2008.1

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    Ultrasonic investigation of a single crystal of the filled skutterudite antiferromagnetic compound PrOs4As12 was performed. Curie-type softening appeared in C-L111 = C-B + 4/3C(44) and C-T111 = 2/3(C-11 - C-12)/2 + 4/3C(44), is explained in terms of the quadrupole susceptibility modified by a crystalline electric field with a Gamma((2))(4) -triplet ground state and a Gamma(1)-singlet first excited state. The quadrupole susceptibility analysis finds that the intersite quadrupole interactions in this compound are negative, indicating an antiferro-quadrupolar type interaction. Additional ultrasonic features, appeared in an ordered phase under magnetic fields between 2 T and 3 T for H \\ [111] and H \\ [110], suggest the existence of another intermediate phase boundary. Magnetic field-temperature (H - T) phase diagrams for H \\ [111] and H \\ [1 (1) over bar0], which exhibits strong magnetic anisotropy, were obtained.

    DOI: 10.1143/JPSJS.77SA.225

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  • 21aPS-13 Investigation of Rattling in The Filled Skutterudite (Pr_<1-x>La_x)Os_4Sb_<12>

    Yamaguchi A, Goto S, Ishii I, Akatsu M, Nemoto Y, Goto T, Takeda N, Yanagisawa T

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   496 - 496   2008

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    DOI: 10.1143/JPSJ.77.074607

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  • 21pPSB-3 Crystal field ground state of cubic compounds PrM_3B_x(M=Pd,Rh)

    Suzuki H. S, Goto T, Kikkawa A, Kawamura Y, Kitazawa H, Araki K, Yoshikawa T, Ishii I, Akatsu M, Nemoto Y

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   403 - 403   2008

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  • 23pPSB-15 Ultrasonic Investigation of Quadrupole Effect in Clathrate Compound Ce_3Pd_<20>Si_6

    Tsuduku S, Kitazawa H, Kobayashi H, Tachikawa Y, Suzuki O, Yanagisawa T, Nemoto Y, Goto T, Takeda N, Donni Andress

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   549 - 549   2008

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  • 23aPS-74 Cage Substructures and Site Occupancies in Clathrate Compounds, La_3Pd_<20>T_6(T=Si and Ge)

    Matsushita Y, Sasaki S, Kishimoto N, Sato A, Kobayashi H, Donni A, Kitazawa H, Izumi F, Nemoto Y, Goto T, Kaneko M

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   442 - 442   2008

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  • 23pPSB-16 Study of Electric Quadrupolar Effects in Nd_3Pd_<20>Si_6

    Tachikawa Y, Kitazawa H, Kobayashi H, Tsuduku S, Ano G, Yanagisawa T, Nemoto Y, Goto T, Takeda N, Donni Andreas

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   549 - 549   2008

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  • 23pWR-7 Ultrasonic Investigation of Quadrupole Ordering in Ce_3Pd_<20>Si_6

    Goto T, Kobayashi H, Tsuduku S, Watanabe T, Suzuki O, Yanagisawa T, Nemoto Y, Takeda N, Donni Andreas

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   527 - 527   2008

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  • 23pPSA-15 Ultrasonic Measurements of Filled-skutterudite PrFe_4As_<12>

    Yanagisawa T, Maple M.B, Henkie Z, Pietraszko A, Cichorek T, Wawryk R, Yasumoto Y, Yamaguchi A, Nemoto Y, Goto T, Sayles T.A, Yuhasz W.M, Paglione J, Jeffries J.R

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   538 - 538   2008

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  • 23pWR-8 Ultrasonic Investigation of Electric Quadrupole Effect in Pr_3Pd_<20>Si_6

    Kobayashi H, Tsuduku S, Suzuki O, Yanagisawa T, Nemoto Y, Goto T, Takeda N, Donni Andreas, Kitazawa H

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   528 - 528   2008

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  • 23pPSA-42 Crystalline-electric field excitations in the clathrate compound R_3Pd_<20>Si_6(R=Ce,Pr) studied by inelastic neutron scattering II

    Kitazawa H, Goto T, Donni Andreas, Mihalik Matus, Matsuda M, Kaneko K, Metoki N, Kakurai K, Kobayashi H, Nemoto Y

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   545 - 545   2008

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  • 23pPSA-29 Ultrasonic Study of Antiferro Quadrupole Ordering on Ce_xLa_<1-x>B_6 in Pulsed Magnetic Fields

    Akatsu M, Mitamura H, Morie T, Sakakibara T, Kindo K, Nemoto Y, Goto T, Nakamura S, Kunii S

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   542 - 542   2008

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  • 21aPS-56 Study of Electric Quadrupolar Effects in Nd_3Pd_<20>Si_6 using Ultrasonic Measurements II

    Tachikawa Y, Kitazawa H, Tsuduku S, Ano G, Akatsu M, Ishii I, Nemoto Y, Goto T, Takeda N, Donni Andress

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   506 - 506   2008

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  • 21pQB-6 Ultrasonic Investigation of Quadrupolar Effect for Non-Kramers Γ_3 Doublet in PrMg_3

    Araki K, Yoshikawa T, Akatsu M, Ishii I, Nemoto Y, Goto T, Suzuki H. S, Tanida H, Takagi S

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   528 - 528   2008

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  • 24aWR-10 Neutron scattering study of phonon dynamics on La_3Pd_<20>Ge_6

    Lee C.H, Yoshizawa H, Kihou K, Hase I, Nemoto Y, Kaneko K, Goto T

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   567 - 567   2008

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  • 24aWR-8 Investigation of Rattling and Tunneling in The Filled Skutterudite LaOs_4Sb_<12> II

    Yasumoto Y, Yamaguchi A, Yanagisawa T, Nemoto Y, Goto T, Ochiai A

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   567 - 567   2008

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  • 24pYF-2 Low-temperature elastic softening due to vacancies in floating-zone-grown silicon crystals : Effect of high-temperature oxidation

    Yamada-Kaneta Hiroshi, Watanabe Hajime, Hikin Masatoshi, Goto Terutaka, Nemoto Yuichi, Yanagisawa Tatsuya, Nakamura Shintaro

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   936 - 936   2008

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  • 24pYF-3 The Observation of Vacancy in O_2 annealed Silicon Crystal Using Ultrasonic Measurements at Low Temperature

    Watanabe Hajime, Goto Terutaka, Yamada-Kaneta Hiroshi, Nemoto Yuichi, Hikin Masatoshi, Yanagisawa Tatsuya, Nakamura Shintaro

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   936 - 936   2008

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  • 21pRB-1 Study on silicon vacancy by low-temperature ultrasonic measurements and its application to industry

    Goto Terutaka, Nakamura Shintaro, Yamada-Kaneta Hiroshi, Watanabe Hajime, Nagai Yuta, Baba Shotaro, Akatsu Mitsuhiro, Nemoto Yuichi, Ishi Isao, Mitsumoto Keisuke

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   874 - 874   2008

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  • 23pPSB-14 Ultrasonic Study of Quadrupolar Effect in Rare-Earth Garnet Tb_3Ga_5O_<12>

    Araki K, Goto T, Nemoto Y, Yanagisawa T, Luthi Bruno

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   549 - 549   2008

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  • 21pQB-9 Inelastic neutron scattering and high-field magnetization of the clathrate compounds R_3Pd_<20>Si_6 (R=Ce, Pr)

    Kitazawa H, Ano G, Ishii I, Akatsu M, Nemoto Y, Goto T, Donni Andreas, Mihalik Matus, Yanagimachi O, Matsuda M, Kaneko K, Metoki N, Kakurai K, Tsuduku S

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   528 - 528   2008

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  • 21aRB-7 The Observation of Vacancy in Silicon Crystal by Using Ultrasonic Measurements at Low Temperature

    Watanabe Hajime, Nakamura Shintaro, Akatsu Mitsuhiro, Mitsumoto Keisuke, Baba Shotaro, Nagai Yuta, Yamada-Kaneta Hiroshi, Goto Terutaka, Nemoto Yuichi, Ishii Isao

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   867 - 867   2008

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  • 21aPS-55 Ultrasonic Investigation of Quadrupole Effect in Ce_3Pd_<20>Si_6 II

    Tsuduku S, Kitazawa H, Ano G, Tachikawa Y, Ishii I, Akatsu M, Nemoto Y, Goto T, Takeda N, Donni Andress

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   506 - 506   2008

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  • 21aPS-53 Magnetization of Ce_3Pd_20Si_6 at low temperatures

    Mitamura H, Goto T, Kitazawa H, Sakuraba T, Tayama T, Sakakibara T, Tsuduku S, Ano G, Ishii I, Akatsu M, Nemoto Y

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   505 - 505   2008

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  • 21aPS-54 Specific heat in the magnetic field of Ce_3Pd_<20>Si_6 single crystal

    Shiobara D, Kitazawa H, Tatematsu K, Tsuduku S, Ano G, Ishii I, Akatsu M, Nemoto Y, Goto T, Takeda N

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   505 - 505   2008

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  • 21aPS-8 Elastic properties of filled skutterudite CeFe_4Sb_<12>

    Ishii I, Suzuki T, Yamaguchi A, Goto S, Nemoto Y, Goto T, Fujita T, Mori B, Sugawara H, Yoshizawa M

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   495 - 495   2008

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  • 21aPS-11 Ultrasonic Dispersion in the Filled-Skutterudite Pr_<0.55>Nd<0.45>Os_4Sb_<12>

    Yanagisawa T, Ho Pei-Chun, Maple M. Brian, Mayama T, Morishita A, Hidaka H, Amitsuka H, Yamaguchi A, Nemoto Y, Goto T, Takeda N

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   495 - 495   2008

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  • 21pPSB-2 Magnetic properties of PrM_3O_9 (M=Nb,Ta) single crystal

    Kikkawa A, Nemoto Y, Goto T, Suzuki H.S, Kawamura Y, Imanaka Y, Kitazawa H, Araki K, Yoshikawa T, Ishii I, Akatsu M

    Meeting Abstracts of the Physical Society of Japan   63 ( 0 )   402 - 402   2008

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  • 超音波測定法によるCZ‐Si結晶中の原子空孔濃度分布評価

    昆金正敏, 後藤輝孝, 金田寛, 根本祐一, 渡邉肇, 柳澤達也, 中村慎太郎

    応用物理学会学術講演会講演予稿集   68th ( 1 )   433   2007.9

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  • シリコン原子空孔の電子軌道と電気四極子

    後藤輝孝, 金田寛, 昆金正敏, 根本祐一, 中村慎太郎

    応用物理学会学術講演会講演予稿集   68th ( 0 )   41   2007.9

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  • 一軸圧超音波計測によるCe<sub>0.75</sub>La<sub>0.25</sub>B<sub>6</sub>のIV相の研究

    赤津光洋, 森江孝明, 榊原俊郎, 根本祐一, 後藤輝孝, 国井暁

    日本物理学会講演概要集   62 ( 2 )   566   2007.8

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  • 超音波計測によるCZシリコン中の原子空孔濃度分布の研究

    昆金正敏, 後藤輝孝, 金田寛, 根本祐一, 渡邊肇, 柳澤達也, 中村慎太郎

    日本物理学会講演概要集   62 ( 2 )   994 - 994   2007.8

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  • 超音波による充填スクッテルダイトLaOs<sub>4</sub>Sb<sub>12</sub>のオフセンターラットリングおよびトンネリングの研究

    安本百合, 渡邊彦睦, 柳澤達也, 山口高央, 根本祐一, 後藤輝孝, 落合明

    日本物理学会講演概要集   62 ( 2 )   576   2007.8

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  • 超音波測定によるR<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>(R=Ce,Pr)の電気四極子効果の研究

    小林陽樹, 都竹星志, 鈴木修, 根本祐一, 後藤輝孝, 武田直也, DOENNI Andreas, 北澤英明

    日本物理学会講演概要集   62 ( 2 )   565   2007.8

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  • 充填スクッテルダイトのラットリングとトンネリング

    根本祐一, 安本百合, 山口高央, 柳澤達也, 後藤輝孝, 武田直也, 落合明, 菅原仁, 佐藤英行

    日本物理学会講演概要集   62 ( 2 )   515 - 515   2007.8

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  • シリコン原子空孔の電子軌道と電気四極子

    後藤輝孝, 金田寛, 昆金正敏, 根本祐一, 渡邊肇, 柳澤達也, 中村慎太郎

    日本物理学会講演概要集   62 ( 2 )   993 - 993   2007.8

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  • NdOs<sub>4</sub>Sb<sub>12</sub>のラットリングによる超音波分散

    柳澤達也, 安本百合, 山口高央, 根本祐一, 後藤輝孝, YUHASZ William M, HO Pei‐Chun, MAPLE M. Brian

    日本物理学会講演概要集   62 ( 2 )   515   2007.8

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  • カゴ状物質La<sub>3</sub>Pd<sub>20</sub>X<sub>6</sub>(X=Ge,Si)の4aサイトLaのNMR異常

    佐々木進, HASSAN N, 佐藤真哉, 金子雅一, 工藤将倫, 小林陽樹, 根本祐一, 後藤輝孝, 松下能孝, DOENNI A, 北澤英明

    日本物理学会講演概要集   62 ( 2 )   516 - 516   2007.8

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  • 単結晶中性子回折法によるカゴ状物質Ce<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の低温磁気相図

    DOENNI A, 北澤英明, 根本祐一, 後藤輝孝, ZAHARKO Okusana, KELLER Lukas

    日本物理学会講演概要集   62 ( 2 )   580   2007.8

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  • 領域10,8「カゴに内包された原子の局所振動 : ラットリングと量子効果」(2007年春季大会シンポジウムの報告)

    後藤 輝孝

    日本物理學會誌   62 ( 7 )   546 - 547   2007.7

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  • 低温超音波計測によるCZシリコン結晶の原子空孔濃度分布測定:R‐OSF域とボイド領域

    佐藤幸治, 昆金正敏, 金田寛, 根本祐一, 鈴木修, 中村慎太郎, 後藤輝孝

    応用物理学関係連合講演会講演予稿集   54th ( 1 )   450   2007.3

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  • 低温超音波計測によるCZシリコン結晶成長時の点欠陥反応の実験的解析

    金田寛, 佐藤幸治, 昆金正敏, 根本祐一, 鈴木修, 中村慎太郎, 後藤輝孝

    応用物理学関係連合講演会講演予稿集   54th ( 1 )   450   2007.3

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  • Raman scattering on La3Pd20X6 (X = Si, Ge)

    T. Hasegawa, Y. Takasu, T. Kondou, N. Ogita, M. Udagawa, T. Yamaguchi, T. Watanabe, Y. Nemoto, T. Goto

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   984 - 986   2007.3

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    We have measured Raman spectra of La3Pd20Ge6 and La3Pd20Si6 single crystals from 4 K to room temperature. For both crystals, all Raman-active modes have been found without additional modes. Thus, there is no evidence that La atoms locate on off-center positions in the cages. By a comparison with La3Pd20Si6, two anomalous results have been observed only in La3Pd20Ge6. One is a large broad peak due to the second order Raman scattering below 140cm(-1). The other is that the energy of the lowest-energy T-2g mode, which is the vibration of the La(2) atoms, decreases with decreasing temperature. Since the latter behavior is also found in the clathrate compounds A(8)Ga(16)Ge(3)O (A = Ba, Sr, Eu), we believe that this behavior is universal for thermal motion of weakly bound guest atoms to cages. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1007/j.jmmm.2006.10.407

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  • 18pXA-1 Symposium : Local oscillator of guest atom filled in cage- Rattling and quantum effect

    Goto Terutaka

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   511 - 511   2007.2

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  • Novel ultrasonic tool for vacancy observation in crystalline silicon

    Terutaka Goto, Hiroshi Yamada-Kaneta, Masatoshi Hikin, Koji Sato, Yuichi Nemoto, Shintaro Nakamura

    ECS Transactions   11 ( 3 )   187 - 194   2007

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    Low-temperature ultrasonic measurements were employed for observation of isolated vacancies in crystalline silicon. The elastic constants of FZ crystalline silicon revealed low-temperature softening below about 20 K down to base temperature 20 mK in present experiments. The softening of non-doped FZ silicon being free from applied magnetic filed indicates non-magnetic charge state V0 of vacancy. The disappearance of softening in boron-doped FZ silicon under applied magnetic fields up 2T means magnetic charge state V +. This novel ultrasonic tool succeeded in observation of low-temperature softening in perfect crystal region of non-doped CZ silicon ingot indicating distribution of isolated vacancies. © The Electrochemical Society.

    DOI: 10.1149/1.2778661

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  • 18pPSA-47 Neutron scattering experiments on R_3Pd_<20>X_6(X=Ge,Si) compounds

    Donni A, Kitazawa H, Goto T, Nemoto Y, Keller Lukas

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   523 - 523   2007

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  • 20aWP-1 Ultrasonic Dispersion due to Rattling in Filled-skutterudite ROs_4Sb_<12>

    Nemoto Y, Watanabe H, Yasumoto Y, Goto T, Yanagisawa T, Takeda N, Ochiai A, Susawara H, Sato H

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   613 - 613   2007

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  • 18pPSA-51 Study of Quadrupolar Ordering and Quadrupole Kondo Effect in PrPb_3 and Pr_<0.98>La_<0.02>Pb_3 by Ultrasonic measurements

    Fukuura M, Jumonji S, Suzuki O, Nemoto Y, Goto T, Suzuki H. S, Sakakibara T

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   524 - 524   2007

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  • 19aPS-134 Ultrasonic Study of Vacancy Concentration in Silicon Crystal

    Sato Koji, Goto Terutaka, Yamada-Kaneta Hiroshi, Nemoto Yuichi, Suzuki Osamu, Hikin Masatoshi, Kakimoto Koichi, Nakamura Shintaro

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   587 - 587   2007

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  • 20aWP-12 Ultrasonic In vestigation of Quadrupolar Ordering in Clathrate Compound Ce_3Pd_<20>Si_6

    Watanabe T, Kobayashi H, Suzuki O, Nemoto Y, Goto T, Takeda N, Doenni Andreas, Kitazawa H

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   615 - 615   2007

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  • 21pPSA-76 Ultrasonic Study of Phase IV on Ce_<0.75>La_<0.25>B_6 under Uniaxial Pressures

    Akatsu M, Morie T, Sakakibara T, Nemoto Y, Goto T, Kunii S

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   566 - 566   2007

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  • 18pPSA-56 Ultrasonic investigation of quadrupolar effect for Non-Kramers Γ_3 doublet in PrMg_3

    Jumonji S, Fukuura M, Suzuki O, Nemoto Y, Goto T, Suzuki H. S, Tanida H, Takagi S

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   525 - 525   2007

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  • 18pPSA-32 Study of Quadrupolar Ordering in Filled Sukutterudite PrOs_4As_<12> and PrFe_4As_<12>

    Yasumoto Y, Henkie Z, Pietraszko A, Watanabe H, Yanagisawa T, Nemoto Y, Goto T, Yuhasz W. M, Sales T. A, Ho P.-C, Maple M. B

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   520 - 520   2007

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  • 22pTD-8 Electronic Orbital and Electric Quadrupole of Vacancy in Silicon

    Goto Terutaka, Yamada-Kaneta Hiroshi, Hikin Masatoshi, Nemoto Yuichi, Watanabe Hajime, Yanagisawa Tatsuya, Nakamura Shintaro

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   993 - 993   2007

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  • 19pXB-5 Ultrasonic observation of vacancy with electric quadrupole in crystalline silicon

    Goto Terutaka, Nakamura Shintaro, Yamada-Kaneta Hiroshi, Sato Koji, Hikin Masatoshi, Nemoto Yuichi, Suzuki Osamu, Tsuruta Kenji, Iyetomi Hiroshi, Kakimoto Koichi

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   957 - 957   2007

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  • 19pXB-4 Vacancy distribution in pulling-rate-varied CZ silicon crystal measured by low-temperature ultrasonic metod

    Yamada-Kaneta H, Nakamura S, Goto T, Sato K, Hikin M, Nemoto Y, Suzuki O, Tsuruta K, Iyetomi H, Kakimoto K

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   957 - 957   2007

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  • 22pTD-14 Distribution of vacancy concentration in device-oriented commercial-base silicon crystal observed by low-temperature ultrasonic measurements

    Yamada-Kaneta Hiroshi, Goto Terutaka, Hikin Masatoshi, Nemoto Yuichi, Nakamura Snintaro

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   995 - 995   2007

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  • 22pTD-9 The Study of Vacancy Concentration in CZ Silicon Crystal Using Ultrasonic Measurements

    Hikin Masatoshi, Goto Terutaka, Yamada-Kaneta Hiroshi, Nemoto Yuichi, Watanabe Hajime, Yanagisawa Tatsuya, Nakamura Shintaro

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   994 - 994   2007

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  • 21pPSB-33 Low-temperature magnetic phase diagram of Ce_3Pd_<20>Ge_6 studied by single crystal neutron diffraction

    Donni A, Kitazawa H, Nemoto Y, Goto T, Zaharko Oksana, Keller Lukas

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   580 - 580   2007

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  • 21pPSB-15 Ultrasonic Study of Off-center Rattling and Tunneling in The Filled Skutterudite LaOs_4Sb_<12>

    Yasumoto Y, Watanabe H, Yanagisawa T, Yamaguchi A, Nemoto Y, Goto T, Ochiai A

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   576 - 576   2007

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  • 21aXA-11 Ultrasonic Dispersion Due to Rattling in NdOs_4Sb_<12>

