Updated on 2023/02/05

写真a

 
AKATSU Mitsuhiro
 
Organization
Academic Assembly Institute of Science and Technology Fundamental Sciences Assistant Professor
Faculty of Science Department of Science Assistant Professor
Title
Assistant Professor
External link

Degree

  • 博士(理学) ( 2004.3   新潟大学 )

Research Interests

  • 強相関電子系,超音波,四極子,超伝導,磁性,極低温,強磁場,高圧

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

Research History (researchmap)

  • Niigata University   Faculty of Science Department of Science   Assistant Professor

    2017.4

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  • Niigata University   Faculty of Science Department of Physics   Assistant Professor

    2013.7 - 2017.3

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  • Niigata University   Graduate School of Science and Technology

    2012.4 - 2013.6

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    Country:Japan

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  • Dresden High Magnetic Field Laboratory

    2012.4 - 2013.3

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    Country:Germany

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  • Niigata University   Graduate School of Science and Technology   Specially Appointed Assistant Professor

    2009.4 - 2012.3

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  • Niigata University   Graduate School of Science and Technology   Part-time researcher for university or other academic organization

    2008.4 - 2009.3

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  • The University of Tokyo   Part-time researcher for university or other academic organization

    2006.4 - 2008.3

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  • 産業技術総合研究所   大学等非常勤研究員

    2004.4 - 2006.3

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Research History

  • Niigata University   Faculty of Science Department of Science   Assistant Professor

    2017.4

  • Niigata University   Abolition organization Condensed Matter Physics   Assistant Professor

    2013.7 - 2017.3

  • Niigata University   Graduate School of Science and Technology   Specially Appointed Assistant Professor

    2009.4 - 2013.3

  • Niigata University   Graduate School of Science and Technology   Part-time researcher for university or other academic organization

    2008.4 - 2009.4

  • Niigata University   Graduate School of Science and Technology   Part-time researcher for university or other academic organization

    2008.4 - 2009.3

Education

  • Niigata University   Graduate School, Division of Science and Technology

    2001.4 - 2004.3

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    Country: Japan

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  • Niigata University   Graduate School, Division of Science and Technology

    1999.4 - 2001.3

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    Country: Japan

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  • Niigata University   Faculty of Science   Physics

    1995.4 - 1999.3

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    Country: Japan

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Professional Memberships

Studying abroad experiences

  • Dresden High Field Laboratory   Guest scientist

    2012.4 - 2013.3

Qualification acquired

  • Hang Up and Remove Work Skill Person

  • Usual Car License (first kind)

 

Papers

  • Magnetic Bragg peak enhancement under ultrasound injection

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

    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

  • Spin Wave Excitations in Honeycomb Antiferromagnet MnTiO3

    In Yong Hwang, Kee Hwan Lee, Jae-Ho Chung, Kazuhiko Ikeuchi, V. Ovidiu Garlea, Hiroki Yamauchi, Mitsuhiro Akatsu, Shin-ichi Shamoto

    Journal of the Physical Society of Japan   90 ( 6 )   064708 - 064708   2021.6

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    Publishing type:Research paper (scientific journal)   Publisher:Physical Society of Japan  

    DOI: 10.7566/jpsj.90.064708

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  • Ultralow-energy magnon anomaly in yttrium iron garnet Reviewed

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

    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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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevResearch.2.033235/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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  • 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   012120 - 012120   2018.3

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    Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

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

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    Other Link: http://stacks.iop.org/1742-6596/969/i=1/a=012120?key=crossref.8ed79a65286b9349ac7d7d57c9f72027

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

    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 R (3) over bar. 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, J(aa), J(ad), and J(dd), 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 chi ''(E) exhibits a square-root energy dependence at low energies. The magnon density of state is estimated from chi ''(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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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.97.054429/fulltext