    Yanagisawa T, Yasumoto Y, Yamaguchi A, Nemoto Y, Goto T, Yuhasz William M, Ho Pei-Chun, Maple M.Brian

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   515 - 515   2007

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  • 21aXA-10 Rattling and Tunneling in Filled-skutterudite Compounds

    Nemoto Y, Yasumoto Y, Yamaguchi A, Yanagisawa T, Goto T, Takeda N, Ochiai A, Sugawara H, Sato H

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   515 - 515   2007

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  • 21pPSA-71 Ultrasonic Study of Electric Quadrupolar Effect in Clathrate Compounds R_3Pd_<20>Si_6 (R = Ce, Pr)

    Kobayashi H, Tsuduku S, Suzuki O, Nemoto Y, Goto T, Takeda N, Donni Andreas, Kitazawa H

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   565 - 565   2007

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  • 21aXA-13 NMR anomalies of 4a-site La in La_3Pd_<20>X_6(X=Ge, Si)

    Sasaki S, Doenni A, Kitazawa H, Hassan N, Sato S, Kaneko M, Kudo M, Kobayashi H, Nemoto Y, Goto T, Matsushita Y

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   516 - 516   2007

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  • 18pPSA-45 Rattling and quantum effect of the Filled Skutterudite Pr(Os_<1-x>Ru_x)_4Sb_<12> and ROs_4Sb_<12>(R=La,Nd) by using Ultrasonic Measurements

    Watanabe H, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Ochiai A, Yoshino K, Sugawara H, Sato H

    Meeting Abstracts of the Physical Society of Japan   62 ( 0 )   523 - 523   2007

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  • 極低温超音波計測による点欠陥性御CZシリコン結晶中の原子空孔濃度分布観測

    金田寛, 後藤輝孝, 佐藤幸治, 齋藤康治, 根本祐一, 柿本浩一, 中村慎太郎

    応用物理学会学術講演会講演予稿集   67th ( 1 )   387   2006.8

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  • 超音波によるFZシリコン結晶中原子空孔の電荷状態の観測

    後藤輝孝, 金田寛, 佐藤幸治, 齋藤康裕, 根本祐一, 昆金正敏, 柿本浩一, 中村慎太郎

    応用物理学会学術講演会講演予稿集   67th ( 1 )   387   2006.8

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  • Ultrasonic Investigation on Charge Fluctuation of Valence Fluctuation and Rattling Systems

    GOTO Terutaka, NEMOTO Yuichi

    Butsuri   61 ( 6 )   408 - 415   2006.6

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    Ultrasonic measurements of elastic constants and attenuation coefficients are employed to detect the charge fluctuation of valence fluctuation and off-center rattling systems, In the present review, we introduce the symmetry properties of the elastic strains associated with the ultrasonic waves. Then, we describe ultrasonic research on the valence fluctuation systems of Yb_4As_3 with charge ordering and of Sm_3X_4(X=Se, Te) with charge glass in emphasizing the group theoretical analysis for charge fluctuations in these systems. The recent progress of the rattling and tunneling of the off-center local oscillator in clathrate compounds R_3Pd_&lt;20&gt;Ge_6 (R=La, Ce) and PrOs_4Sb_&lt;12&gt; is also presented.

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  • Ultrasonic Investigation on Charge Fluctuation of Valence Fluctuation and Rattling Systems

    後藤輝孝, 根本祐一

    日本物理学会誌   61 ( 6 )   408 - 415   2006.6

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    Ultrasonic measurements of elastic constants and attenuation coefficients are employed to detect the charge fluctuation of valence fluctuation and off-center rattling systems, In the present review, we introduce the symmetry properties of the elastic strains associated with the ultrasonic waves. Then, we describe ultrasonic research on the valence fluctuation systems of Yb_4As_3 with charge ordering and of Sm_3X_4(X=Se, Te) with charge glass in emphasizing the group theoretical analysis for charge fluctuations in these systems. The recent progress of the rattling and tunneling of the off-center local oscillator in clathrate compounds R_3Pd_<20>Ge_6 (R=La, Ce) and PrOs_4Sb_<12> is also presented.

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  • Observation of low-temperature elastic softening due to vacancy in crystalline silicon

    T Goto, H Yamada-Kanetai, Y Saito, Y Nemoto, K Sato, K Kakimoto, S Nakamura

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 4 )   2006.4

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    In challenging a direct observation of the vacancy in crystalline silicon. we have carried out low-temperature ultrasonic measurements down to 20mK. The longitudinal elastic constants of non-doped and B-doped crystalline silicons, which were grown by a floating zone (FZ) method in commercial base, reveal the elastic softening proportional to the reciprocal temperature below 20 K. The applied magnetic fields turn the elastic softening of the B-doped FZ silicon to a temperature-independent behavior. while the fields up to 16T do not affect the elastic softening of the non-doped FZ silicon. We present a plausible scenario for this result. Namely the vacancy with the non-magnetic charge state V in the nondoped silicon and the magnetic V+ in the B-doped silicon is responsible for the low-temperature softening of the shear elastic constants (C-11-C-12)/2 and C-44, which can be described in terms of the quadrupole susceptibility due to the Jahn-Teller effect.

    DOI: 10.1143/JPSJ.75.044602

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  • 極低温超音波計測によるCZシリコン結晶中の原子空孔の観測

    金田寛, 後藤輝孝, 斎藤康裕, 根本祐一, 佐藤幸治, 柿本浩一, 中村慎太郎

    応用物理学関係連合講演会講演予稿集   53rd ( 1 )   434   2006.3

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  • 極低温超音波計測によるFZシリコン結晶中の原子空孔の観測

    後藤輝孝, 金田寛, 斎藤康裕, 根本祐一, 佐藤幸治, 柿本浩一, 中村慎太郎

    応用物理学関係連合講演会講演予稿集   53rd ( 1 )   434   2006.3

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  • 28pPSA-48 Quadrupolar Kondo effect in non-Kramers doublet system PrInAg_2

    Suzuki O., Suzuki H.S., Kitazawa H., Kido G., Ueno T., Yamaguchi T., Nemoto Y., Goto T.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   609 - 609   2006.3

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  • Magnetic properties of clathrate-like compound Pr3Pd20Ge6

    O Suzuki, H Kitazawa, G Kido, T Yamaguchi, Y Nemoto, T Goto

    JOURNAL OF ALLOYS AND COMPOUNDS   408   107 - 109   2006.2

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    The magnetic properties of clathrate-like compound Pr3Pd20Ge6 with the cubic C6Cr23-tYPC crystal structure have been investigated by magnetic susceptibility and magnetization measurements. The temperature dependence of magnetic susceptibility of Pr3Pr20Ge6 is quite isotropic regarding to the magnetic field direction and follows Curie-Weiss law above 2 K. The magnetization processes were reproduced by assuming that the crystal field ground states are doublet Gamma(3) in 4a-site and triplet Gamma(5) in 8c-site. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2005.04.116

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  • Quadrupolar Kondo effect in non-Kramers doublet system PrInAg2

    O Suzuki, HS Suzuki, H Kitazawa, G Kido, T Ueno, T Yamaguchi, Y Nemoto, T Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 1 )   2006.1

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    We performed ultrasonic measurement on the rare-earth intermetallic compound PrInAg2 to examine the quadrupolar Kondo effect associated with the non-Kramers Gamma(3) doublet ground state. The characteristic softening of the elastic constant (c(11)-c(12))/2 below 10 K in PrInAg2 is attributed to the Curie term in quadrupolar susceptibility for the quadrupole O-2(2) = J(x)(2) - J(y)(2) of the stable Gamma(3) ground state. (c(11) - c(12))/2 turns to a slight increase with the - In T dependence below 0.1 K, which suggests the quenching of the quadrupolar moment in the quadrupolar Kondo state. Under applied magnetic fields of 10T and 15T above 8.7T corresponding to the Kondo temperature T-K of similar to 0.86 K, the behavior of (c(11) - c(12))/2 is described in terms of quadrupolar susceptibility for the stable 4f(2) state.

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  • Quadrupolar Kondo effect in non-Kramers doublet system PrInAg2

    O Suzuki, HS Suzuki, H Kitazawa, G Kido, T Ueno, T Yamaguchi, Y Nemoto, T Goto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 1 )   2006.1

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    We performed ultrasonic measurement on the rare-earth intermetallic compound PrInAg2 to examine the quadrupolar Kondo effect associated with the non-Kramers Gamma(3) doublet ground state. The characteristic softening of the elastic constant (c(11)-c(12))/2 below 10 K in PrInAg2 is attributed to the Curie term in quadrupolar susceptibility for the quadrupole O-2(2) = J(x)(2) - J(y)(2) of the stable Gamma(3) ground state. (c(11) - c(12))/2 turns to a slight increase with the - In T dependence below 0.1 K, which suggests the quenching of the quadrupolar moment in the quadrupolar Kondo state. Under applied magnetic fields of 10T and 15T above 8.7T corresponding to the Kondo temperature T-K of similar to 0.86 K, the behavior of (c(11) - c(12))/2 is described in terms of quadrupolar susceptibility for the stable 4f(2) state.

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  • 27pSC-1 Physical properties of some rare earth compounds having the Shastry-Sutherland lattice

    Suzuki K, Ishihara M, Yanagisawa T, Nemoto Y, Goto T, Ohyama K, Yamaguchi Y, Duijn J.Van, Attfield J.P, Sato G, Mizuhashi T, Hataya T, Hara M, Watanuki R, Tamura H, Sakakibara T

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   429 - 429   2006

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  • 27pSC-2 Geometrical Quadrupolar Frustration in DyB_4

    Watanuki R, Ohoyama K, Yamaguchi Y, Mitamura H, Sakakibara T, Sato G, Suzuki K, Ishihara M, Yanagisawa T, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   429 - 429   2006

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  • Observation of vacancy in high purity silicon crystal using low-temperature ultrasonic measurements

    Terutaka Goto, Hiroshi Yamada-Kaneta, Yasuhiro Saito, Yuichi Nemoto, Koji Sato, Koichi Kakimoto, Shintaro Nakamura

    ECS Transactions   3 ( 4 )   375 - 385   2006

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    We have succeeded in direct observation of isolated vacancies in high purity silicon crystals grown by a floating zone (FZ) method using low-temperature ultrasonic measurements. The softening of elastic constants below 20 K down to 20 mK is observed in nondoped FZ silicon and B-doped FZ silicon. This softening is caused by an interaction of electric quadrupoles of triply degenerate vacancy orbital to elastic strains of ultrasonic waves. The lowtemperature elastic softening measured by ultrasonic methods verifies existence of the isolated vacancies in Pv-region distributed in pure crystal of a Czockralski ingot. The ultrasonic measurement of the low-temperature softening is a faithful probe for vacancy evaluation in high purity silicon crystals in commercial base. copyright The Electrochemical Society.

    DOI: 10.1149/1.2355772

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  • Raman scattering study of the guest ion motion in caged crystals

    Y. Takasu, T. Hasegawa, N. Ogita, M. Udagawa, M. A. Avila, K. Suekuni, T. Takabatake, T. Yamaguchi, T. Watanabe, Y. Nemoto, T. Goto, Z. Hiroi

    ICT'06: XXV INTERNATIONAL CONFERENCE ON THERMOELECTRICS, PROCEEDINGS   33 - +   2006

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    The guest ion motion has been investigated by Raman scattering for the following caged crystals: La3Pd20X6 (X=Ge, Si), X8Ga16Ge30 (X=Ba, Sr, Eu), and KOs2O6. The observed Raman peaks have been well assigned by the polarization dependence and the first principles calculation. It has been found that the energy of the guest ion anomalously decreases with decreasing temperature for X8Ga16Ge30, La3Pd20Ge6, and KOs2O6, where the rattling motion of the guest ion has been reported. However, such anomalous decrease has not been observed in La3Pd20Si6 (no rattling). The origin of the energy decrease is understood by the existence of the large quartic anharmonic potential. Furthermore, the existence of carriers is important for the rattling mode.

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  • 27pSC-3 Ultrasonic Study of Multipole Effect in DyB_4 and HoB_4

    Nemoto Y, Ishihara M, Yanagisawa T, Goto T, Watanuki R, Suzuki K

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   430 - 430   2006

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  • 27aUB-9 Raman scattering on La_3Pd_<20>X_6(X=Si,Ge)

    Hasegawa T, Takasu Y, Kondo T, Ogita N, Udagawa M, Yamaguchi T, Watanabe T, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   513 - 513   2006

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  • 23pPSA-8 Rattling of the filled skutterudite compound Pr(Os_<1-x>Ru_x)_4Sb_<12> and LaOs_4Sb_<12> by ultrasonic measurements

    Watanabe H, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Ochiai A, Yoshino K, Sugawara H, Sato H

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   408 - 408   2006

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  • 23pPSA-48 Ultrasonic Study of Rattling in Clathrate Compounds R_3Pd_<20> X_6 (X=Si, Ge)

    Watanabe T, Yamaguchi T, Nemoto Y, Goto T, Takeda N, Suzuki O, Kitazawa H

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   417 - 417   2006

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  • 24aPS-98 Elastic Softening Associated with Single Vacancy in Crystalline Silicon

    Sato Koji, Goto Terutaka, Yamada-Kaneta Hiroshi, Saito Yasuhiro, Nemoto Yuichi, Kakimoto Koichi, Nakamura Shintaro

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   463 - 463   2006

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    DOI: 10.1143/jpsj.75.044602

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  • 27aUE-11 Direct observation of vacancies in commercial-base silicon crystals using low-temperature ultrasonic measurement

    Yamada-Kaneta Hiroshi, Goto Terutaka, Saito Yasuhiro, Nemoto Yuichi, Sato Koji, Kakimoto Koichi, Nakamura Shintaro

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   2006

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  • 25pYA-10 NMR study on clathrate compound La_3Pd_<20>Ge_6 II

    Harada J, Kaneko M, S. Shinya, Watanabe S, Sasaki S, Nemoto Y, Goto T, Suzuki O, Kitazawa H

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   499 - 499   2006

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  • 28pPSA-47 Ultrasonic measurements of heavy fermion superconductivity CeIrIn_5

    Ito H, Yanagisawa T, Nemoto Y, Goto T, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   609 - 609   2006

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  • 28aUF-9 Magneto-acoustic birefringence of filled skutterudite PrOs_4Sb_<12> with T_h symmetry

    Ueno T, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Sugawara H, Sato H

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   578 - 578   2006

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  • 28pPSA-50 Ultrasonic investigation of antiferro-quadrupolar ordering in PrPb_3

    Jumonji S, Nemoto Y, Goto T, Onimaru T, Sakakibara T, Suzuki H

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   610 - 610   2006

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  • 28pPSA-49 Ultrasonic investigation of quadrupolar ordering and quadrupolar Kondo effect in La-diluted system Pr_<1-x>La_xPb_3(x=0.02)

    Fukuura M, Jyumonji S, Nemoto Y, Goto T, Suzuki H, Sakakibara T

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   609 - 609   2006

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  • 27aUE-12 Observation of Jahn-Teller effect due to vacancy in crystalline silicon using ultrasonic low-temperature measurements

    Goto Terutaka, Yamada-Kaneta Hiroshi, Saito Yasuhiro, Nemoto Yuichi, Sato Koji, Kakimoto Koichi, Nakamura Shintaro

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   517 - 517   2006

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  • 25pYA-9 High-resolution Raman scattering measurement on La_3Pd_<20>X_6(X=Si,Ge)

    Hasegawa T, Takasu Y, Kondo T, Ogita N, Udagawa M, Yamaguchi T, Watanabe T, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   499 - 499   2006

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  • 28pPSA-17 Crystalline Electric Fields and rattling of the filled skutterudite compound Pr(Os_<1-x>Ru_x)_4Sb_<12> by ultrasonic measurements

    Watanabe H, Ueno T, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Sugawara H, Sato H

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   601 - 601   2006

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  • 23pPSA-47 The study of quadrupolar effect on Pr_<1-x>La_xPb_3 using ultrasonic measurements

    Fukuura M, Jumonji S, Nemoto Y, Goto T, Suzuki H.S, Sakakibara T

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   417 - 417   2006

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  • 27aPS-89 Ultrasonic measurements of charge states associated with vacancy in crystalline silicon

    Saito Y, Goto T, Nemoto Y, Sato K, Yamada-Kaneta H, Kakimoto K, Nakamura S

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   541 - 541   2006

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  • 28pPSA-51 Magnetic Phase Diagram of Ce_xLa_<1-x>B_6 in High Magnetic Fields

    Kazama N, Nemoto Y, Goto T, Akatsu M, Suzuki O, Kido G, Nakamura S, Kunii S

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   610 - 610   2006

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  • 超音波で見える強相関量子系の物理―シリコン結晶の原子空孔直接観測―

    根本祐一, 後藤輝孝, 金田寛, 斎藤康裕, 佐藤幸治, 柿本浩一, 中村慎太郎

    NSL News Lett   ( 2006-2 )   5   2006

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  • 25aYA-5 Elastic Constant of Filled Skutterudite PrOs_4As_<12>

    Yuhasz W.M, Maple M.Brian, Henkie Z, Pietraszko A

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   483 - 483   2006

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  • 28pPSA-52 Crystalline-field Effect in Clathrate Compounds Ce_3Pd_<20>Si_6 by Ultrasonic Measurements

    Watanabe T, Yamaguchi T, Nemoto Y, Goto T, Takeda N, Suzuki O, Kitazawa H

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   610 - 610   2006

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  • 23pPSA-46 Ultrasonic investigation of quadrupolar effect in PrX_3 (X=Pb, Mg)

    Jumonji S, Nemoto Y, Goto T, Suzuki H.S, Tanida H, Onimaru T, Sakakibara T

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   417 - 417   2006

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  • La<sub>3</sub>Pd<sub>20</sub>X<sub>6</sub>(X=Si,Ge)のラマン散乱

    長谷川巧, 高須雄一, 近藤歳久, 荻田典男, 宇田川眞行, 山口隆, 渡辺智行, 根本祐一, 後藤輝孝

    NSL News Letter   ( 2006-2 )   17   2006

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  • カゴ状希土類化合物R<sub>3</sub>Pd<sub>20</sub>X<sub>6</sub>(X=Ge,Si)の中性子散乱研究

    DOENNI Andreas, 北澤英明, 後藤輝孝, 根本祐一, KELLER Lukas

    日本中性子科学会年会講演概要集   6th   79   2006

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  • Geometrical quadrupolar frustration in DyB$_4$

    Ryuta Watanuki, Gou Sato, Kazuya Suzuki, Masaki Ishihara, Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto

    Journal of the Physical Society of Japan   74   2169 - 2172   2005.6

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    Physical properties of DyB$_4$ have been studied by magnetization, specific
    heat, and ultrasonic measurements. The magnetic entropy change and the
    ultrasonic properties in the intermediate phase II indicate that the degeneracy
    of internal degrees of freedom is not fully lifted in spite of the formation of
    magnetic order. The ultrasonic attenuation and the huge softening of $C_{44}$
    in phase II suggests existence of electric-quadrupolar (orbital) fluctuations
    of the 4$f$-electron. These unusual properties originate from the geometrical
    quadrupolar frustration.

    DOI: 10.1143/JPSJ.74.2169

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  • Dilatometric measurements and multipole ordering in DyB2C2 and HoB2C2

    T Yanagisawa, T Moriwaki, Y Nemoto, T Goto, R Watanuki, K Suzuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 6 )   1666 - 1669   2005.6

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    We have performed dilatometric measurements by the capacitance method on tetragonal rare earth compounds DyB2C2 and HoB2C2 that show anti ferro-quadrupole (AFQ) ordering. The tetragonal structure is invariant across the paramagnetic phase to the AFQ phase at T-Q = 24.7 K in DyB2C2. In the case of intermediate phase IV of HoB2C2, between T-C1, = 5.9 K and T-C2 = 5.0 K, the lattice length along the [101] direction reveals an abrupt increase, while the lengths along the [100] and [110] directions shrink slightly. This lattice distortion is described in terms of triclinic strain epsilon(yz) = epsilon(zx) not equal 0 indicating the spontaneous ferro-quadrupole moment &lt; O-yz &gt; = &lt; O-zx &gt; not equal 0. A plausible model, based on an octupole ordering &lt; T-x &gt; = &lt; T-y &gt; = &lt; T-z &gt; not equal 0, in phase IV of HoB2C2, is argued.

    DOI: 10.1143/JPSJ.74.1666

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  • Quadrupole fluctuation and off-center rattling motion in heavy fermion superconductor PrOs4Sb12

    T Goto, Y Nemoto, K Sakai, K Onuki, T Yamaguchi, M Akatsu, T Yanagisawa, H Sugawara, H Sato

    PHYSICA B-CONDENSED MATTER   359   822 - 826   2005.4

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    We have made ultrasonic measurements on a filled skutterudite PrOs4Sb12 showing a heavy Fermion superconductivity at T-C = 1.85 K. The elastic constants (C-11 - C-12)/2 and C-44 of PrOs4Sb12 exhibit low-temperature softenings below 20 K down to T-C, indicating a quadrupole fluctuation of Pr3+ ion. A minimum of (C-11 - C-12)/2 in magnetic fields along the [1 1 0] direction around 8 T shows a level crossing of one of a excited Gamma(4)((2)) triplet to a ground state Gamma(1) singlet. An ultrasonic dispersion in (C-11 - C-12)/2 around 30 K suggests a thermally activated off-center rattling of Pr ion in a cage of Sb-icosahedron. The observed relaxation time shows the Arrhenius-type temperature dependence tau = tau(0) exp(E/k(B)T) with an attempt time tau(0) = 8.8 x 10(-11) s and an activation energy E = 168 K. The charge fluctuation of the off-center motion and the quadrupole fluctuation of the 4f electron may participate in the formation of the heavy fermion and the superconductivity in PrOs4Sb12. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2005.01.241

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  • Magnetic anisotropy of antiferro-quadrupole ordering in tetragonal HoB2C2

    T Yanagisawa, T Goto, Y Nemoto, R Watanuki, K Suzuki, O Suzuki, G Kido

    PHYSICA B-CONDENSED MATTER   359   959 - 961   2005.4

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    Elastic properties of tetragonal HoB2C2 showing anti ferro-quadrupole (AFQ) ordering have been investigated by means of ultrasonic measurements. An anisotropic RKKY interaction would be responsible for the AFQ phase II of HoB2C2, which has an anisotropic field-temperature (H-T) phase diagram. We succeeded in obtaining the H T phase diagram for H parallel to [001] by using a hybrid magnet up to 30 T in NIMS, and found the presence of AFQ phase II over 4 T for H parallel to [001] in HoB2C2. The critical magnetic field H-C[001] = 26.3 T suggests a distinct stability of AFQ phase II in fields along the principal axis by contrast with relatively unstable behavior under fields H-C[110] = 3.9 T and H-C[100] = 2.0 T in basal plane. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2005.01.276

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  • Lattice distortion and spontaneous Gamma(5g) ferro-quadrupole moment in phase IV of CexLa1-xB6

    Y Nemoto, M Akatsu, T Goto, O Suzuki, S Nakamura, S Kunii

    PHYSICA B-CONDENSED MATTER   359   956 - 958   2005.4

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    We have performed low-temperature thermal expansion measurements to investigate lattice effect of the phase IV in CexLa1-xB6, for x = 0.75 and 0.70. In phase IV of both compounds, lattice length along the [111] direction shrinks notably, on the other hand length along the [001] direction expands. These results provide evidence that the spontaneous Gamma(5g) ferro-quadrupole moment &lt; O-yz&gt; = &lt; O-zx&gt; = &lt; O-xy&gt; not equal 0 is relevant in phase IV because the trigonal lattice distortion is described by the symmetry strain &lt;epsilon(yz)&gt; = &lt;epsilon(zx)&gt; = &lt;epsilon(xy)&gt; not equal 0 simultaneously. (c) 2005 Elsevier B.V. All rights reserved.

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  • Tunneling and rattling of clathrate crystals Ce3Pd20Ge6 and La3Pd20Ge6

    T Yamaguchi, Y Nemotoa, T Goto, M Akatsu, T Yanagisawa, O Suzuki, H Kitazawa, T Komatsubara

    PHYSICA B-CONDENSED MATTER   359   296 - 298   2005.4

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    We have made ultrasonic measurements on clathrate crystals Ce3Pd20Ge6 and La3Pd20Ge6 with a cage filled by a rare-earth atom. The elastic constants C-44 of both compounds show a marked dependence in ultrasonic frequencies of 10-300 MHz around 10-30 K, which are caused by a thermally activated rattling of the off-center rare-earth ion in the cage over the potential hill. At low temperatures below 3 K down to 20 mK, C-44 of La3Pd20Ge6 without 4f-electron exhibits a softening proportional to 1/T, which indicates a tunneling of the off-center rare-earth ion in the cage through the potential hill. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2005.01.112

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  • Antiferro-quadrupole ordering of CexLa1-xB6 under high magnetic fields

    M Akatsu, O Suzuki, Y Nemoto, T Goto, S Nakamura, S Kunii, G Kido

    PHYSICA B-CONDENSED MATTER   359   962 - 964   2005.4

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    We have investigated the magnetic phase diagrams for anti ferro-quadrupole (AFQ) phase II in CexLa1-xB6 by ultrasonic measurements under high magnetic fields up to 30 T by using the hybrid-magnet (Gama) at National Institute for Materials Science in Tsukuba. Ce0.50La0.50B6 reveals that the AFQ phase boundary in applied magnetic fields along the [0 01] direction closes at about 29 T and the boundaries in fields along the [110] and [111] directions are still open even at 30 T. The AFQ phase transition temperature in Ce0.75La0.25B6 shows maximum at about 25 T in H parallel to [001]. These experimental results support the idea that the multipole RKKY-type inter-site interaction of the quadrupoles O-yz, O-zx, O-xy and the field-induced octupole T-xyz play an important role in the highly anisotropic magnetic phase diagram of phase II of CexLa1-xB6 in high magnetic fields. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2005.01.277

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  • Elastic properties and magnetic phase diagrams of dense Kondo compound Ce0.75La0.2B6

    O Suzuki, S Nakamura, M Akatsu, Y Nemoto, T Goto, S Kunii

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 2 )   735 - 741   2005.2

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    We have investigated the elastic properties of the cubic dense Kondo compound Ce0.75La0.25B6 by means of ultrasonic measurements. We have obtained magnetic fields vs temperatures (H-T) phase diagrams under magnetic fields along the crystallographic [001], [110] and [111] axes. An ordered phase IV showing the elastic softening of c(44) locates in low temperature region between 1.6 and 1.1 K below 0.7T in all field directions. The phase IV shows an isotropic nature with regard to the field directions, while the anti ferro-magnetic phase III shows an anisotropic character. A remarkable softening Of C-44 and a spontaneous trigonal distortion epsilon(yz) + epsilon(zy) + epsilon(xy) recently reported by Akatsu et al. [J. Phys. Soc. Jpn. 72 (2003) 205] in the phase TV favor a ferro-quadrupole (FQ) moment of O-yz + O-zx + O-xy induced by an octupole ordering.

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  • Magnetic phase diagram of antiferroquadrupole ordering in HoB2C2

    Tatsuya Yanagisawa, Terutaka Goto, Yuichi Nemoto, Ryuta Watanuki, Kazuya Suzuki, Osamu Suzuki, Giyuu Kido

    Physical Review B - Condensed Matter and Materials Physics   71   2005.1

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    The magnetic phase diagram for antiferro-quadrupole (AFQ) ordering in
    tetragonal HoB$_2$C$_2$ has been investigated by measurements of elastic
    constants $C_{11}$, $C_{44}$ and $C_{66}$ in fields along the basal $x$-$y$
    plane as well as the principal [001]-axis. The hybrid magnet (GAMA) in Tsukuba
    Magnetic Laboratory was employed for high field measurements up to 30 T. The
    AFQ phase is no longer observed above 26.3 T along the principal [001] axis in
    contrast to the relatively small critical field of 3.9 T in fields applied
    along the basal [110] axis. The quadrupolar intersite interaction of $O_{xy}$
    and/or $O_2^2$ is consistent with the anisotropy in the magnetic phase diagram
    of the AFQ phase in HoB$_2$C$_2$.

    DOI: 10.1103/PhysRevB.71.104416

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  • Elastic constant in magnetic fields and singlet-triplet state of heavy fermion superconductor PrOS4Sb12

    T Goto, Y Nemoto, K Onuki, K Sakai, T Yamaguchi, M Akatsu, T Yanagisawa, H Sugawara, H Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 1 )   263 - 266   2005.1

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    We have made ultrasonic measurements on a filled skutterudite PrOs4Sb12 showing a heavy fermion superconductivity at T-C = 1.85 K. The softening of the elastic constant with decreasing temperature has been found above T-C. The (C-11 - C-12)/2 in applying magnetic fields along the [110] axis at 1.0 K exhibits a minimum around 8 T, which is well accounted for by the one-ion quadrupolar susceptibility reflecting the level crossing of one of an excited Gamma(4)((2)) triplet to a ground state Gamma(1) singlet. The softening of (C-11 - C-12)/2 proportional to reciprocal temperature just above T-C may be dominated by the tunneling of an off-center Pr-ion in an Sb-icosahedron cage.

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  • 19pPSA-17 Quadrupole effect and rattling of the filled skutterudite compound Pr(Os_<1-X>Ru_X)_4Sb_<12> by ultrasonic measurements

    Ueno T, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Sugawara H, Sato H

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   397 - 397   2005

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  • 21aYG-9 dHvA effect and physical properties at low temperatures in PrInAg_2

    Suzuki H. S, Suzuki O, Konoike T, Enomoto K, Yamaguchi T, Terashima T, Uji S, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   474 - 474   2005

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  • 19pPSA-83 Ultrasonic attenuation of Ce_xLa_<1-x>B_6 in phase IV

    Kazama N, Nemoto Y, Goto T, Akatsu M, Suzuki O, Nakamura S, Kunii S

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   413 - 413   2005

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  • 19pPSA-84 Ultrasonic measurements of antiferro-quadrupolar ordering in PrPb_3

    Jumonji S, Nemoto Y, Goto T, Onimaru T, Sakakibara T, Suzuki H

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   414 - 414   2005

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  • 19pPSA-37 Raman scattering on La_3Pd_<20>Ge_<6>

    Hasegawa T, Takasu Y, Kondo T, Ogita N, Udagawa M, Yamaguchi T, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   402 - 402   2005

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  • 19pPSA-51 Ultrasonic measurements of heavy fermion superconductivity CeIrIn_5

    Ito H, Yanagisawa T, Nemoto Y, Goto T, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   405 - 405   2005

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  • 19aYG-10 Ultrasonic Dispersion Due to the Ratling Motion in the Filled Skutterudite La(Os_<0.5>Ru_<0.5>)_4Sb_<12>

    Yanagisawa T, Yuhasz W. M, Maple M. B, Ueno T, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   363 - 363   2005

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  • 25aPS-45 Quadrupole effect and rattling of the filled skutterudite compound PrOs_4Sb_<12> by ultrasonic measurements

    上野 高文, 山口 隆, 根本 祐一, 後藤 輝孝, 武田 直也, 菅原 仁, 佐藤 英行

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   532 - 532   2005

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  • 19aYG-9 Ultrasonic Dispersion and Rattling in Heavy Fermion Superconductor PrOs_4Sb_<12> and the diluted system Pr(Os_<1-x>Ru_x)_4Sb_<12>

    Nemoto Y, Ueno T, Takeda N, Yanagisawa T, Goto T, Sugawara H, Sato H

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   362 - 362   2005

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  • 26pYS-1 Rattling and tunneling in clathrate compounds

    Goto T, Satoh H, Yamaguchi T, Nemoto Y, Ueno T, Yanagisawa T, Takeda N, Suzuki O, Kitazawa H, Sugawara H

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   2005

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  • 26pYS-1 Rattling and tunneling in clathrate compounds

    Goto T, Satoh H, Yamaguchi T, Nemoto Y, Ueno T, Yanagisawa T, Takeda N, Suzuki O, Kitazawa H, Sugawara H

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   925 - 925   2005

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  • 25pTA-8 Ultrasonic Attenuation and Rattling in Heavy Fermion Superconductor PrOs_4Sb_<12>

    Nemoto Y, Ueno T, Yamaguchi T, Yanagisawa T, Goto T, Takeda N, Sugawara H, Satoh H

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   550 - 550   2005

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  • 25pPSA-78 Ultrasonic measurements of superconductivity in rare earth hexaboride YB_6

    Ito H, Yamaguchi T, Nemoto Y, Goto T, Akatsu M, Kunii S

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   579 - 579   2005

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  • 25aPS-85 Elastic anomalyf of antiferro-quadrupolar ordering in PrPb_3

    Jumonji S, Nemoto Y, Goto T, Onimaru T, Sakakibara T, Suzuki H

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   542 - 542   2005

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  • 25aPS-86 Elastic constant of Ce_xLa_<1-x>B_6 in High Magnetic Fields

    Kazama N, Nemoto Y, Goto T, Akatsu M, Suzuki O, Kido G, Nakamura S, Kunii S

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   542 - 542   2005

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  • 25aPS-53 Ultrasonic measurements of exotic magnetic ordering in RRh_3B_2

    Funaki T, Saito Y, Yamaguchi T, Nemoto Y, Goto T, Obiraki Y, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   534 - 534   2005

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  • 25aPS-84 Quadrupole Ordering in RB_4(R=Dy, Ho)

    Ishihara M, Jumonji S, Yanagisawa T, Nemoto Y, Goto T, Watanuki R, Sakakibara T, Suzuki K

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   542 - 542   2005

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  • 25aPS-46 The study of off-center rattling and tunneling in rare-earth clathrate compound R_3Pd_<20>Ge_6

    Yamaguchi T, Ueno T, Nemoto Y, Goto T, Suzuki O, Kitazawa H, Takeda N, Ishikawa M, Karaki Y

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   532 - 532   2005

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  • 24pWE-11 Observation of disappearance of orbital degeneracy in PrInAg_2 at low temperature by utirasonic measurements

    Suzuki O, Suzuki H, Ueno T, Yamaguchi T, Nemoto Y, Goto T, Kitazawa H, Kido G

    Meeting Abstracts of the Physical Society of Japan   60 ( 0 )   503 - 503   2005

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  • Association between neuroleptic drug-induced extrapyramidal symptoms and dopamine D2-receptor polymorphisms in Japanese schizophrenic patients

    Y. Nakazono, H. Abe, H. Murakami, N. Koyabu, Y. Isaka, Y. Nemoto, S. Murata, Y. Tsutsumi, H. Ohtani, Y. Sawada

    International Journal of Clinical Pharmacology and Therapeutics   43 ( 4 )   163 - 171   2005

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    The aim of the present study is to examine the relationship between dopamine D2-receptor gene (DRD2) polymorphisms (Taq1A, Taq1B, -141C Ins/Del) and the risk of extrapyramidal adverse effects (EPS), assessed according to the Drug-Induced Extra-Pyramidal Symptoms Scale (DIEPSS), or the maintenance dose of antipsychotics in schizophrenic patients. The DIEPSS score was significantly higher in patients bearing the -141C Del allele than in those without it. Taq1A and Taq1B restriction fragment length polymorphisms (RFLPS) did not significantly affect the DIEPSS score. On the other hand, maintenance doses of neuroleptics and antiparkinsonian drugs were significantly higher in patients with the B1 allele of Taq1B RFLP than in those without it, while the Taq1A RFLP and -141C Ins/Del polymorphisms were not significantly related to the maintenance doses. In conclusion, the risk of EPS may be increased in patients with the -141C Del allele of the DRD2 gene. In these patients, antipsychotics should be administered with caution. ©2005 Dustri-Verlag Dr. K. Feistle.

    DOI: 10.5414/CPP43163

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  • Magnetic anisotropy of the antiferroquadrupole phase in Ce0.50La0.50B6

    M Akatsu, T Goto, O Suzuki, Y Nemoto, S Nakamura, S Kunii, G Kido

    PHYSICAL REVIEW LETTERS   93 ( 15 )   2004.10

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    Magnetic phase diagrams for antiferroquadrupole (AFQ) phase II and antiferromagnetic (AFM) phase III in Ce0.50La0.50B6 with a Gamma(8) ground state have been investigated by ultrasonic measurements. The hybrid magnet (Gama) in the National Institute for Materials Science was employed for high-field measurements up to 30 T and a He-3-He-4 dilution refrigerator was used for low-temperature experiments down to 20 mK. The phase boundary from paramagnetic phase I to AFQ phase II under [001] magnetic fields closes at H(I-II)similar to29 T, while the boundary is still open under fields along the [110] and [111] directions even up to 30 T. This anisotropic character of phase II in fields is consistent with the theoretical calculation based on the O-xy-type AFQ ordering. We also found that AFM phase III reduces considerably in fields turning from the [001] to [110] and [111] directions.

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  • Tunneling and rattling in clathrate crystal

    Terutaka Goto, Yuichi Nemoto, Takashi Yamaguchi, Mitsuhiro Akatsu, Tatsuya Yanagisawa, Osamu Suzuki, Hideaki Kitazawa

    Physical Review B - Condensed Matter and Materials Physics   70   1 - 5   2004.9

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    We present tunneling and rattling motions of an off-center guest atom in cage
    referring to a clathrate crystal La_3Pd_{20}Ge_6. The elastic constant C_{44}
    of La_3Pd_{20}Ge_6 shows a Debye-type dispersion around 20 K obeying a
    relaxation time tau = tau_0exp(E/k_{B}T) with an attempt time tau_0 =
    2.0*10^{-12} sec and an activation energy E = 197 K. At low temperatures below
    3 K down to 20 mK, the C_{44} shows a softening of C_{44} =
    C_{44}^0(T-T_C^0)/(T-Theta) with T_C^0 = -337.970 mK and Theta = -338.044 mK.
    These facts are attributed to two different types of the off-center motions
    with Gamma_5 symmetry in 4a-site cage of La_3Pd_{20}Ge_6, a thermally activated
    rattling motion over the potential hill and a tunneling motion through the
    potential hill at low temperatures.

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  • Quadrupolar effect and rattling motion in heavy fermion superconductor PrOs_4Sb_{12}

    Terutaka Goto, Yuichi Nemoto, Kazuhiro Sakai, Takashi Yamaguchi, Mitsuhiro Akatsu, Tatsuya Yanagisawa, Hirofumi Hazama, Kei Onuki, Hitoshi Sugawara, Hideyuki Sato

    Physical Review B - Condensed Matter and Materials Physics   69   2004.4

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    The elastic properties of a filled skutterudite PrOs_4Sb_{12} with a heavy
    Fermion superconductivity at T_C=1.85 K have been investigated. The elastic
    softening of (C_{11}-C_{12})/2 and C_{44} with lowering temperature down to T_C
    indicates that the quadrupolar fluctuation due to the CEF state plays a role
    for the Cooper paring in superconducting phase of PrOs_4Sb_{12}. A Debye-type
    dispersion in the elastic constants around 30 K revealed a thermally activated
    Gamma_{23} rattling due to the off-center Pr-atom motion obeying
    tau=tau_{0}exp(E/k_{B}T) with an attempt time tau_0=8.8*10^{-11} sec and an
    activation energy E=168 K. It is remarkable that the charge fluctuation of the
    off-center motion with Gamma_{23} symmetry may mix with the quadrupolar
    fluctuation and enhance the elastic softening of (C_{11}-C_{12})/2 just above
    T_C.

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  • Lattice effects of orbital and charge orderings in the perovskite manganite Pr<inf>1-x</inf>Ca<inf>x</inf>MnO<inf>3</inf>

    Hirofumi Hazama, Terutaka Goto, Yuichi Nemoto, Yasuhide Tomioka, Atsushi Asamitsu, Yoshinori Tokura, Yoshinori Tokura

    Physical Review B - Condensed Matter and Materials Physics   69   644061 - 644069   2004.2

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    We have made ultrasonic measurements of Pr1-xCaxMnO3(x=0.35,0.40,0.50) with the colossal magnetoresistance in order to investigate the lattice effects due to orbital and charge degrees of freedom in the systems. As a result, we observe three types of elastic softening. The first one is the softening of (C11-C12)/2 in the x=0.35, 0.40, and 0.50 compounds above the charge-ordering point Tco, which originates from the interaction of the quadrupoles O20and O22with Γ3symmetry of egorbital in Mn3+ions to elastic strains. The second one is the softening of C44in the x=0.50 just above Tco, which is caused by a coupling of the charge-fluctuation mode with Γ5symmetry in the coexistence ratio N(Mn3+): N(Mn4+)=1:1 to the appropriate elastic strain. Employing a group-theoretical analysis based on the Landau theory for the phase transition, we have successfully deduced the Qxy-type charge-fluctuation mode with Γ5symmetry for the order parameter below Tco, there being alternative alignment on Mn3+and Mn4+ions in a-c (x-y) plane and the same arrangement along b(z) direction. The last one is the softening of (C11- C12)/2 just above Tcodue to the charge fluctuation.

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  • Lattice effects of orbital and charge orderings in the perovskite manganite Pr1-xCaxMnO3

    H Hazama, T Goto, Y Nemoto, Y Tomioka, A Asamitsu, Y Tokura

    PHYSICAL REVIEW B   69 ( 6 )   2004.2

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    We have made ultrasonic measurements of Pr1-xCaxMnO3 (x=0.35,0.40,0.50) with the colossal magnetoresistance in order to investigate the lattice effects due to orbital and charge degrees of freedom in the systems. As a result, we observe three types of elastic softening. The first one is the softening of (C-11-C-12)/2 in the x=0.35, 0.40, and 0.50 compounds above the charge-ordering point T-co, which originates from the interaction of the quadrupoles O-2(0) and O-2(2) with Gamma(3) symmetry of e(g) orbital in Mn3+ ions to elastic strains. The second one is the softening of C-44 in the x=0.50 just above T-co, which is caused by a coupling of the charge-fluctuation mode with Gamma(5) symmetry in the coexistence ratio N(Mn3+):N(Mn4+)=1:1 to the appropriate elastic strain. Employing a group-theoretical analysis based on the Landau theory for the phase transition, we have successfully deduced the Q(xy)-type charge-fluctuation mode with Gamma(5) symmetry for the order parameter below T-co, there being alternative alignment on Mn3+ and Mn4+ ions in a-c (x-y) plane and the same arrangement along b(z) direction. The last one is the softening of (C-11-C-12)/2 just above T-co due to the charge fluctuation.

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  • 28aPS-100 Ultrasonic measurements of Rare earth hexaborides YB_6

    Ito H, Akatu M, Yamaguchi T, Nemoto Y, Goto T, Kunii S

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   578 - 578   2004

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  • 14pPSB-21 NMR study on clathrate compound La_3Pd_<20>Ge_6

    Sasaki S, Ono T, Hoshino T, Watanabe S, Yamaguchi T, Nemoto Y, Goto T, Suzuki O, Kitazawa H

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   568 - 568   2004

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  • 14pPSB-24 Elastic anomaly of tetragonal RB_4(R=Dy, Ho) due to antiferro-magnetic ordering

    Ishihara M, Yanagisawa T, Nemoto Y, Goto T, Watanuki R, Sakakibara T, Suzuki K

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   568 - 568   2004

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  • 14pPSA-26 Ultrasonic measurements of exotic ferromagnetic ordering in CeRh_3B_2

    Funaki T, Yamaguchi T, Nemoto Y, Goto T, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   550 - 550   2004

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  • 14pPSA-78 Elastic anomaly of antiferro-quadrupolar ordering in PrPb_3

    Jumonji S, Nemoto Y, Goto T, Onimaru T, Sakakibara T, Suzuki H

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   562 - 562   2004

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  • 14aRC-11 Magnetic and ground state properties of Pr_3Pd_<20>Ge_6

    Suzuki O, Suzuki H, Kido G, Ueno T, Yamaguchi T, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   522 - 522   2004

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  • 14aRC-12 Ultrasonic attenuation and anomalous properties at low temperature due to off-center motion in clathrate compound R_3Pd_<20>Ge_6

    Yamaguchi T, Ueno T, Nemoto Y, Goto T, Suzuki O, Kitazawa H, Takeda N, Ishikawa M

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   522 - 522   2004

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  • 30aXE-4 Magnetic field dependence of the elastic constant and rattling in PrOs_4Sb_<12>

    Nemoto Y, Sakai K, Onuki K, Yamaguchi T, Goto T, Sugawara H, Sato H

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   645 - 645   2004

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  • 30pXD-4 Magnetic Properties and Quadrupolar ordering of DyB_4.

    Watanuki R, Sato G, Suzuki K, Ohoyama K, Yamaguchi Y, Ishihara M, Yanagisawa T, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   651 - 651   2004

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  • 28pPSA-56 Ultrasonic absorption of rattling in clathrate compound La_3Pd_<20>Ge_6

    Yamaguchi T, Nemoto Y, Akatsu M, Yanagisawa T, Goto T, Suzuki O, Kitazawa H, Kido G

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   615 - 615   2004

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  • 30aXD-9 Magnetic anisotropy of AFQ ordering phase on tetragonal DyB_2C_2 and HoB_2C_2

    Yanagisawa T, Moriwaki T, Goto T, Nemoto Y, Watanuki R, Suzuki K, Suzuki O, Kido G

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   644 - 644   2004

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  • 28pPSA-36 Magnetic field dependence(C_<11>-C_<12>)/2 and crystal field in heavy fermion superconductor PrOs_4Sb_<12>

    Goto T, Onuki K, Sakai K, Nemoto Y, Yamaguchi T, AKatu M, Yanagisawa T, Sugawara H, Sato H

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   610 - 610   2004

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  • 28pPSA-51 Large elastic anomaly of tetragonal DyB_4 due to antiferro-magnetic ordering

    Ishihara M, Yanagisawa T, Nemoto Y, Goto T, Watanuki R, Satou G, Mizuhashi T, Suzuki K

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   614 - 614   2004

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  • 14pPSA-55 Quadrupole effect of the filled skutterudite compound CeRu_4Sb_<12> and PrOs_4Sb_<12> by ultrasonic measurements

    Ueno T, Yamaguchi T, Nemoto Y, Goto T, Takeda N

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   557 - 557   2004

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  • 12aRC-10 Spontaneous Strain and Multipoler Ordering in Phase IV of HoB_2C_2

    Yanagisawa T, Goto T, Nemoto Y, Watanuki R, Suzuki K

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   423 - 423   2004

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  • 12aRC-11 Order Parameter in the AFQ ordering system, PrPb_3

    Onimaru T, Suzuki H, Jumonji N, Nemoto Y, Goto T, Sakakibara T, Tayama T, Aoki D, Onuki Y, Kitai T, Kawae T

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   423 - 423   2004

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  • 13aPS-119 Ultrasonic measurements of superconductivity in rare earth hexaboride YB_6

    Ito H, Yamaguchi T, Nemoto Y, Goto T, Akatsu M, Kunii S

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   488 - 488   2004

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  • 12aRC-1 Magnetic Phase Diagram of Antiferro-quadrupole Ordering of Ce_xLa_<1-x>B_6 in High Magnetic Fields

    Akatsu M, Suzuki O, Kazama N, Nemoto N, Goto T, Nakamura S, Kunii S, Kido G

    Meeting Abstracts of the Physical Society of Japan   59 ( 0 )   420 - 420   2004

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  • Ferroquadrupole ordering and Gamma_5 rattling motion in clathrate compound Ce_3Pd_20Ge_6

    Yuichi Nemoto, Takashi Yamaguchi, Takenobu Horino, Mitsuhiro Akatsu, Tatsuya Yanagisawa, Terutaka Goto, Osamu Suzuki, Andreas Donni, Takemi Komatsubara

    Physical Review B - Condensed Matter and Materials Physics   68   2003.10

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    Lattice effects in a cerium based clathrate compound Ce_3Pd_20Ge_6 with a
    cubic Cr_23C_6-type structure have been investigated by ultrasonic and thermal
    expansion measurements. Elastic softenings of (C_11-C_12)/2 and C_44
    proportional to the reciprocal temperature 1/T above T_Q1 = 1.25 K are well
    described in terms of the quadrupole susceptibility for the ground state
    Gamma_8 quartet. A huge softening of 50 % in (C_11-C_12)/2 and a spontaneous
    expansion DL/L = 1.9x10^-4 along the [001] direction in particular indicate the
    ferroquadrupole ordering of O_2^0 below T_Q1. The elastic anomalies associated
    with the antiferromagnetic ordering at T_N2 = 0.75 K and the incommensurate
    antiferromagnetic ordering are also found. Notable frequency dependence of C_44
    around 10 K is accounted for by the Debye-type dispersion indicating a Gamma_5
    rattling motion of an off-center Ce ion along the [111] direction with eight
    fractionally occupied positions around the 4a site in a cage. The thermally
    activated Gamma_5 rattling motion obeying a relaxation time t = t_0exp(E/k_BT)
    with an attempt time t_0 = 3.1x10^-11 sec and an activation energy E = 70 K
    dies out with decreasing temperature, and then the off-center tunneling state
    of Ce ion in the 4a-site cage will appear at low temperatures.

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  • Quadrupole and lattice effects of orbitally degenerate 4f-electron systems

    T Goto, M Akatsu, T Yanagisawa, T Yamaguchi, Y Nemoto, O Suzuki, S Nakamura, S Kunii, R Watanuki, K Suzuki

    JOURNAL OF PHYSICS-CONDENSED MATTER   15 ( 28 )   S2101 - S2107   2003.7

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    The quadrupole orderings and lattice effects in 4f-electron systems with orbital degeneracy in rare earth compounds have been investigated by ultrasonic and thermal expansion measurements. A ferroquadrupole (FQ) O-xy-type ordering associated with a trigonal distortion in HoB6 with a Gamma(5) ground state is presented. The trigonal distortion in ordered phase IV CexLa1-xB6 (x = 0.75 and 0.70) with a Gamma(8) ground state indicates O-xy-type FQ ordering in phase IV. In both systems, HoB6 and CexLa1-xB6, C-44 anomalies are observed. In tetragonal HoB2C2, an ordered phase IV appears near a tetra-critical point, where the antiferroquadrupole phase II and antiferromagnetic phase III compete with each other. Noticeable ultrasonic attenuation and softening of elastic constants in phase IV of HoB2C2 due to quadrupole fluctuation with a slow relaxation time tau similar to 7 x 10(-9) s are found.

    DOI: 10.1088/0953-8984/15/28/331

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  • Elastic constants of antiferro-quadrupole ordering system DyB2C2

    Y Nemoto, T Yanagisawa, K Hyodo, T Goto, S Miyata, R Watanuki, K Suzuki

    PHYSICA B-CONDENSED MATTER   329   641 - 642   2003.5

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    Elastic constants of tetragonal system DyB2C2 with antiferro-quadrupole (AFQ) ordering have been measured by using ultrasonic method. Remarkable elastic softenings of the C-44 and (C-11 - C-12)/2 have been observed towards the AFQ transition at T-Q = 25 K. The present results show that a CEF ground state is a pseudo-quartet consisting of two Kramers doublets of E-1/2 and E-3/2 in C-4h site symmetry of Dy3+ ion. The dominant softening Of C-44 probably leads to the order parameter of O-yz and O-zx in AFQ phase. Magnetic phase diagram applied fields along the [100] direction determined by field dependence of the C-44 is presented. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02552-8

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  • Thermal expansion and ultrasonic measurements of ferroquadrupole ordering in HoB6

    T Yamaguchi, M Akatsu, Y Nakano, T Washizawa, Y Nemoto, T Goto, A Donni, S Nakamura, S Kunii

    PHYSICA B-CONDENSED MATTER   329   622 - 623   2003.5

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    Rare-earth hexaboride HoB6 shows a ferroquadrupole ordering of O-yz, O-zx and O-xy with Gamma(5) symmetry at T-Q = 6.1 K accompanied by a structural change from cubic to trigonal. In order to examine the order parameter in HoB6, we have performed ultrasonic and thermal expansion measurements. The lattice length along [001] expands DeltaL/L-[001] = 2.5 x 10(-4) just below T-Q, while the length along [111] shrinks appreciably DeltaL/L-[111] = -4.5 x 10(-3). This result confirms the cubic-trigonal distortion observed by neutron scattering experiments. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02524-3

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  • Elastic properties of the Kondo compounds CexLa1-xB6 (x=0.75 and 0.70)

    M Akatsu, Y Nemoto, T Goto, O Suzuki, S Nakamura, S Kunii

    PHYSICA B-CONDENSED MATTER   329   626 - 627   2003.5

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    We have made thermal expansion measurements to examine the characters of an ordered phase IV in the dense Kondo compounds CexLa1-xB6 (x = 0.75, 0.70). For both compounds, expansion along the [0 0 1] direction and shrinkage along [1 1 1] with decreasing temperature have been observed in phase IV. These results indicate the lattice distortion from cubic to trigonal structure. A ferro-quadrupole ordering of O-yz, O-zx, O-xy, with Gamma(5) symmetry is a probable candidate for the order parameter of the phase IV. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02529-2

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  • 超音波による正方晶DyB_2C_2・HoB_2C_2の四重極子秩序の研究(2002年度基研研究会「軌道自由度を持つ強相関電子系の理論の進展」,研究会報告)

    柳澤 達也, 根本 祐一, 後藤 輝孝, 綿貫 竜太, 鈴木 和也

    物性研究   79 ( 6 )   1024 - 1025   2003.3

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    この論文は国立情報学研究所の電子図書館事業により電子化されました。

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  • Ultrasonic investigation of quadrupole ordering in HoB<inf>2</inf>C<inf>2</inf>

    Tatsuya Yanagisawa, Terutaka Goto, Yuichi Nemoto, Shingo Miyata, Ryuta Watanuki, Kazuya Suzuki

    Physical Review B - Condensed Matter and Materials Physics   67   1151291 - 1151298   2003.3

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    The elastic properties of HoB2C2 undergoing an antiferroquadrupole ordering with a tetragonal structure have been investigated by means of ultrasonic measurements. The transverse (C11-C12)/2, C44, and C66modes exhibit characteristic softenings with decreasing temperature in a paramagnetic phase I down to an ordered phase IV at TC?= 5.9 K. The softening of of (C11-C12)/2, C44and C66is described by a formula CΓ = CΓ0(T-TC0)(T-Θ) due to the quadrupole-strain interaction for the 4f state of HoB2C2consisting of a ground E doublet with orbital degeneracy and an excited singlet with a small-energy splitting Δ. The significant softening of the elastic constant and the ultrasonic attenuation in phase IV between TC1= 5.9 K and TC2= 5.0 K have been found. The ultrasonic dispersion in phase IV indicates the slowing down of the quadrupole fluctuation time, τ = 7 × 10-9sec.

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  • Trigonal lattice distortion and ferro-quadrupole ordering in phase IV of CexLa1-xB6 (x=0.75 and 0.70)

    M Akatsu, T Goto, Y Nemoto, O Suzuki, S Nakamura, S Kunii

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   72 ( 2 )   205 - 208   2003.2

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    The low-temperature lattice effects of the Kondo compounds CexLa1-xB6 (x = 0.75 and 0.70) with a Gamma(8) ground state have been investigated by dilatometric measurements. In an ordered phase IV below T-C = 1.6 K (1.4 K) for x = 0.75 (0.70), the lattice length along the [001] direction reveals an increase, while the length along the [111] direction shows an appreciable decrease. This lattice distortion is described in terms of the trigonal strain (epsilon(yz)) = (epsilon(zx)) = (epsilon(xy)) not equal 0 with Gamma(5) symmetry in addition to a volume expansion epsilon(B) = epsilon(xx) + epsilon(yy) + epsilon(zz) with full symmetry Gamma(1). The trigonal strain in phase IV indicates a ferro-quadrupole ordering of (O-yz) = (O-xy) not equal 0.

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  • Ultrasonic investigation of quadrupole ordering in (formula presented)

    Tatsuya Yanagisawa, Terutaka Goto, Yuichi Nemoto, Shingo Miyata, Ryuta Watanuki, Kazuya Suzuki

    Physical Review B - Condensed Matter and Materials Physics   67 ( 11 )   8   2003

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    The elastic properties of (formula presented) undergoing an antiferroquadrupole ordering with a tetragonal structure have been investigated by means of ultrasonic measurements. The transverse (formula presented) (formula presented) and (formula presented) modes exhibit characteristic softenings with decreasing temperature in a paramagnetic phase I down to an ordered phase IV at (formula presented) The softening of (formula presented) (formula presented) and (formula presented) is described by a formula (formula presented) due to the quadrupole-strain interaction for the (formula presented) state of (formula presented) consisting of a ground E doublet with orbital degeneracy and an excited singlet with a small-energy splitting (formula presented) The significant softening of the elastic constant and the ultrasonic attenuation in phase IV between (formula presented) and (formula presented) have been found. The ultrasonic dispersion in phase IV indicates the slowing down of the quadrupole fluctuation time, (formula presented). © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevB.67.115129

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  • Quadrupolar sysceptibility and superconductivity of PrOs_4Sb_<12>

    Goto T, Sato H, Nemoto Y, Sakai K, Yamaguchi T, Akatsu M, Yanagisawa T, Hazama H, Onuki K, Sugawara H

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   499 - 499   2003

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  • Elastic constants of YbAs at low temperature

    Morita K, Udagawa T, Tamaki A, Oyamada A, Suzuki T, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   468 - 468   2003

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  • Elastic constant of Ho_<1-x>Y_xB_2C_2

    Kishi E, Tobo A, Yanagisawa T, Nemoto Y, Goto T, Yamauchi H, Ohoyama K, Onodera H

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   489 - 489   2003

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  • 20pPSA-27 超音波による HoB_2C_2 の AFQ 磁気相図

    柳澤 達也, 森脇 達也, 後藤 輝孝, 根本 祐一, 綿貫 竜太, 鈴木 和也, 鈴木 修, 木戸 義勇

    日本物理学会講演概要集   58 ( 0 )   463 - 463   2003

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  • Ultrasonic Measurements of Ce_xLa_<1-x>B_6 in High Magnetic Fields

    Akatsu M, Nemoto Y, Goto T, Suzuki O, Nakamura S, Kunii S, Kido G

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   556 - 556   2003

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  • Study of phase IV of HoB_2C_2 by thermal expansion with capacitance method

    Yanagisawa T, Kimura K, Goto T, Nemoto Y, Watanuki R, Suzuki K

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   553 - 553   2003

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  • Anomalous magnetic phase (phase IV) in Ho_<1-x>Y_xB_2C_2

    Kishi E, Onodera H, Yamaguchi Y, Tobo A, Onimaru T, Sakakibara T, Yanagisawa T, Nemoto Y, Goto T, Yamauchi H, Ohoyama K

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   554 - 554   2003

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  • Study of Charge Ordering in Nd_<1-x>Sr_xMnO_3 by Thermal Expansion Measurements

    Hayashi K, Okano S, Hazama H, Nemoto Y, Goto T, Kuwahara H, Tokura Y

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   528 - 528   2003

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  • Rattling Motion, Quadrupolar Effect and Superconductivity in PrOs_4Sb_<12>

    Nemoto Y, Sakai K, Onuki K, Yamaguchi T, Goto T, Sugawara H, Sato H

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   549 - 549   2003

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  • Ultrasonic measurements of rattling mode and two-level system in clathrate compound La_3Pd_<20>Ge_6

    Yamaguchi T, Nemoto Y, Akatsu M, Yanagisawa T, Goto T, Suzuki O, Kitazawa H

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   490 - 490   2003

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  • Ultrasonic study of antiferro-quadrupole ordering in HoB2C 2

    Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto, Shingo Miyata, Ryuta Watanuki, Kazuya Suzuki

    Physica B: Condensed Matter   329-333 ( II )   624 - 625   2003

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    Elastic properties of the ternary rare earth compound HoB2C 2 with a tetragonal symmetry have been investigated by means of ultrasonic measurements. The elastic constants of C44, C 66 and (C11-C12)/2 exhibit the characteristic softening below about 40 K. In order to analyze quadrupole susceptibility, we assume a pseudo-degeneracy model consisting of a ground state E-doublet and an excited state A- or B-singlet at energy Δ ∼ 5.0 K. considerable softening of the elastic constant and ultrasonic attenuation in phase IV between TC1 = 5.9 K and TC2 = 5.0 K have been found. The slow relaxation rate of 7 × 10-9 s suggests that the fluctuation of quadrupole moments is enhanced in phase IV. We also show a H-T phase diagram of HoB2C2 under magnetic fields along [100]. © 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02528-0

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  • Magnetic field dependence of the elastic constant due to antiferroquadrupoler ordering in TbB_2C_2

    Ozeki F, Yanagisawa T, Nemoto Y, Goto T, Kaneko K, Onodera H, Yamaguchi Y

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   462 - 462   2003

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  • Antiferro quadrupolar ordering of DyB_2C_2 studied by thermal expansion measurements

    Moriwaki T, Yanagisawa T, Nemoto Y, Goto T, Watanuki R, Suzuki K

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   462 - 462   2003

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  • Quadrupolar Effect and Rattling motion in Heavy hermion Superconductor PrOs_4Sb_<12>

    Sakai K, Onuki K, Yamaguchi T, Nemoto Y, Goto T, Sugawara H, Sato H

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   456 - 456   2003

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  • Quadrupole Susceptibility and Crystalline Electric Field in PrRu_4Sb_<12>

    Onuki K, Sakai K, Nemoto Y, Goto T, Takeda N, Ishikawa M

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   457 - 457   2003

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  • PrOs_4Sb_<12>の四重極子感受率と超伝導(スクッテルダイト化合物研究の現状と展望,研究報告)

    根本 祐一, 間 広文, 坂井 一浩, 後藤 輝孝, 菅原 仁, 佐藤 英行

    物性研究   79 ( 6 )   936 - 936   2003

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    Other Link: http://hdl.handle.net/2433/97495

  • Anisotropy in the magnetic phase diagrams of Ce<inf>x</inf>Lai<inf>1-x</inf>B<inf>6</inf>

    Shintaro Nakamura, Osamu Suzuki, Terutaka Goto, Yuichi Nemoto, Mitsuhiro Akatsu, Satoru Kunii

    Journal of the Physical Society of Japan   71   112 - 114   2002.12

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    Anisotropy in the magnetic phase diagrams (H-T plane) of CexLai1-xB6and the Ce concentration dependence of the magnetic phase diagrams are presented. Phase boundaries of phase IV in the diagrams are isotropic. Present results suggest the absence of quadrupolar degeneracy in phase IV. Field induced antiferromagnetism is shown in CexLa1-xB6. © 2002 The Physical Society of Japan.

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  • Thermal expansion measurements on Ce<inf>0.75</inf>La<inf>o.25</inf>B<inf>6</inf>

    Mitsuhiro Akatsu, Osamu Suzuki, Yuichi Nemoto, Terutaka Goto, Shintaro Nakamura, Satoru Kunii

    Journal of the Physical Society of Japan   71   115 - 117   2002.12

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    We have made low-temperature thermal expansion and magnetostriction measurements on the Kondo compound Ce0.75La0.25B,6. With decreasing temperature, Ce0.75La0.25B,6in phase IV expands along the [001] axis and shrinks along the [111] axis. A tiny anisotropic distortion is found in this phase. Probably, some kinds of macroscopic symmetry are breaking in phase IV. © 2002 The Physical Society of Japan.

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  • Coulombic insight into charge ordering in Yb<inf>4</inf>As<inf>3</inf>and Sm<inf>3</inf>Te<inf>4</inf>

    Hiroshi Iyetomi, Hideto Hlgashi, Yuichi Nemoto, Terutaka Goto

    Journal of the Physical Society of Japan   71   306 - 308   2002.12

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    Charge ordering in YD4AS3and Sm3Te4, complementary f-electron compounds with the same crystalline structure, is investigated on the basis of a Coulomb lattice gas model; the Coulomb interactions between ions are fully taken into account within a classical treatment. The Madelung energy of the system at finite temperatures is calculated with a Monte Carlo (MC) method simulating the Boltzmann distribution of multivalent cations on equivalent lattice sites. The unit cell for the MC simulations is extended to contain 32 molecular formulas in it. The model is successful in distinguishing the two mixed-valence compounds with different characteristics of charge ordering. Yb4As3shows a phase transition (Verwey transition) due to charge ordering while Sm3Te4continuously freezes into a glassy state on cooling. © 2002 The Physical Society of Japan.

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  • Quadrupole susceptibility of HoB<inf>2</inf>C<inf>2</inf>

    Terutaka Goto, Tatsuya Yanagisawa, Yuichi Nemoto, Shingo Miyata, Ryuta Watanuki, Kazuya Suzuki

    Journal of the Physical Society of Japan   71   88 - 90   2002.12

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    We have investigated the elastic constants of the ternary rare earth compound H0B2C2with a tetragonal structure by means of the ultrasonic method. The elastic constants of (C11-C12)/2, C44and C66, corresponding to the transverse ultrasonic modes exhibit the softening proportional to reciprocal temperature below about 40 K. This softening is commonly enhanced in the ordered phase IV below Tc1=5.9 k. An abrupt increase of elastic constants is found in the ordered phase III below Tc2=5.0 k characterized by the simultaneous antiferro-type ordering of electric quadrupole and magnetic dipole moments. The quadrupole susceptibility based on a model consisting of a ground state E-doublet and an excited singlet with a low energy in H0B2C2is employed for the analysis of the softening above Tc1=5.9 K. The enhancement of the elastic softening in the phase IV of H0B2C2resembles to the soft C44mode in the phase IV in Ceo.75Lao.25B6. © 2002 The Physical Society of Japan.

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  • Ultrasonic investigations of ferroquadrupolar ordering at 8c site in Ce<inf>3</inf>Pd<inf>20</inf>Ge<inf>6</inf>

    Yuichi Nemoto, Takashi Yamaguchi, Terutaka Goto, Osamu Suzuki, Takenobu Horino, Andreas Dönni, Takemi Komatsubara

    Journal of the Physical Society of Japan   71   121 - 123   2002.12

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    We have performed low-temperature ultrasonic investigations using a top-loading type dilution refrigerator to examine the detailed H-T phase diagrams below 1 K in Ce3Pd20Ge6The field dependence of the elastic constant C44under fields along [001] and (C11- C12)/2 under fields along [110] shows the anomaly which is the phase transition point from antiferromagnetic (AFM) phase III coexisting ferroquadrupolar (FQ) ordering to pure FQ phase II. Several anomalies corresponding to subphases near 0.5 T, 1.2 T and 1.6 T have been observed in both cases. These anomalies are closely related to the weak incommensurate magnetic Bragg peaks below 0.5 K with a propagation vector k = [0,0,1 - τ], (τ ∼ 0.06), observed by the neutron diffraction for Ce3Pd20Ge6In the series of R3Pd20X6compounds, two successive AFM phase transition at Tnicharacterized by a propagation vector k1=[111] at 8c sites and Tn2characterized by k2=[001] at 4a sites were commonly observed. In Ce3Pd20Ge6a structural phase transition associated with the O-2-0(or O2-2) type FQ ordering at 8c sites will prevent the AFM ordering at 8c sites preferable along k1=[111]. © 2002 The Physical Society of Japan.

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  • Ultrasonic investigation of metamagnetic transition in CeRu<inf>2</inf>Si<inf>2</inf>

    Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto, Yoshichika Onuki

    Journal of the Physical Society of Japan   71   267 - 269   2002.12

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    We have performed low-temperature ultrasonic measurements on CeRu2Si2by using a dilution refrigerator down to 20 mK with a superconducting magnet up to 16 T. The longitudinal modes exhibit huge softening of 20% around a metamagnetic transition point Hc∼7.7 T, while the transverse modes show softening of about 1%. This result suggests that the coupling of the volume strain b to the order parameter with total symmetry plays a crucial role for the metamagnetic transition in CeRu2Si2. In the vicinity of Hc, the enormous ultrasonic attenuation has been observed in the longitudinal ultrasonic modes. The relaxation time r increases considerably near the metamagnetic transition due to a critical slowing-down. We also show the detailed magnetic phase diagram of CeRu2Si2down to 20 mK around Hc© 2002 The Physical Society of Japan.

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  • Magnetic field dependence of elastic constants in Pr<inf>1-x</inf>Ca<inf>x</inf>MnO<inf>3</inf>

    Hirofumi Hazama, Yuichi Nemoto, Terutaka Goto, Yasuhide Tomioka, Atsushi Asamitsu, Yoshinori Tokura, Yoshinori Tokura

    Journal of the Physical Society of Japan   71   139 - 141   2002.12

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    We have investigated charge and orbital (quadrupolar) ordering in perovskite manganites Pr1-xCaxMnO3, (x = 0.35, 0.40, 0.50) by ultrasonic measurements. Only transverse (C11=C12)/2 mode of the x = 0.35,0.40 and 0.50 compounds shows a softening from 400 K down to the charge ordering point Tco= 220 - 240 K. This softening is originated from the bilinear coupling of the quadrupole moment of the egorbital in Mn3+ion to the elastic strain. Furthermore, the elastic softening in both (C11- C12)/2 and C44modes due to the coupling of the charge fluctuation mode to elastic strain is observed just above Tco, especially for the x = 0.50 compound. The considerable magnetic field dependence of the elastic constants is obseved. In particular, the magnetic fields up to 12 T releases completely the elastic softening of (C11- C12)/2 mode due to the fact that the charge fluctuation is suppressed under 12 T in the x = 0.40 compound. © 2002 The Physical Society of Japan.

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  • Unconventional emergence of elastic softening induced by magnetic fields in the unusual heavy-fermion compound PrFe4R12

    Y Nakanishi, M Yoshizawa, T Yamaguchi, H Hazama, Y Nemoto, T Goto, TD Matsuda, H Sugawara, H Sato

    JOURNAL OF PHYSICS-CONDENSED MATTER   14 ( 45 )   L715 - L720   2002.11

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    Ultrasonic measurement on the filled skutterudite compound PrFe4P12 exhibits a mysterious temperature dependence of the elastic constant (C-11-C-12)/2. Pronounced elastic softening at low temperatures is revived by applying a magnetic field. This fact strongly suggests the 4f-multiplet ground state of the Pr ion split by the crystalline electric field (CEF) to be a Gamma(3) non-Kramers doublet. The expectation value of a quadrupole moment with Gamma(3) symmetry in the CEF ground state, which leads to elastic softening at low temperature, was evaluated by theoretical fitting to the present results. This may imply that suppression of the electric quadrupole Kondo effect occurs in PrFe4P12 and the quadrupole moment becomes steady due to the application of a magnetic field.

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  • Ultrasonic investigation of the heavy fermion compound CeRu2Si2

    T Yanagisawa, Y Nemoto, T Goto, Y Onuki

    PHYSICA B-CONDENSED MATTER   312   271 - 273   2002.3

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    We have performed ultrasonic measurements on CeRu2Si2 down to 20 mK in magnetic fields up to 16 T. The longitudinal C-11 and C-33 exhibit considerable softening of 20% which coincide with ultrasonic absorption around the metamagnetic point H-C = 7.7 T. The transverse C-44 and C-66 show only a small softening of approximate to 0.8 % around H-C. The softening in the longitudinal C-11 and C-33 comprising a volume strain suggests that the coupling of the order parameter with total symmetry to the volume strain plays a crucial role for the metamagnetic transition in CeRu2Si2. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(01)01549-6

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  • Ultrasonic study of orbital and charge fluctuation in Pr1-xCaxMnO3

    H Hazama, Y Nemoto, T Goto, Y Tomioka, A Asamitsu, Y Tokura

    PHYSICA B-CONDENSED MATTER   312   757 - 759   2002.3

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    We have performed ultrasonic measurements on perovskite manganites Pr1-xCaxMnO3 (x = 0.35, 0.40, 0.50) with orbital and charge degrees of freedom. Above the charge ordering point T-co = 220-240K, the transverse elastic (C-11 - C-12)/2 mode associated with epsilon(nu) = epsilon(xx) - epsilon(yy) strain for the compounds x = 0.35, 0.40 and 0.50 shows a remarkable softening in all the samples. This softening originates from the coupling of the quadrupolar moment of the e; orbital, d(3z(2) - r(2)) and d(x(2) - y(2)), of Mn3+ ion to the elastic strain. The elastic softening in both (C-11 - C-12)/2 and C-44 modes due to charge fluctuations of the Mn3+ and Mn4+ ions is also observed just above T-co. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(01)01537-X

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  • Ferroquadrupole ordering of the ternary intermetallic compound Ce3Pd20Ge6

    T Goto, T Horino, Y Nemoto, T Yamaguchi, A Donni, O Suzuki, T Komatsubara

    PHYSICA B-CONDENSED MATTER   312   492 - 494   2002.3

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    We have investigated the elastic properties of the ternary inter-metallic compound Ce3Pd20Ge6 with a Gamma(8) ground state by ultrasonic and dilatometric methods. A softening of 50% in the transverse (C-11 - C-12)/2 mode above T-Q = 1.25 K and a spontaneous lattice distortion DeltaL/L = 2.5 x 10(-4) along the [001] direction below T-Q indicate a structural transition from cubic to tetragonal (or orthorhombic) symmetry accompanied by O-2(0)- or O-2(2)-type ferroquadrupole ordering. The magnetic field dependence of (C-11 - C-12)/2 and the dilatation DeltaL/L along [001] are also presented. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(01)01530-7

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  • Low-temperature behavior of the elastic constant C-44 in CexLa1-xB6

    Y Nemoto, M Akatsu, T Goto, O Suzuki, S Nakamura, S Kunii

    PHYSICA B-CONDENSED MATTER   312   191 - 193   2002.3

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    We have made the ultrasonic experiments to examine the low-temperature elastic properties in the Kondo compound CexLa1-xB6 for x = 0.70, 0.65 and 0.60. The transverse C-44 mode in x = 0.70 and 0.65 shows steep decrease as much as 25% around the transition point into the ordered phase IV. The remarkable softening of C-44 down to 25mK reveals that the phase IV remains to be stable even at absolute zero in x = 0.70 and 0.65. The C-44 of x = 0.60 shows gentle decrease about 9% below 1 K with a minimum around 0.4 K suggesting the absence of phase IV. A considerable discrepancy between the low-temperature limit of C-44 in x = 0.60, 0.50 and that in x = 0.70, 0.65 indicates that the ground state of x = 0.60 and 0.50 is the nonmagnetic state attributed to the Kondo screening effect. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(01)01193-0

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  • Energy level crossing and high-field magnetization in HoVO4

    O Suzuki, H Kitazawa, H Abe, N Tsujii, G Kido, T Washizawa, Y Nemoto, T Goto

    PHYSICA B-CONDENSED MATTER   312   780 - 782   2002.3

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    The high-field magnetization, in fields up to 28 T, and magnetic susceptibility were measured in HoVO4, which has a crystal-field singlet ground state. The temperature dependence of magnetic susceptibility exhibits Van Vleck behavior due to the non-magnetic ground state. An abrupt increase more than 8mu(B) due to the level crossing of the non-magnetic ground state with the excited one. having the mainly J(z) = -7, is observed in the magnetization process at the field of 11.5 T along the [0 0 1]-axis. The magnetization processes along the three principal axes and the temperature dependence of magnetic susceptibility are well reproduced by the crystal-field energy level scheme previously reported. (C) 2002 Elsevier Science B.V. All rights reserved.

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  • Measurement of thermal expansion in HoB2C2 and DyB2C2

    Kimura K, Yanagisawa T, Nemoto Y, Goto T, Miyata S, Watanuki R, Suzuki K

    Meeting Abstracts of the Physical Society of Japan   57 ( 0 )   442 - 442   2002

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  • Thermal Expansion Measurements of Ferroquadrupole Ordering in Rare-Earth Compound HoB6

    Yamaguchi T, Akatsu M, Nemoto Y, Donni A, Goto T, Nakamura S, Kunii S

    Meeting Abstracts of the Physical Society of Japan   57 ( 0 )   513 - 513   2002

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  • Ultrasonic measurement on (Dy,Ho)B2C2

    Yanagisawa T, Goto T, Nemoto Y, M Shingo, Watanuki R, Suzuki K, Kaneko K, Onodera H, Yamaguchi Y

    Meeting Abstracts of the Physical Society of Japan   57 ( 0 )   522 - 522   2002

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  • 24aPS-83 Elastic properties of CeRn_4Sb_<12>

    Nakanishi Y, Yamaguchi T, Hazama H, Nemoto Y, Goto T, Matsuda T. D, Sugawara H, Sato H, Yoshizawa M

    Meeting Abstracts of the Physical Society of Japan   57 ( 0 )   492 - 492   2002

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  • 24pPSB-3 Ultrasonic study of orbital and charge orderings in Ndi_<1-x>Sr_xMnO_3

    Hazama H, Nemoto Y, Goto T, Kuwahara H, Tomioka Y, Asamitsu A, Tokura Y

    Meeting Abstracts of the Physical Society of Japan   57 ( 0 )   521 - 521   2002

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  • 24aPS-29 Elastic anomalies due to quadrupole ordering in HoB2C2

    Nemoto Y, Yanagisawa T, Goto T, Miyata S, Watanuki R, Suzuki K

    Meeting Abstracts of the Physical Society of Japan   57 ( 0 )   480 - 480   2002

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  • 24aPS-30 Elastic anomalies of DyB2C2 around quadrupolar transition

    Hyodo K, Yamaguchi Y, Nemoto Y, Yanagisawa T, Goto T, Miyata S, Watanuki R, Suzuki K, Kaneko K, Onodera H

    Meeting Abstracts of the Physical Society of Japan   57 ( 0 )   480 - 480   2002

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  • Study of Lattice Anomaly in CexLa1-xB6(x=0.75,0.70) by Thermal Expansion Measurements

    Akatsu M, Nemoto Y, Goto T, Suzuki O, Nakamura S, Kunji S

    Meeting Abstracts of the Physical Society of Japan   57 ( 0 )   512 - 512   2002

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  • Ultrasonic Study of Elastic Anomalies in Single Crystal PrPtBi

    Sakai K, Yamaguchi T, Hazama H, Nemoto Y, Goto T, Yoshimura K, Kasaya M

    Meeting Abstracts of the Physical Society of Japan   57 ( 0 )   444 - 444   2002

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  • Study of Charge and Orbital Orderings in Pr1-xCaxMnO3 by Thermal Expansion Measurements

    Okano S, Hazama H, Nemoto Y, Goto T, Tomioka Y, Asamitsu A, Tokura Y

    Meeting Abstracts of the Physical Society of Japan   57 ( 0 )   450 - 450   2002

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  • 4f instability and elastic properties in the metal system TmS in high magnetic fields

    Yoshiki Nakanishi, Yoshiki Nakanishi, Sakon Takuo, Mitsuhiro Motokawa, Takeshi Matsumura, Yuichi Nemoto, Hirofumi Hazama, Terutaka Goto, Takashi Suzuki

    Physical Review B - Condensed Matter and Materials Physics   64   1844341 - 1844347   2001.11

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    We have made an investigation of the elastic properties of TmS in high magnetic fields. A pronounced softening was observed in elastic constants C11and (C11-C12)/2 at low temperatures, while no softening was observed in C44. An analysis based on crystalline electric field splitting of Tm ions indicates that ferroelectric quadrupolar interactions among quadrupolar moments with Γ3symmetry developed at low temperatures. Two distinct anomalies in C11were found in magnetic fields. We propose an (H-T) phase diagram based on present and former results. This phase diagram implies that a field-induced ferromagnetic quadrupolar transition may occur in addition to an antiferromagnetic transition. Furthermore, the bulk modulus CBexhibits a softening at low temperature, implying an instability of the 4f state in the Tm ions.

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  • Magnetic properties of TmS in high magnetic fields

    Y Nakanishi, F Takahashi, T Sakon, T Matsumura, Y Nemoto, H Hazama, T Goto, T Suzuki, M Motokawa

    PHYSICA B   294   153 - 155   2001.1

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    Magnetic properties of a single crystal of TmS have been investigated by means of ultrasonic measurements in magnetic fields. We have found remarkable transitions in the elastic constants at boundaries in a magnetic-phase diagram. (C) 2001 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(00)00630-X

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  • Ultrasonic measurements on TmS

    Y. Nakanishi, T. Sakon, T. Matsumura, Y. Nemoto, H. Hazama, T. Goto, T. Suzuki, M. Motokawa

    Journal of Magnetism and Magnetic Materials   226-230 ( I )   164 - 166   2001

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    The elastic properties on TmS have been investigated for the first time by means of ultrasonic mesurement. The remarkable softening of the longitudinal (C11 - C12)/2 mode was observed, while the transverse C44 mode increases monotonously with decreasing temperature. The bulk modulus CB also shows the anomaly. These behaviors are discussed from the views of the quadrupolar interactions and the unstable 4f state of Tm ion. ©2001 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0304-8853(00)00780-0

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  • Energy level crossing and high-field magnetization in HoVO_4

    Suzuki O, Kitazawa H, Kido G, Washizawa T, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   457 - 457   2001

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  • Elastic anomaly around the transition at 6.4 K in PrFe_4P_<12>

    Nakanishi Y, Yamaguchi T, Hazama H, Nemoto Y, Goto T, Matsuda D, Sugawara H, Sato H, Yoshizawa M

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   576 - 576   2001

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  • Field induced crystal-field level crossing in HoVO_4

    Washizawa T, Goto T, Nemoto Y, Kitazawa H, Suzuki O, Harumi H

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   499 - 499   2001

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  • The elastic anomalies due to the charge fluctuation in perovskite manganite Pr_<1-x>Ca_xMnO_3

    Hazama H, Nemoto Y, Goto T, Tomioka Y, Asamitsu A, Tokura Y

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   514 - 514   2001

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  • Ultrasonic measurement of CeRu_2Si_2

    Yanagisawa T, Nemoto Y, Goto T, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   493 - 493   2001

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  • Elastic anomalies of Ce_xLa_<1-x>B_6 at low temperatures part II

    Akatsu M, Nemoto Y, Goto T, Nakamura S, Kunii S, Suzuki O

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   494 - 494   2001

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  • Elastic anomalies around the metamagnetic transition of CeRu_2Si_2

    Yanagisawa T, Nemoto Y, Goto T, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   472 - 472   2001

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  • Unconventional elastic softening behavior of PrFe_4P_<12> in magnetic fields

    Nakanishi Y, Yamaguchi T, Hazama H, Nemoto Y, Goto T, Matsuda T. D, Sugawara H, Sato H, Yoshizawa M

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   497 - 497   2001

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  • Anisotropy in the magnetic Phase diagrams of Ce_xLa_<1-x>B_6, and low-T properties

    Nakamura S, Suzuki O, Akatsu M, Goto T, Nemoto Y, Kunii S

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   400 - 400   2001

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  • Quadrupolar effect in rare-earth compounds HOB_6 by thermal expansion measurement

    Yamaguchi T, Akatsu M, Nemoto Y, Goto T, Donni A, Nakamura S, Kunii S

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   472 - 472   2001

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  • The study of metastable and stable phase in TbPdAl

    Mitsunobu H, Nemoto Y, Donni A, Tsuchiya Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   313 - 313   2001

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  • Monte Carlo Simulation Study on the Verwey Transion in Rare-Earth Compounds

    Iyetomi H, Higashi H, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   382 - 382   2001

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  • (formula presented) instability and elastic properties in the metal system TmS in high magnetic fields

    Yoshiki Nakanishi, Sakon Takuo, Mitsuhiro Motokawa, Takeshi Matsumura, Yuichi Nemoto, Hirofumi Hazama, Terutaka Goto, Takashi Suzuki

    Physical Review B - Condensed Matter and Materials Physics   64 ( 18 )   2001

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    We have made an investigation of the elastic properties of TmS in high magnetic fields. A pronounced softening was observed in elastic constants (formula presented) and (formula presented) at low temperatures, while no softening was observed in (formula presented) An analysis based on crystalline electric field splitting of Tm ions indicates that ferroelectric quadrupolar interactions among quadrupolar moments with (formula presented) symmetry developed at low temperatures. Two distinct anomalies in (formula presented) were found in magnetic fields. We propose an (formula presented) phase diagram based on present and former results. This phase diagram implies that a field-induced ferromagnetic quadrupolar transition may occur in addition to an antiferromagnetic transition. Furthermore, the bulk modulus (formula presented) exhibits a softening at low temperature, implying an instability of the (formula presented) state in the Tm ions. © 2001 The American Physical Society.

    DOI: 10.1103/PhysRevB.64.184434

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  • Quadrupolar effect in the perovskite manganite La1-xSrxMnO3

    Hirofumi Hazama, Terutaka Goto, Yuichi Nemoto, Yasuhide Tomioka, Atsushi Asamitsu, Yoshinori Tokura

    Physical Review B - Condensed Matter and Materials Physics   62 ( 22 )   15012 - 15020   2000.12

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    Elastic properties of the perovskite manganite La1-xSrxMnO3 (x = 0.12, 0.165, 0.3) with both orbital and charge degrees of freedom have been investigated by means of ultrasonic measurements. Above the structural phase transition point Ts = 290 K for x = 0.12 and Ts = 310 K for x = 0.165, the transverse (C11-C12)/2 mode with the elastic strain of Eg symmetry exhibits a pronounced softening, while the C44 mode with strain of T2g symmetry shows a monotonous increase in lowering temperature. The softening of (C11-C12)/2 is described in terms of the quadrupolar susceptibility for the coupling between the quadrupolar moment, O2 0=(2lz 2-lx 2-ly 2)/√3 and O2 2=lx 2-ly 2, of the dγ doublet of the Mn3+ ion and the appropriate elastic strain with Egsymmetry. Elastic softenings of (C11-C12)/2 and C44 modes above Tco= 145 K of x = 0.12 are responsible for the symmetry breaking character of the charge ordering, while a round minimum of the bulk modulus CB around Tco = 100 K of x = 0.165 indicates a glass state in charge ordering. The disappearance of the ultrasonic echo signal below Tco= 145 K for x=0.12 is ascribed to a considerable sound wave scattering by elastic domains in the triclinic structure.

    DOI: 10.1103/PhysRevB.62.15012

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  • Quadrupolar effect of HoB6 and DyB6

    T Goto, Y Nemoto, Y Nakano, S Nakamura, T Kajitani, S Kunii

    PHYSICA B   281   586 - 587   2000.6

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    In order to examine the quadrupolar effect in heavy rare-earth compounds HoB6 and DyB6, we have measured the elastic constants in magnetic fields by the ultrasonic method. The transverse C-44 mode of both compounds exhibits huge softening following as C-44 = C-44(0)(T - T-c(0))/(T - -) above the ferro-quadrupolar transition temperature T-Q = 30.2 K for DyB6 and T-Q = 6.1 K for HoB6. The X-ray measurement of the lattice constant of DyB6 and the magtnetic field dependence of C-44 in both compounds are also discussed. (C) 2000 Elsevier Science B.V, All rights reserved.

    DOI: 10.1016/S0921-4526(99)01129-1

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  • Ultrasonic study of perovskite manganites La1-xSrxMnO3

    H Hazama, Y Nemoto, T Goto, A Asamitsu, Y Tokura

    PHYSICA B   281   487 - 488   2000.6

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    In order to examine the electron-lattice interaction of perovskite manganites with orbital degrees of freedom, we have made the ultrasonic measurements on the hole-doped compounds of La1-xSrxMnO3 (x = 0.12, 0.165). The transverse elastic mode (C-11-C-12)/2 with e(g) symmetry for both x = 0.12 and 0.165 exhibits remarkable softening around the structural phase transition point T-S. This result is ascribed to the Jahn-Teller effect of the e(g) doublet, d(3z(2) - r(2)) and d(x(2) - y(2)), of Mn3+ ions. The elastic softening associated with the charge ordering of the doped Mn4+ in a sea of Mn3+ ions is also presented. (C) 2000 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(99)01127-8

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  • Charge fluctuation in Sm3Te4

    Y Nemoto, T Goto, A Ochiai, T Suzuki

    PHYSICA B   281   136 - 138   2000.6

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    Ultrasonic measurements for a valence-fluctuation compound Sm3Te4 have been performed. Considerable dispersion around 120 K due to a thermal hopping motion of 4f-electron among Sm2+ and Sm3+ has been observed in the ultrasonic attenuation The relaxation time of the charge fluctuation 2 pi tau becomes infinite at low temperatures following as tau = tau(0)exp(E/k(B) T), here 2 pi tau(0) = 2.5 x 10(-13) s and E = 0.135 eV. The In T dependence of the elastic constants similar to a two-level system of amorphous glass compounds is observed at low temperatures below 15 K. These results indicate a two-level system of the 4f-electron tunneling in the random potential of Sm2+ and Sm3+ ions due to the charge glass state. (C) 2000 Elsevier Science B.V. All rights reserved.

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  • Elstic anomalies due to the orbital and charge fluctuation in R_<1-x>A_xMnO_3(R=La, Pr, Nd, A=Ca, Sr)

    Hazama H, Nemoto Y, Goto T, Tomioka Y, Kuwahara H, Asamitsu A, Tokura Y

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   428 - 428   2000

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  • Magnetic properties of the tetragonal compounds CeB2C2 and PrB2C2

    Hideya Onodera, Koji Kaneko, Takahiro Onimaru, Kenji Ohoyama, Yasuo Yamaguchi, Hisao Kobayashi, Yuichi Nemoto, Terutaka Goto

    Journal of Magnetism and Magnetic Materials   221 ( 3 )   293 - 300   2000

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    Magnetic properties of CeB2C2 and PrB2C2 compounds have been investigated by means of magnetization, specific heat and elastic constant measurements on single-crystalline samples. CeB2C2 is an antiferromagnet of TN = 7.3 K with a moment direction in the tetragonal [0 0 1]-plane. An order-order transition appears at 6.5 K, which is observed in the specific heat and the anomaly in the susceptibility is extremely small. The magnetization measurement confirms that PrB2C2 is a Van Vleck paramagnet. The 4f ground state of PrB2C2 is a singlet with a magnetic doublet as a first excited state. The analyses based on the second-order approximation of crystalline electric field (CEF) interaction give no systematic result. The second-order CEF parameter A20 is positive in PrB2C2, although that is negative in CeB2C2 which is similar to that in NdB2C2. It is supposed that the CEF interactions of higher order play important roles in the RB2C2 system.

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  • Ultrasonic study of the charge-fluctuation compound

    Yuichi Nemoto, Terutaka Goto, Akira Ochiai

    Physical Review B - Condensed Matter and Materials Physics   61 ( 18 )   12050 - 12058   2000

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    We have measured the ultrasonic velocity and attenuation coefficient of the rare-earth chalcogenide (Formula presented) to examine the valence-fluctuation effect due to the coexistence of (Formula presented) and (Formula presented) ions in the ratio of 1:2. The ultrasonic dispersion around 120 K indicates that the charge-fluctuation time obeys the activation-type temperature dependence (Formula presented) with a characteristic time (Formula presented) and an activation energy (Formula presented) The absence of the phase transition due to the charge ordering in (Formula presented) means a freezing of (Formula presented) and (Formula presented) ions in random distribution at low temperatures. We find an elastic softening with (Formula presented) dependence below 15 K down to a spin glass transition around 1.3 K. This striking behavior is attributed to a two-level system due to the tunneling of (Formula presented) electrons among randomly distributed (Formula presented) and (Formula presented) ions. This result is similar to the ionic tunneling in amorphous glass compounds. Employing the group-theoretical analysis, we show some aspects of charge-fluctuation modes in (Formula presented) and a possible mechanism for the charge glass state of (Formula presented) and (Formula presented) ions. © 2000 The American Physical Society.

    DOI: 10.1103/PhysRevB.61.12050

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  • Quadrupolar effect of R3Pd20Ge6 (R =Ce, Pr, Nd)

    T. Horino, O. Suzuki, Y. Nemoto, T. Goto, A. Dönni, M. Nakayama, N. Kimura, N. Tateiwa, H. Aoki, T. Komatsubara

    Physica B: Condensed Matter   281-282   576 - 578   2000

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    We have investigated the quadrupolar effects on ternary intermetallic rare-earth (R) compounds R3Pd20Ge6 by an ultrasonic method. Down to 0.4 K, the transverse modes (C11-C12)/2 and C44 of Pr3Pd20Ge6 exhibit pronounced softenings of 15.8% and 13.8%, respectively. In Nd3Pd20Ge6, the longitudinal C11 and the transverse (C11-C12)/2 modes exhibit softenings. These softenings of the elastic constants are described in terms of quadrupolar susceptibility for the ground states Γ3 of Pr3Pd20Ge6 and Γ8 of Nd3Pd20Ge6 with orbital degeneracy. © 2000 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(99)01128-X

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  • Low-temperature properties and magnetic phase digrams of Ce_xLa_<1-x>B_6

    Nakamura S, Goto T, Kunii S, Suzuki O, Akatsu M, Nemoto Y

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   444 - 444   2000

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  • The separation of orbital and charge degrees of freedom by ultrasonic measurement in Pr_<1-x>Ca_xMnO_3

    Hazama H, Nemoto Y, Goto T, Tomioka Y, Asamitsu A, Tokura Y

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   496 - 496   2000

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  • Ultrasonic Study of Metamagnetic Transition in CeRu_2Si_2

    Yanagisawa T, Nemoto Y, Goto T, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   523 - 523   2000

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  • Level crossing of HoVO_4 by low-temperature ultrasonic measurement

    Washizawa T, Nemoto Y, Goto T, Suzuki O, Kitazawa H, Unoki H

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   453 - 453   2000

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  • Elastic anomalies of Ce_xLa_<1-x>B_6 at low temperatures

    Akatsu M, Nemoto Y, Goto T, Kunii S, Nakamura S, Suzuki O

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   459 - 459   2000

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  • Quadrupolar effect in Pr_3Pd_<20>Ge_6 at low temperatures

    Yamaguchi T, Nemoto Y, Donni A, Goto T, Suzuki O, Nakayama M, Kimura N, Aoki H, Komatsubara T

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   452 - 452   2000

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  • Classical Approach to Charge-Ordered States in Rare Earth Compounds (Yb_4As_3,Sm_3Te_4) II : Finite Temperature Effects

    Higashi H, Iyetomi H, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   439 - 439   2000

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  • Elastic properties of Ce_3Pd_<20>Ge_6 by low-temperature ultrasonic measurements

    Nemoto Y, Yamaguchi T, Donni A, Goto T, Suzuki O, Kimura N, Aoki H, Komatsubara T

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   452 - 452   2000

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  • Resarch for elastic property of R_3Pd_<20>Ge_6(R=Ce, Pr, Nd)

    堀野 武信, 鈴木 修, 根本 祐一, 後藤 輝孝, アンドレアス ドンニ, 中山 昌彦, 木村 憲彰, 青木 晴善, 小松原 武美

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   508 - 508   2000

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  • Ultrasonic Study of Level Crossing in HoVO_4

    Ushiro A, Nemoto Y, Goto T, Nakamura S, Tamaki A, Unoki H

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   518 - 518   2000

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  • Classical Approach to Charge-Ordered States in Rare Earth Compounds(Yb_4As_3, Sm_3Te_4)

    Higashi H, Iyetomi H, Nemoto Y, Goto T

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   467 - 467   2000

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  • Metamagnetlc transition and acoustic dHvA effect of CeRu_2Si_2 in high magnetic fields at low temperatures

    Yanagisawa T, Nemoto Y, Goto T, Onuki Y

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   505 - 505   2000

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  • Elastic constant measurment on the localized 5f electrons system U_3Pd_<20>Si_6

    Tateiwa N, Nemoto Y, Goto T, Matsumura T, hirota K, Kimura N, Aoki H, Komatsubara T

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   445 - 445   2000

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  • Magnetization of TmSe in High Magnetic Field

    Nakanishi Y, Nemoto Y, Hazama H, Matsumura T, Suzuki T, Goto T, Motakawa M

    Meeting Abstracts of the Physical Society of Japan   55 ( 0 )   466 - 466   2000

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  • HoB<sub>6</sub>とDyB<sub>6</sub>における四重極子効果の磁場依存性

    根本祐一, 中野佳幸, 後藤輝孝, 中村慎太郎, 梶谷剛, 国井暁

    日本物理学会講演概要集   54 ( 2 )   543 - 543   1999.9

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  • Ce<sub>x</sub>La<sub>1-x</sub>B<sub>6</sub>の四重極子応答と磁気相図

    鈴木修, 後藤輝孝, 中村慎太郎, 根本祐一, 国井暁

    日本物理学会講演概要集   54 ( 1 )   370   1999.3

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  • La<sub>1-x</sub>Sr<sub>x</sub>MnO<sub>3</sub>の弾性定数

    間広文, 根本祐一, 後藤輝孝, 朝光敦, 十倉好紀

    日本物理学会講演概要集   54 ( 1 )   392   1999.3

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  • R<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>(R=La,Ce,Pr,Nd)における四重極子効果と弾性異常

    堀野武信, 鈴木修, 根本祐一, 後藤輝孝, DOENNI A, 中山昌彦, 木村憲彰, 立岩尚之, 小松原武美

    日本物理学会講演概要集   54 ( 1 )   445   1999.3

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  • Quadrupolar ordering of Ce3Pd20Ge6

    O Suzuki, T Horino, Y Nemoto, T Goto, A Donni, T Komatsubara, M Ishikawa

    PHYSICA B-CONDENSED MATTER   259-61   334 - 335   1999.1

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    We present ultrasonic measurement of the ternary intermetallic compound Ce3Pd20Ge6, where quadrupolar ordering at T-Q approximate to 1.2 K occurs at a higher temperature than the antiferromagnetic ordering at T-N = 0.75 K. The Curie term in the quadrupolar susceptibility for the crystal-held ground-state Gamma(8) gives rise to a softening of the transverse modes (C-11 - C-12)/2 and C-44 above T-Q. The most pronounced softening of 50% is observed for (C-11 - C-12)/2 which suggests a ferroquadrupolar ordering of O-2(0) or of O-2(2) with Gamma(3) symmetry below T-Q. (C) 1999 Elsevier Science B.V. All rights reserved.

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  • Charge fluctuation in Yb-4(As1-xSbx)(3)

    Y Nemoto, H Aoki, T Goto, A Ochiai, T Suzuki

    PHYSICA B-CONDENSED MATTER   259-61   275 - 276   1999.1

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    We present ultrasonic velocity and attenuation measurements of the Sb-substituted compounds Yb-4(As1-xSbx)(3) x = 0, 0.12, 0.24, 0.29. The results of our experiments reveal that the one-dimensional charge ordering of Yb3+ along [111] direction in Yb4As3 changes into a charge glass order in Yb-4(AS(0.71)Sb(0.29))(3). (C) 1999 Elsevier Science B.V. All rights reserved.

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  • Magnetic phase diagram and low-temperature properties of Ce0.5La0.5B6

    S Nakamura, S Sakatsume, O Suzuki, T Goto, Y Nemoto, T Horino, T Matsumura, S Kunii

    PHYSICA B-CONDENSED MATTER   259-61   36 - 37   1999.1

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    We have measured the low-temperature specific heat of Ce0.5La0.5B6 under the fields of H[1 1 0]. The present results support the non-magnetic ground state of Ce0.5La0.5B6. We confirm the absence of the phase III of Ce0.5La0.5B6 for H[1 1 0]. (C) 1999 Elsevier Science B.V. All rights reserved.

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  • 26aJ-12 Field Dependence of Quadrupolar Effect in HoB_6 and DyB_6

    Nemoto Y, Nakano Y, Goto T, Nakamura S, Kajitani T, Kunii S

    Meeting Abstracts of the Physical Society of Japan   54 ( 0 )   543 - 543   1999

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  • 29p-PSA-35 Quadrupolar Effect and Elastic Anomaly in R_3Pd_<20>Ge_6(R=La, Ce, Pr, Nd)

    HORINO T, KOMATSUBARA T, SUZUKI O, NEMOTO Y, GOTO T, DONNI A, NAKAYAMA M, KIMURA N, TATEIWA N, AOKI H

    Meeting Abstracts of the Physical Society of Japan   54 ( 0 )   445 - 445   1999

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  • 28a-D-7 Quadrupolar Response and Magnetic Phase Diagram of Ce_xLa_<1-x>B_6

    Suzuki O, Goto T, Nakamura S, Nemoto Y, Kunii S

    Meeting Abstracts of the Physical Society of Japan   54 ( 0 )   370 - 370   1999

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  • 28a-PS-64 Elastic Constants of La_<1-x>Sr_xMnO_3

    Hazama H, Nemoto Y, Goto T, Asamitsu A, Tokura Y

    Meeting Abstracts of the Physical Society of Japan   54 ( 0 )   392 - 392   1999

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  • Elastic soft mode and charge ordering of (formula presented)

    Terutaka Goto, Yuichi Nemoto, Akira Ochiai, Takashi Suzuki

    Physical Review B - Condensed Matter and Materials Physics   59 ( 1 )   269 - 276   1999

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    The elastic constant of (Formula presented) in (Formula presented) relating to the transverse ultrasonic mode shows a pronounced softening around the structural phase transition point at (Formula presented) K associated with the charge ordering of (Formula presented) and (Formula presented) states. The group theoretical analysis leads to the charge fluctuation mode with (Formula presented) symmetry coupled to the elastic strain (Formula presented) of the soft (Formula presented) mode. In a framework of the Landau phenomenological theory for the phase transition, the order parameter (Formula presented) below (Formula presented) gives rise to the linear chain of (Formula presented) ions among the body diagonal [111] direction as well as the trigonal distortion of (Formula presented) Furthermore, this theory explains experimental observations of the elastic softening (Formula presented) above (Formula presented) the structural change from cubic phase of (Formula presented) to trigonal phase of (Formula presented) and the first-order nature of the transition. © 1999 The American Physical Society.

    DOI: 10.1103/PhysRevB.59.269

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  • Ultrasonic Study for the Charge Ordering of Yb_4As_3 :

    NEMOTO Yuichi, GOTO Terutaka, OCHIAI Akira, SUZUKI Takashi

    JJAP series   11   120 - 122   1999

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  • Sm<sub>3</sub>Te<sub>4</sub>における電荷グラスと4f電子二準位系

    根本祐一, 青木英和, 後藤輝孝, 落合明

    日本物理学会講演概要集   53 ( 2 )   485 - 485   1998.9

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  • Ce<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>の弾性定数と四重極子転移 II

    鈴木修, 堀野武信, 根本祐一, 後藤輝孝, 小松原武美, 石川征靖, DOENNI A

    日本物理学会講演概要集   53 ( 2 )   442 - 442   1998.9

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  • Ultrasonic physics in the system with degree of freedom of track and charge.

    後藤輝孝, 鈴木修, 根本祐一, 間広文, 落合明, 中村慎太郎

    物性研だより   37 ( 6 )   44 - 45   1998.3

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  • Quadrupole order at TmxYb1-xTe.

    松村武, 宮内大, 鈴木孝, 根本祐一, 鈴木修, 後藤輝孝

    物性研だより   37 ( 6 )   39 - 41   1998.3

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  • Elastic Properties of La1-xSrxMnO3(x=0.165).

    間広文, 根本祐一, 鈴木修, 後藤輝孝, 朝光敦, 十倉好紀

    日本物理学会講演概要集(年会)   53 ( 1 )   381   1998.3

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  • Valence Fluctuation and Charge Ordering in Low Carrier Systems.

    根本祐一, 後藤輝孝, 落合明, 中村慎太郎, 鈴木孝

    日本物理学会講演概要集(年会)   53 ( 1 )   420   1998.3

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  • Elastic Constants and Quadrupolar Transition in Ce_3Pd_<20>Ge_6 II

    SUZUKI O, HORINO T, NEMOTO Y, GOTO T, DONNI A, KOMATSUBARA T, ISHIKAWA M

    Meeting Abstracts of the Physical Society of Japan   53 ( 0 )   442 - 442   1998

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  • Charge fluctuation in valence-fluctuating material Yb4As3. (Ministry of Education.S)

    根本祐一, 後藤輝孝, 落合明, 中村慎太郎, 鈴木孝

    強相関伝導系の物理4 平成9年度 No.06244102   85 - 89   1998

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  • Valence Fluctuation and Charge Ordering in Low Carrier Systems

    NEMOTO Y, GOTO T, OCHIAI A, NAKAMURA S, SUZUKI T

    Meeting Abstracts of the Physical Society of Japan   53 ( 0 )   420 - 420   1998

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  • Physcial Properties of U_3Pd_<20>Si_6 II

    TATEIWA N, KIMURA N, AOKI H, METOKI N, IWASA K, KOHGI K, NEMOTO Y, GOTO T, KOMATSUBARA T

    Meeting Abstracts of the Physical Society of Japan   53 ( 0 )   573 - 573   1998

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  • Elastic Properties of La _<1-x>Sr_xMnO_3(x=0.165)

    HAZAMA H, NEMOTO Y, SUZUKI O, GOTO T, ASAMITSU A, TOKURA Y

    Meeting Abstracts of the Physical Society of Japan   53 ( 0 )   381 - 381   1998

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  • Charge glass state and two-level-system of 4f electron in Sm_3Te_4

    NEMOTO Y, AOKI H, GOTO T, OCHIAI A

    Meeting Abstracts of the Physical Society of Japan   53 ( 0 )   485 - 485   1998

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  • Physcial Properties of U_3Pd_<20>Si_6 I

    TATEIWA N, KIMURA N, AOKI H, METOKI N, IWASA K, KOHGI K, NEMOTO Y, GOTO T, KOMATSUBARA T

    Meeting Abstracts of the Physical Society of Japan   53 ( 0 )   573 - 573   1998

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  • Quadrupolar Effect in Strongly Correlated Systems

    T. Goto, S. Nakamura, Y. Nemoto, O. Suzuki, A. Ochiai, S. Kunii, T. Suzuki

    Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu   7   419 - 424   1998

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    We have performed the ultrasonic measurement on the Kondo compound CexLa1-xB6 and the charge fluctuation compound Yb4As3 to examine the quadrupolar effect. The magnetic phase diagram of CexLa1-xB6 is discussed in connection with the competition of the intersite interactions of the quadrupolar and magnetic moments to the Kondo coupling. The elastic softening of the C44 mode associated with the charge ordering in Yb4As3 is explained in terms of the susceptibility for the charge fluctuation mode with Г5 symmetry. © 1998, The Japan Society of High Pressure Science and Technology. All rights reserved.

    DOI: 10.4131/jshpreview.7.419

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  • Quadrupole and Charge Fluctuation in Yb4(As1-xSbx)3 and Sm3Te4.

    根本祐一, 中村慎太郎, 後藤輝孝, 落合明, 鈴木孝

    日本物理学会講演概要集(分科会)   1997   411   1997.9

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  • Elastic Anomalies with Charge Ordering in Yb4(As1-xSbx)3.

    根本祐一, 中村慎太郎, 後藤輝孝, 落合明

    日本物理学会講演概要集(年会)   52 ( 1 Pt 3 )   474   1997.3

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  • Magnetic Phase Diagram of CexLa1-xB6.

    中村慎太郎, 後藤輝孝, 鈴木修, 根本祐一, 森田憲吾, 国井暁, 坂爪新一

    日本物理学会講演概要集(年会)   52 ( 1 Pt 3 )   515   1997.3

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  • 5a-YF-18 Quadrupole and Charge Fluctuation in Yb_4(As_<1-x>Sb_x)_3 and Sm_3Te_4

    NEMOTO Y, NAKAMURA S, GOTO T, OCHIAI A, SUZUKI T

    Meeting Abstracts of the Physical Society of Japan   52 ( 0 )   411 - 411   1997

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  • 29a-P-8 Elastic Anomalies with Charge Ordering in Yb_4(As_<1-x>Sb_x)_3

    NEMOTO Y, NAKAMURA S, GOTO T, OCHIAI A

    Meeting Abstracts of the Physical Society of Japan   52 ( 0 )   474 - 474   1997

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  • 31p-P-6 Magnetic Phase Diagram of Ce_xLa_<l-x>B_6

    Nakamura S, Goto T, suzuki, Nemoto Y, Morita K, Kunii S, Sakatsume S

    Meeting Abstracts of the Physical Society of Japan   52 ( 0 )   515 - 515   1997

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  • Elastic anomalies of charge ordering in Yb4As3

    T. Goto, Y. Nemoto, S. Nakamura, A. Ochiai, T. Suzuki

    Physica B: Condensed Matter   230-232   702 - 704   1997

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    Elastic constants of the mixed valence compound Yb4As3 with extremely low carrier 0.001 per Yb atom have been measured by the ultrasonic method. We found that the transverse C44 mode exhibits a pronounced softening around the structural phase transition point at Tc = 292 K due to the charge ordering of Yb3+ ions along 〈111〉 direction. We interpret the softening of C44 with the coupling of the strain εyz, εxy and εxy to charge fluctuation mode possessing the electric quadrupole moment in Yb3+ linear chain.

    DOI: 10.1016/S0921-4526(96)00810-1

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  • Non-Kramer’s Doublet Ground State in PrPtBi

    Hiroyuki Suzuki, Mitsuo Kasaya, Takashi Miyazaki, Yuichi Nemoto, Terutaka Goto

    Journal of the Physical Society of Japan   66 ( 9 )   2566 - 2568   1997

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    PrPtBi is found to crystallize in the cubic MgAgAs-type structure. At the specific heat, an anomaly appears at about 1.35 K, the temperature at which the entropy approaches the value ~Rln2. Data on the specific heat and magnetic susceptibility suggest that the crystalline- electric-field (C.E.F) ground state of PrPtBi is the non-Kramer’s doublet г3. Below about 2.5 K, we observe a huge softening of the elastic constant Ct, which suggests the onset of electric quadrupolar ordering. The Hall constant gives evidence that PrPtBi is a low-carrier system, as suggested from band calculations. © 1997, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

    DOI: 10.1143/JPSJ.66.2566

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  • Ultrasonic investigation of Fermi surface

    T Goto, K Morita, S Nakamura, Y Nemoto, O Suzuki, M Kataoka, S Sakatsume

    PHYSICA B-CONDENSED MATTER   219-20   86 - 88   1996.4

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    The acoustic de Haas-van Alphen effect of the quantum oscillation in the elastic constant is an excellent probe to examine the electron-lattice interaction of the itinerant electron system. In this paper we show the cryomagnetic systems for low-temperature ultrasonic measurements and the results of metallic compound LaB6 and semimetallic LaAs.

    DOI: 10.1016/0921-4526(95)00658-3

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  • Quadrupolar Response of Kondo Compound CePd<inf>2</inf>Al<inf>3</inf>

    Yuichi Nemoto, Yuichi Nemoto, Terutaka Goto, Terutaka Goto, Shintaro Nakamura, Shintaro Nakamura, Hideaki Kitazawa

    Journal of the Physical Society of Japan   65 ( 8 )   2571 - 2576   1996.1

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    The elastic constants of Kondo compound CePd2Al3with a hexagonal crystal structure have been investigated by the ultrasonic measurement. In the present single crystal we have observed absence of long range order down to 0.5 K in applying field up to 120 kOe. The elastic softening of the transverse C66mode is ascribed to the quadrupolar response for the crystalline field state of CePd2Al3. The low temperature softenings of the longitudinal C33and C11modes below the Kondo temperature Tk∼ 20 K are dominated by the Kondo singlet state.

    DOI: 10.1143/JPSJ.65.2571

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  • Research on strong-correlated electron system by ultrasonic wave. ( Ministry of Education S ).

    後藤輝孝, 中村慎太郎, 森田憲吾, 根本祐一, 鈴木修, 国井暁

    強相関伝導系の物理 平成7年度 No.06244102   47 - 48   1996

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  • Elastic Anomalies with Superconducting Transitions of UPt3.

    根本祐一, 中村慎太郎, 後藤輝孝, 大貫惇睦

    日本物理学会講演概要集(分科会)   1995 ( Autumn Pt 3 )   83   1995.9

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  • Quadrupolar Response in CexLa1-xB6 at Low Temperature. IV.

    鈴木修, 根本祐一, 森田憲吾, 中村慎太郎, 後藤輝孝, 国井暁

    日本物理学会講演概要集(分科会)   1995 ( Autumn Pt 3 )   180   1995.9

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  • Research of a quadrupole response in Ce compounds.

    根本祐一

    物性研究   64 ( 3 )   308 - 355   1995.6

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  • Elastic Properties of CePd2Al3. II.

    根本祐一, 後藤輝孝, 中村慎太郎, 北沢英明

    日本物理学会講演概要集(年会)   50th ( 3 )   149   1995.3

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  • Research Institute for Scientific Measurements.

    中村慎太郎, 後藤輝孝, 森田憲吾, 根本祐一, 鈴木修, 国井暁, 坂爪新一

    日本物理学会講演概要集(年会)   50th ( 3 )   145   1995.3

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  • Quadrupolar effects in TmTe

    T. Matsumura, Y. Haga, Y. Nemoto, S. Nakamura, T. Goto, T. Suzuki

    PHYSICA B-CONDENSED MATTER   206   380 - 382   1995.2

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    Magnetic susceptibility, elastic constant, magnetization and specific heat measurements were performed on single crystal TmTe. All of these properties are explained by considering the quadrupolar effect due to the crystal field split Gamma(8) state. We also observed a phase transition at 1.7 K in specific heat and elastic constant measurements, which is expected to be quadrupolar ordering of the Gamma(8) ground state.

    DOI: 10.1016/0921-4526(94)00465-8

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  • Elastic Anomalies with Superconducting Transitions of UPt_3

    Nemoto Y, Nakamura S, Goto T, Onuki K

    Meeting Abstracts of the Physical Society of Japan   1995 ( 0 )   83 - 83   1995

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  • Elastic Properties of CePd_2Al_3II

    Nemoto Y, Goto T, Nakamura S, Kitazawa H

    Meeting Abstracts of the Physical Society of Japan   50 ( 0 )   149 - 149   1995

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  • Quadrupolar Response in Ce_xLa_<1-x>B_6 at Low Temperature IV

    Suzuki O, Nemoto Y, Morita K, Nakamura S, Goto T, Kunii S

    Meeting Abstracts of the Physical Society of Japan   1995 ( 0 )   180 - 180   1995

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  • 30p-PSB-12 Ce_xLa_<1-x>B_6の極低温における四重極応答III

    中村 慎太郎, 後藤 輝孝, 森田 憲吾, 根本 祐一, 鈴木 修, 国井 曉, 坂爪 新一

    日本物理学会講演概要集   50 ( 0 )   145 - 145   1995

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  • Quadrupolar response in CexLa1-xB6 at low temperatures. II.

    中村慎太郎, 後藤輝孝, 森田憲吾, 根本祐一, 国井暁, 坂爪新一

    日本物理学会講演概要集(分科会)   1994 ( Autumn Pt 3 )   123   1994.9

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  • Elastic properties of CePd2Al3.

    根本祐一, 後藤輝孝, 中村慎太郎, 北沢英明

    日本物理学会講演概要集(分科会)   1994 ( Autumn Pt 3 )   125   1994.9

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  • Quadrupolar Response in CexLa1-xB6 at low temperatures.

    中村慎太郎, 後藤輝孝, 松井広志, 森田憲吾, 根本祐一, 国井暁, 坂爪新一

    日本物理学会講演概要集(年会)   49th ( 3 )   122   1994.3

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  • The magnetism and transport properties of USb and UTe. II.

    堀田英輔, 落合明, 芳賀芳範, 鈴木孝, 根本祐一, 中村慎太郎

    日本物理学会講演概要集(年会)   49th ( 3 )   5   1994.3

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  • Magnetic and Transport Properties of TmTe.

    松村武, 芳賀芳範, 根本祐一, 中村慎太郎, 後藤輝孝, 鈴木孝, LI D X

    日本物理学会講演概要集(年会)   49th ( 3 )   62   1994.3

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  • 4a-Z-4 Quadrupolar response in Ce_xLa_<1-x>B_6 at low temperatures II

    Nakamura S, Goto T, Morita K, Nemoto Y, Kunii S, Sakatsume S

    Meeting Abstracts of the Physical Society of Japan   1994 ( 0 )   123 - 123   1994

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  • 30p-YN-15 Quadrupolar Response in Ce_xLa_<1-x>B_6 at low temperatures

    Nakamura S, Goto T, Matsui H, Morita K, Nemoto Y, Kunii S, Sakatsume S

    Meeting Abstracts of the Physical Society of Japan   49 ( 0 )   122 - 122   1994

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  • 29a-YN-12 Magnetic and Transport Properties of TmTe

    Matsumura T, Li D.X, Haga Y, Nemoto Y, Nakamura S, Goto T, Suzuki T

    Meeting Abstracts of the Physical Society of Japan   49 ( 0 )   62 - 62   1994

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  • 4a-Z-8 Elastic properties of CePd_2Al_3

    Nemoto Y, Goto T, Nakamura S, Kitazawa H

    Meeting Abstracts of the Physical Society of Japan   1994 ( 0 )   125 - 125   1994

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  • 28a-YN-10 The magnetism and transport properties of USb and UTe II

    Hotta E, Ochiai A, Haga Y, Suzuki T, Nemoto Y, Nakamura S

    Meeting Abstracts of the Physical Society of Japan   49 ( 0 )   5 - 5   1994

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  • Ultrasonic Attenuation of Yb4As3.

    根本祐一, 中村慎太郎, 後藤輝孝, 落合明, 田巻明, 鈴木孝

    日本物理学会講演概要集(分科会)   1993 ( Autumn Pt 3 )   143   1993.9

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  • 14a-PS-19 Ultrasonic Attenuation of Yb_4As_3

    Nemoto Y, Nakamura S, Goto T, Ochiai A, Tamaki A, Suzuki T

    Meeting Abstracts of the Physical Society of Japan   1993 ( 0 )   143 - 143   1993

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Presentations

  • Observation and evaluation of vacancy in silicon wafers using ultrasound method

    Yuichi Nemoto

    2020.2 

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  • Symmetry breaking with multipoles coupled to strain and rotation in iron pnictide superconductors Invited

    NEMOTO Yuichi

    2018.3 

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  • 超音波によるシリコン原子空孔の量子状態解明と産業応用への展望 Invited

    根本 祐一

    日本学術振興会第239回研究会,材料の微細組織と機能性第133委員会  2018.1 

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  • Observation of vacancy orbital in silicon crystals using low-temperature ultrasonic measurements Invited International conference

    NEMOTO Yuichi

    29th International Conference on Defects in Semiconductors  2017.7 

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  • 原子レベルのウェーハ欠陥検出技術徹底解説

    根本 祐一

    電子ジャーナル誌主催セミナー  2014.10 

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  • 超音波で観る量子力学の世界 Invited

    根本 祐一

    日本物理学会北陸支部特別学術講演会  2014.7 

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  • 超音波による準結晶と近似結晶における電子格子物性の解明

    Grant number:22H04586

    2022.4 - 2024.3

    System name:科学研究費助成事業 新学術領域研究(研究領域提案型)

    Research category:新学術領域研究(研究領域提案型)

    Awarding organization:日本学術振興会

    根本 祐一

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    Grant amount:\8450000 ( Direct Cost: \6500000 、 Indirect Cost:\1950000 )

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  • Development of surface acoustic wave devices and its application to strongly correlated electron systems

    Grant number:15K13518

    2015.4 - 2018.3

    System name:KAKENHI

    Research category:Grant-in-Aid for Challenging Exploratory Research

    Awarding organization:Japan Society for The Promotion of Science

    NEMOTO Yuichi

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    Authorship:Principal investigator  Grant type:Competitive

    Observation of vacancy in silicon crystal and elucidation of its electronic state is a challenging issue in both solid-state physics and application technologies. We successfully observe vacancy orbital through elastic softening with decreasing temperature by using ultrasound measurements. Extended vacancy orbital leads to extremely strong quadrupole-strain interaction, which allows us to observe elastic softening at low temperatures even in dilute vacancy below 1 ppb. Especially, evaluation of vacancy concentration in a surface region of highly qualified silicon wafers is desirable for control of micro defects, that originates in vacancy, about nanometer in size. A benchmark of the achievement of surface acoustic wave with high frequency measurements will be a powerful evaluating method in rapidly advancing semiconductor industry.

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  • Surface acoustic wave investigation of vacancy orbital in silicon wafer

    Grant number:26247059

    2014.6 - 2017.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Research category:Grant-in-Aid for Scientific Research (A)

    Awarding organization:Japan Society for the Promotion of Science

    GOTO Terutaka, AKATSU Mitsuhiro, MITSUMOTO Keisuke, KURIHARA Ryosuke, KASHIMA Kazuhiko, SAITO Hiroyuki, FURUMURA Yuji, SAITO Yoshihiko

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    Grant amount:\40560000 ( Direct Cost: \31200000 、 Indirect Cost:\9360000 )

    Ultrasonic investigation on the vacancy in silicon wafers currently used in semiconductor device fabrications is an important issue for both solid-state physics and technological applications. The electron orbital bounded around the vacancy exhibiting largely extended radius possesses the strong quadrupole-strain interaction. This provides us the sizable softening in the elastic constants caused by the vacancies existing in extremely small concentration of a vacancy per 10E10 Si atoms. In the present research, we have employed the surface acoustic wave (SAW) device to generate the Rayleigh wave propagating on the surface of the silicon wafer. We have observed the softening of the Rayleigh wave and its magnetic field dependence. We have found the interaction Hamiltonian for the vacancy orbital and the Rayleigh wave and analyzed the softening by the quadrupole susceptibility. We will develop the vacancy evaluation as a new semiconductor technology in near future.

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  • Study of dissipative quantum state by means of high-frequency ultrasonic devices processed by micromachining

    Grant number:23654116

    2011.4 - 2013.3

    System name:KAKENHI

    Research category:Grant-in-Aid for Challenging Exploratory Research

    Awarding organization:Japan Society for The Promotion of Science

    NEMOTO Yuichi

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    Authorship:Principal investigator  Grant type:Competitive

    We usually use a variety of piezoelectric transducers for generation and detecting of ultrasound signals in low-temperature measurements of elastic constants and ultrasonic attenuation coefficients. In this work, we tried to make high-frequency transducers developed by using processing technology. At first, basic process is involved in manufacturing inverted mesa-type crystals. The thickness of limited central area of conventional AT-cut quarts crystal is etched down to 5 μm for desired frequency over 150 MHz with fundamental mode. We successfully made devices with fundamental frequency of 260 MHz with blanks and applied to measure the elasticconstant C44 in Ce_3Pd_20Ge_6 with inverted mesa-type AT-cut quarts transducer. On the other hand, we found it is difficult to etch practically the LiNbO_3 and LiTaO_3 in thesame process with quarts crystal. The advanced technique using nano-particle fluid is nowdeveloped utilizing for inverted mesa-type tips made of LiNbO_3.

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  • 超音波計測による強相関量子系物理の国際共同研究

    2010.4 - 2013.3

    System name:頭脳循環を加速する若手研究者海外派遣プログラム

    Awarding organization:日本学術振興会

    後藤 輝孝, 実施担当者, 根本 祐一

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    Authorship:Principal investigator  Grant type:Competitive

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  • Study of rattling and electron-phonon interaction in cage-structured compounds

    Grant number:21340097

    2009.4 - 2013.3

    System name:KAKENHI

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for The Promotion of Science

    NEMOTO Yuichi

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    Authorship:Principal investigator  Grant type:Competitive

    We have performed systematic ultrasonic measurement on 3-20-6 type clathrate compounds and filled-skutterudite compounds to elucidate rattling and tunneling with cage-like nano-space. In the R_3Pd_20Ge_6 multi-structured ultrasonic dispersions in the elastic constant C_44 were observed. On the other hand, we revealed rattling does not emerge in the R_3Pd_20Si_6. These results evidences that conduction bands participate in the formation of anharmonic vibration with Γ_5-type charge fluctuation using the path of electron-phonon interaction. In addition, we found antiferro-type qoadrupole ordering of 8c site at 250 mK and successively of 4a site at 60 mK in Pr_3Pd_20Ge_6.

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  • Strongly correlated quantum phase associated with charge fluctuation

    Grant number:18002008

    2006 - 2010

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research

    Research category:Grant-in-Aid for Specially Promoted Research

    Awarding organization:Japan Society for the Promotion of Science

    GOTO Terutaka, NEMOTO Yuichi, KITAZAWA Hideaki, SUZUKI Hiroyuki, KANETA Hiroshi, YANAGISAWA Tatsuya, IYETOMI Hiroshi, ONO Yoshiaki, TAKEDA Naoya, TSURUTA Kenji, SAKAI Osamu, AKATSU Mitsuhiro, ISHII Isamu, MITSUMOTO Keisuke

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    Grant amount:\284440000 ( Direct Cost: \218800000 、 Indirect Cost:\65640000 )

    The ultrasonic strains have specified symmetries and couple to the electric quadrupoles of the electronic and ionic quantum states. The ultrasonic measurements of the elastic constants and attenuation coefficients, therefore, may determine the quadrupole susceptibility. In the present projects, using low-temperature ultrasonic phase difference measurement apparatus with a highly velocity resolution, we have carried out a study of non-Kramers doublet of localized 4f-electron in rare-earth compounds, rattling of local oscillator in clathrate compounds, vacancy orbital in boron-doped silicon crystal in pursuing strongly correlated quantum phases associated with charge fluctuation.

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  • Ultrasonic Study of rattling in clathrate compounds

    Grant number:17540318

    2005.4 - 2007.3

    System name:KAKENHI

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for The Promotion of Science

    NEMOTO Yuichi

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    Authorship:Principal investigator  Grant type:Competitive

    1)We previously observed ultrasonic disperSi_6n due to rattling in heavy-fermion superconductor PrOs_4Sb_<12>. Furthermore, elastic softening proportional to the 1/T was found below 4 K down to T_c=1.85 K, which is attributed to off-center tunneling of Pr ion in a cage. These results support that the strong correlation between rattling/tunneling and heavy-fermion and it's superconductivity in PrOs_4Sb_<12>.
    2)We have made ultrasonic experiments of the Ru substitutional Pr(Os_<1-x>RuX)_4Sb_<12>. As a result, ultrasonic disperSi_6n becomes weak with more substitution of Ru concentration and completely disappears in BCS superconductor PrRu_4Sb_<12>. We proposed that the coupling between the off-center tunneling and conduction electrons will cause the heavy-fermion state and superconductivity in PrOs_4Sb_<12>.
    3)We have examined LaOs_4Sb_<12> without 4f-electron in order to investigate the correlation between rattling and 4f electrons. Ultrasonic disperSi_6n in C_<11> was clearly observed, that means rattling appears without 4f-electron. We conclude that the coupling between off-center mode and surrounding conduction electrons is crucial for the rattling and tunneling.
    4)We have measured elastic constants of NdOs_4Sb_<12> with three 4f electrons. Two distinct ultrasonic disperSi_6ns around 40 K and 15 K were observed in C_<11>. This result indicates that multiple structure of anharmonic potential is formed in a cage as it were, illustrated by two deferent activation energy E and characteristic time τ_0 of the rattling in NdOs_4Sb_<12>.
    5)We have observed elastic softening of C_<11> and C_<44> proportional to the 1/T at low temperatures in NdOs_4Sb_<12>. According to the analysis using quadrupolar susceptibility, we confirmed that the ground state of the crystal field levels of 4f^3 electronic state is Γ_<67> quartet in NdOs_4Sb_<12>.
    6)We have performed ultrasonic measurements of isomorphic compound La_3Pd_<20>Si_6 and Ce_3Pd_<20>Si_6 to study rattling and tunneling. As a result, no ultrasonic dispersions were found in La_3Pd_<20>Si_6 and Ce_3Pd_<20>Si_6 contrary to our previous results of R_3Pd_<20>_Ge6. Here we report that the importance of the conduction bands as well as clathrate structure for the occurrence of rattling and tunneling.
    7)We have observed elastic softening of (C_<11>-C_<12>)/2 and C_<44> proportional to the 1/T at low temperatures in Ce_3Pd_<20>Si_6. We obtained crystal field levels by use of quadrupolar susceptibility to be a Γ_8 quarter ground at 8c site and a Γ_7 doublet ground at 4a site, respectively. Furthermore, we revealed that the presence of antiferro-quadrupolar ordering phase in magnetic fields.

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  • 充填スクッテルダイト化合物の超音波物性と電子格子相互作用の研究

    Grant number:15072202

    2003 - 2007

    System name:科学研究費助成事業 特定領域研究

    Research category:特定領域研究

    Awarding organization:日本学術振興会

    吉澤 正人, 大野 義章, 鈴木 孝至, 根本 祐一, 松川 倫明, 中西 良樹, 後藤 輝孝

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    Grant amount:\118900000 ( Direct Cost: \118900000 )

    1)SmRu_4P_<12>について、特徴的な弾性定数の磁場角度依存性を観測し、この系で実現していると考えられている八極子秩序との関係を論じた。また、軌道角運動を有しないEuRu_4Sb_<12>の弾性定数の磁場中での弾性定数の温度依存性を測定し、充填スクッテルダイト化合物のLS結合描像とjj結合描像の妥当性に関する検討を行った。
    2)複雑な磁気相図から多極子秩序の可能性が指摘されているTbRu_4P_<12>について、圧力下・磁場中の弾性定数の温度依存性を測定し、顕著な弾性軟化現象とその磁場・圧力依存性を観測した。
    3)新しい重い電子系カゴ状化合物TbT_2Zn_<20>(T:Co,Ir,Rh)の弾性定数の温度依存性を測定し、この系の結晶場基底状態に関する知見を得た。
    4)4f電子の存在しないBCS型超伝導体LaOs_4Sb_<12>の超音波実験を行い、ラットリングにともなう超音波分散現象とトンネリングにともなう低温ソフト化を観測した。PrOs_4Sb_<12>とは異なり20mKの極低温でも弾性定数の軟化は続き、この結果から、PrOs_4Sb_<12>ではラットリングやトンネリングの電荷揺らぎが重い電子状態や超伝導に深く関係していることを示した。
    5)NdOs_4Sb_<12>では2つの異なる温度領域に超音波分散現象を観測し、ラットリングの起源となる非調和性に構造があることを示した。また、ROs_4Sb_<12>のラットリングパラメータτ_0とEの系統的な整理を行い、4f電子の違いによる効果を見いだし、局所振動と伝導電子との結合に加え、4f電子と伝導電子との結合がラットリングに重要な相互作用であることを示した。
    6)LaFe_4Sb_<12>に対して、剪断モード弾性率C_<44>において、30Kから80Kまでの温度範囲に弾性率の周波数分散が明確に存在することを発見し、ラットリング運動の存在を証明した。
    7)Type-I立方晶構造を有するクラスレートEu_8Ga_<16>Ge_<30>について、剪断モード弾性率(C_<11>-C_<l2>)/2において、温度50Kから100Kの領域で弾性率の超音波分散を見出した。超音波吸収係数の温度依存性に明確な分散を観測し、本物質におけるラットリング運動の存在を強く示唆する結果を得た。

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  • Lattice and ultrasonic effects of orbital ordering and fluctuation

    Grant number:11220205

    1999 - 2001

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas (B)

    Research category:Grant-in-Aid for Scientific Research on Priority Areas (B)

    Awarding organization:Japan Society for the Promotion of Science

    GOTO Terutaka, KUSAKABE Koichi, HASEGAWA Akira, NEMOTO Yuichi, IYETOMI Hiroshi

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    Grant amount:\42700000 ( Direct Cost: \42700000 )

    In the present project we have investigated on orbital orderings and fluctuations by use of the coupling of the elastic strain of sound waves to the quadrupole of the orbital degrees of freedom. By the ultrasonic measurements, we have investigated the magnetic phase diagram of Ce_xLa_<1-x>B_6 with ヲ」_8 ground state. In the compound x=0.75 the ordered phase IV changes into the antiferro-magnetic phase III. In more diluted compounds x=0.70 and 0.65, however, the phase IV is stable down to absolute zero. The ultrasonic measurements show significant difference in low-temperature limit of C_<44>ofx=0.70, 0.65 and that of x=0.60, 0.50. We have deduced, therefore, that the compounds x=0.60 and 0.50 falls into a non-magnetic ground state showing no distinct phase transition. This is consistent with the previous specific heat measurements by Nakamura et al. In order to examine the order parameter of the phase IV, we have made thermal expansion measurements showing an expansion along the (001) direction and a shrink along the(111) direction in phase IV. This result is a proof for a trigonal distortion in phase IV indicating a quadrupole ordering O_<yz>=O_<zx>=O_<xy>。・.
    We。。have。。found that tetragonal ternary compounds HoB_2C_2 and DyB_2C_2 exhibit softenings in (C_<11>-C_<12>)/2, C_<44>, C_<66>. These results indicate a pseudo-triplet model consisting of E-doublet and B or A singlet is responsible for HoB_2C_2 and a pseudo-quartet model with E_<1/2> doublet and E_<3/2> doublet is for DyB_2C_2. We have also performed ultrasonic investigation on La_<1-x>Sr_xMnO_3 and Pr_xCa_<1-x>MnO_3 to investigate their orbital orderings. We have commonly observed the softening in (C_<11>-C_<12>)/2, in para-phase, where the Jahn-Teller coupling of quadrupoles O^0_2 and O^2_2 of E_g doublet is responsible. We obtained the energy gain 10。チ100K, which is considerable smaller than that in Mills' theory. The elastic softening in C_<44> due to charge ordering in Pr_xCa_<1-x>MnO_3 with x=0.50 has been found. We have successfully applied the Landau theory to explain the charge ordering of the system associated with the softening of C_<44>.

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  • Ultrasonic study of quadrupole-strain coupling of silicon vacancy

    Grant number:15K17704

    2015.4 - 2019.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Research category:Grant-in-Aid for Young Scientists (B)

    Awarding organization:Japan Society for the Promotion of Science

    MITSUMOTO Keisuke, NEMOTO Yuichi, AKATSU Mitsuhiro, GOTO Terutaka

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    Observation of vacancies in crystalline silicon and elucidation of its electronic state are important issues in terms of basic and applied researches. There are rare vacancies in the crystalline silicon currently used in semiconductor industry, and the electronic state of the vacancy has cubic symmetry. We elucidated a mechanism for coupling electric quadrupoles of the vacancy and ultrasonic strains by measuring of pressure dependence of the softening of elastic constant and analyzing them with electric quadrupole susceptibilities. When concentration of the vacancy is above a critical concentration, the vacancy deforms from cubic to lower symmetry due to development of the quadrupole-strain coupling. This is consistent with previous and famous studies of the electron spin resonance.

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  • Determination of formation energy of single vacancy in silicon by means of rapir queching of high-temperature thermal euilibrium

    Grant number:26390055

    2014.4 - 2018.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    Kaneta Hiroshi, NEMOTO Yuichi, GOTO Terutaka

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    Grant amount:\4940000 ( Direct Cost: \3800000 、 Indirect Cost:\1140000 )

    The silicon wafers were annealed at high-temperatures, to successfully realize the thermal equilibrium of defects in the silicon wafers. The wafers were then quenched. The concentrations of the quenched-in vacancies were determined by means of the low-temperature ultrasonic measurement for the softening of the elastic constant C44. By applying our theory of low-temperature elastic softening to the measured softening, we determined the concentration of quenched-in vacancies. Using these values, we evaluated the formation energy of the vacancy. The obtained value for the formation energy was smaller than expected from the conventional knowledge. We however clarified the reason for the disagreement: imperfect quenching with insufficient cooling rate and neglect of the out-diffusion of the vacancies. We conclude that our experimental approach will allow us to derive the accurate value of the vacancy’s formation energy, if these inappropriate procedures in the experiment will be corrected.

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  • Determination of absolute value of vacancy concentration for silicon crystal using low-temperature ultrasonic measurement

    Grant number:21560012

    2009 - 2011

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    KANETA Hiroshi, GOTO Terutaka, NEMOTO Yuichi

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    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

    Regarding the sample preparation in this study performed by the annealing furnace in the laboratory of university-level cleanness, we have found the following two problems :(1) The cleanness of the laboratory is totally inadequate in order to anneal well-cleaned samples in the contamination-free ambient.(2) The cooling(quenching) speed is insufficient to freeze the vacancies which are in thermal equilibrium in the annealing. We have found that the best way to resolve these problems is to prepare the samples by using the apparatuses and facilities in silicon wafer manufacturing company. The level of the cleanness of the apparatus and the clean room is far higher than that of those in the university. The quenching with sufficiently high speed can also be realized by the rapid thermal annealer(RAT) adopted in silicon wafer manufacturing. In this case however, we have to deal with the silicon wafers of surface orientation<001> and the thickness thinner than 0. 8 mm, instead of the block-shaped samples we first considered for the experiment. In this case, we also have to totally change the regular condition of the ultrasonic measurement into a special one, where we measure the elastic constantC11 by using the longitudinal sound wave propagating along<001> direction through the very thin sample(wafer). We have shown that this method of measurement for the elastic softening is possible. Sample preparation using the RTA in silicon wafer manufacturer is now in progress.

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  • Single crystal growth of cubic rare earth compounds with integer quantum number of rare earths and studies of anomalous properties reflecting the quadrupole interactions

    Grant number:21540356

    2009 - 2011

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    ISIKAWA Yosikazu, KUWAI Tomohiko, MIZUSHIMA Toshio, PASCAL LEJAY Neel institut

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    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    Interested in the praseodymium compounds showing the heavy-fermion-like behavior, we considered the origin of this property reflects the quadrupole moments. In this study we carried out the experiments of specific heat, thermo electric power, and magnetization of cubic rare-earth compounds with integer quantum number of rare earths. Anomalous properties of these compounds are analyzed taking into account of the coexistence of magnetic and quadrupole moments.

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  • Spectroscopic studies on novel electronic phase due to large amplitude atomic oscillations

    Grant number:20102005

    2008 - 2012

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Research category:Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Awarding organization:Japan Society for the Promotion of Science

    TOU Hideki, SUZUKI Takashi, UDAGAWA Masayuki, IWASA Kazuaki, LEE Chul-ho, TSUTSUI Satoshi, NEMOTO Yuichi, ALFRED Baron, URUGA Tomoya

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    Grant amount:\167440000 ( Direct Cost: \128800000 、 Indirect Cost:\38640000 )

    NMR, ultrasonic, Raman scattering, X-ray scattering, and inelastic neutron scattering experiments were carried out to clarify the properties of the ground state in caged compounds. (1) The rattling motions of guest atoms in type -I clathrates correspond to the characteristic temperature scale of 20-30 K, and strongly interact with conduction electron states. Significant electron-local phonon coupling leads to enhancement of various physical quantities. (2) The heavy fermion behavior in ROs4Sb12 is attributed to the correlation between the conduction electrons and the lowest energy excitation, either rattling state or crystal electric field (CEF) state. (3) The primary order parameter of SmRu_4P_<12> is found to be an octupole T^α, or T^β. (4) Phonon anomalies in GdB_6 and DyB_6 are expected to be caused by strong electron-phonon interaction. (5) The structural phase transition observed in RT_2Xn_<20> is attributed to rattling transition due to the strong electro-phonon coupling. In PrIr_2Zn_<20>, the rattling transition is suppressed and the antiferroquadrupolar ordering occurs at T_Q.

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  • Novel Magnetism and Superconductivity on Filled Skutterudite Compounds which Possess Rattling

    Grant number:20740192

    2008 - 2009

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Research category:Grant-in-Aid for Young Scientists (B)

    Awarding organization:Japan Society for the Promotion of Science

    YANAGISAWA Tatsuya, GOTO Terutaka, TAKEDA Naoya, NEMOTO Yuichi, MAPLE M. Brian, E. BAUMBACH Ryan, HO Pei-Chun

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    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    Ultrasonic measurements on the Filled-Skutterudite compounds Pr_<1-x>NdxOs_4Sb_<12>(x=0.45, 0.25, 1.0)have been performed. Frequency dependences of elastic constant C11 were investigated with longitudinal ultrasonic frequencies varying between 34 to 245 MHz on these samples. A characteristic ultrasonic dispersion, which had also been observed in PrOs_4Sb_<12> (x=0) at around 30K, is also observed in the dilute systems and shifts gradually to higher temperature with increasing the Nd concentration x. On the other hand, the C11 of x=0.45 sample shows softening and levels off feature at T=0.25K. This result implies that the Nd3+ ion's degenerate CEF ground state is split due to some order even in the Pr^<3+> ion's contribution to SC. In addition, a magnetically robust elastic softening of C11 was found in the end material NdOs_4Sb_<12> (x=1.0) under magnetic field 2 T<H<10T at low temperature T<1K, which suggest a presence of the off-center tunneling as same as LaOs_4Sb_<12> and PrOs_4Sb_<12>. Above results imply that an origin of the heavy-fermion state of NdOs_4Sb_<12> could possibly be related to a degenerate quantum ground state due to the off-center degrees of freedom.

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  • The study on enhancement effect of photocatalytsis under visible light irradiation with the oxide photocatalysts

    Grant number:14350341

    2002 - 2004

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    YAMADA Yuh, KUBO Syugo, MATSUSHITA Akiyuki, YE Jinhua, GOTO Terutaka, NEMOTO Yuichi

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    Grant amount:\13500000 ( Direct Cost: \13500000 )

    Since photo-induced decomposition of water on TiO_2 electrodes was discovered, semiconductor-based photocatalysis has attracted extensive interest. Most of the investigations have focused on TiO_2, which shows relatively high activity and chemical stability under UV light irradiation. Therefore, there is an urgent need to develop new types of photocatalysts that can yield high activity under visible light irradiation, because the attempt is aimed at producing hydrogen of clean-energy from water utilizing solar energy. We have investigated the electric and crystal structural changes on the oxide photocatalysts, resulting in a change in photocatalytLc property. The results are explained in the following.
    1.In addition to the reported InTaO_4 and InNbO_4 photocatalysts, 3d transition metal V compound InVO_4 was found to be a visible light driven photocatalyst for H_2 evolution from pure water. Then, we have also investigated the substitute system MVO_4 under high pressure. We found the phase transition in CeVO_4 up to 6 GPa.
    2.We have demonstrated efficiently photocatalytic degradation of methylene blue dye over the oxide photocatalyst R_2BaCuO_5(R=lanthanoid) under visible light irradiation. Nd_2BaCuO_5 oxide was found the high activity under visible light irradiation.
    3.We have found superconductivity in the Pr_2Ba_4Cu_7O_<15-δ> possessing metallic double chains when the oxide photocatalysts were searched.

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  • Study of the acoustic de Haas effect by the ultrasonic measurements

    Grant number:09304039

    1997 - 1999

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Research category:Grant-in-Aid for Scientific Research (A)

    Awarding organization:Japan Society for the Promotion of Science

    GOTO Terutaka, DONNI Andreas, OCHIAI Akira, HASEGAWA Akira, KATAOKA Mitsuo, NEMOTO Yuichi

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    Grant amount:\41200000 ( Direct Cost: \41200000 )

    The de Haas effect of the oscillatory magnetization is a method to observe the Fermi surface of metallic compounds. The acoustic de Haas effect by the measurement of the sound velocity and attenuation coefficient is a unique method to determine the electron-lattice interaction in the itinerant electron system. In the present project, we focus on the precise measurement of the sound velocity as a function of the magnetic field at low temperatures. In the case of the heavy Fermion system, the measurements in the extreme condition with low temperature and high magnetic field is required to detect the quantum oscillation due to the Landau state in field. In the last three years, we have developed an low-temperature ultrasonic system with a superconducting magnet up to 180kOe and a dilution refrigerator down to 10mK. The top-loading probe of the dilution refrigerator is equipped by a gonio meter for sample rotation and coaxial lines for high frequency measurement. For the first cooling, we measured a typical example of the heavy Fermion systems CeRuィイD22ィエD2SiィイD22ィエD2, which has been grown by Prof. Onuki. Above the metamagetic transition of 80kOe, the quantum oscillation of the longitudinal CィイD211ィエD2 mode has been clearly detected below 600mK down to 20mK. The effective mass of the branch is 3.5m0. The ultrasonic measurement system in low temperature and high magnetic field in Niigata University is the most excellent apparatus for the investigation of the Fermi surface of the heavy Fermion system, the quadrupolar effect of 4f- and 3d-elecron compounds and the charge fluctuation effect in the mixed valence compounds. Our ultrasonic system is opened for cooperative works with many scientist in the world.

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Teaching Experience

  • 先端科学技術総論

    2023
    Institution name:新潟大学

  • 日本事情自然系A

    2023
    Institution name:新潟大学

  • 量子研究の最前線

    2023
    Institution name:新潟大学

  • 理学基礎演習

    2022
    Institution name:新潟大学

  • 固体物性物理学III

    2022
    Institution name:新潟大学

  • 物理学特論IV

    2022
    Institution name:新潟大学

  • 物理学演習C

    2021
    Institution name:新潟大学

  • 物理学演習D

    2021
    Institution name:新潟大学

  • 強相関物理学II

    2021
    Institution name:新潟大学

  • 現代物理学セミナーA

    2020
    Institution name:新潟大学

  • 現代物理学セミナーB

    2020
    Institution name:新潟大学

  • 専門力アクティブ・ラーニング

    2020
    Institution name:新潟大学

  • Physics TodayⅡ

    2020
    Institution name:新潟大学

  • 物性物理学

    2019
    Institution name:新潟大学

  • 理学スタディ・スキルズ

    2019
    -
    2021
    Institution name:新潟大学

  • 物理学演習A

    2018
    Institution name:新潟大学

  • 課題研究C

    2018
    Institution name:新潟大学

  • 課題研究D

    2018
    Institution name:新潟大学

  • 課題研究B

    2018
    Institution name:新潟大学

  • 課題研究A

    2018
    Institution name:新潟大学

  • 物理学実験B

    2017
    Institution name:新潟大学

  • 物理学実験A

    2017
    Institution name:新潟大学

  • 物理学演習B

    2017
    Institution name:新潟大学

  • 物理学実験C

    2017
    Institution name:新潟大学

  • 物理学実験D

    2017
    -
    2022
    Institution name:新潟大学

  • 基礎ベクトル解析

    2017
    -
    2020
    Institution name:新潟大学

  • 総合力アクティブ・ラーニング

    2017
    -
    2019
    Institution name:新潟大学

  • 安全教育

    2016
    Institution name:新潟大学

  • プロジェクト研究特別概説

    2014
    Institution name:新潟大学

  • 課題探索特講

    2014
    Institution name:新潟大学

  • 物理学基礎CⅡ

    2013
    -
    2016
    Institution name:新潟大学

  • 数理物質科学特定研究ⅡB(物理学)

    2013
    -
    2015
    Institution name:新潟大学

  • 数理物質科学特定研究Ⅰ(物理学)

    2013
    -
    2015
    Institution name:新潟大学

  • 数理物質科学演習Ⅰ(物理学)

    2013
    -
    2015
    Institution name:新潟大学

  • 数理物質科学演習Ⅱ(物理学)

    2013
    -
    2015
    Institution name:新潟大学

  • コラボレーション演習

    2013
    -
    2015
    Institution name:新潟大学

  • 数理物質科学特定研究ⅡA(物理学)

    2013
    -
    2015
    Institution name:新潟大学

  • 現代物理学への招待(物理学学習法)

    2013
    -
    2014
    Institution name:新潟大学

  • 化学実験

    2009
    -
    2017
    Institution name:新潟大学

  • 物理学実験b

    2009
    Institution name:新潟大学

  • 物理学実験a

    2009
    Institution name:新潟大学

  • 物理学実験

    2009
    Institution name:新潟大学

  • 固体物性物理学Ⅲ

    2008
    -
    2020
    Institution name:新潟大学

  • 物性物理学I

    2008
    -
    2017
    Institution name:新潟大学

  • 強相関物理学Ⅱ

    2008
    -
    2017
    Institution name:新潟大学

  • 固体物性物理学III

    2007
    -
    2022
    Institution name:新潟大学

  • 強相関物理学II

    2007
    -
    2021
    Institution name:新潟大学

  • 物理学基礎ゼミ

    2007
    -
    2018
    Institution name:新潟大学

  • 現代物理学

    2007
    -
    2018
    Institution name:新潟大学

  • 電磁気学演習

    2007
    -
    2016
    Institution name:新潟大学

  • 計測学

    2007
    -
    2011
    Institution name:新潟大学

  • 課題研究a

    2007
    Institution name:新潟大学

  • 課題研究b

    2007
    Institution name:新潟大学

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