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

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

    Journal of the Physical Society of Japan   86 ( 6 )   064706-1 - 064706-27   2017.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Physical Society of 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(Fe<sub>1−</sub><italic><sub>x</sub></italic>Co<italic><sub>x</sub></italic>)<sub>2</sub>As<sub>2</sub>. The attenuation coefficient α<sub>L[110]</sub>of the longitudinal ultrasonic wave for (<italic>C</italic><sub>11</sub>+ <italic>C</italic><sub>12</sub>+ 2<italic>C</italic><sub>66</sub>)/2 for <italic>x</italic>= 0.036 reveals the critical slowing down of the relaxation time around the structural transition at <italic>T</italic><sub>s</sub>= 65 K, which is caused by ferro-type ordering of the quadrupole <inline-formula><tex-math version="MathJax"><![CDATA[\(O_{x'^{2} - y'^{2 } }\)]]></tex-math></inline-formula>coupled to the strain ε<italic><sub>xy</sub></italic>. The attenuation coefficient α<sub>66</sub>of the transverse ultrasonic wave for <italic>C</italic><sub>66</sub>for <italic>x</italic>= 0.071 also exhibits the critical slowing down around the superconducting transition at <italic>T</italic><sub>SC</sub>= 23 K, which is caused by ferro-type ordering of the hexadecapole <inline-formula><tex-math version="MathJax"><![CDATA[\(H_{z}^{\alpha}(\boldsymbol{ { r } }_{i},\boldsymbol{ { r } }_{j}) = O_{x'y'}(\boldsymbol{ { r } }_{i})O_{x'^{2} - y'^{2 } }(\boldsymbol{ { r } }_{j}) + O_{x'^{2} - y'^{2 } }(\boldsymbol{ { r } }_{i})O_{x'y'}(\boldsymbol{ { r } }_{j})\)]]></tex-math></inline-formula>of the bound two-electron state coupled to the rotation ω<italic><sub>xy</sub></italic>. 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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  • Development of ultrasonic measurement mothod for multipolar ordered sysytems and two demensional electrons systems in high fields and low temperatures

    S. Nakamura, M. Akatsu, R. Kurihara, Y. Nemoto, T. Nojima, S. Awaji

    High Field Laboratory for Superconductiong Materials, Institute for Materials Reseach, Tohoku University, 2014 Annual Report   1 ( 1 )   113 - 116   2015.7

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

    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 )   100402(R)   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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  • 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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    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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  • 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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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Electrochemical Society Inc.  

    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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  • Hybridization-driven orthorhombic lattice instability in URu <inf>2</inf>Si<inf>2</inf>

    T. Yanagisawa, S. Mombetsu, H. Hidaka, H. Amitsuka, M. Akatsu, S. Yasin, S. Zherlitsyn, J. Wosnitza, K. Huang, M. Janoschek, M. B. Maple

    Physical Review B - Condensed Matter and Materials Physics   88 ( 19 )   2013.11

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    We have measured the elastic constant (C11-C12)/2 in URu2Si2 by means of high-frequency ultrasonic measurements in pulsed magnetic fields H [001] up to 61.8 T in a wide temperature range from 1.5 to 116 K. We found a reduction of (C11-C12)/2 that appears only in the temperature and magnetic field region in which URu 2Si2 exhibits a heavy-electron state and hidden order. This change in (C11-C12)/2 appears to be a response of the 5f electrons to an orthorhombic and volume conservative strain field εxx-εyy with Γ3 symmetry. This lattice instability is likely related to a symmetry-breaking band instability that arises due to the hybridization of the localized f electrons with the conduction electrons and is probably linked to the hidden-order parameter of this compound. © 2013 American Physical Society.

    DOI: 10.1103/PhysRevB.88.195150

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  • Low-Temperature Softening Due to Vacancy Orbital with Gamma(8) Quartet Ground State in Boron-Doped Floating Zone Silicon Reviewed

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

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   82 ( 8 )   084604 - 084604   2013.8

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    Publishing type:Research paper (scientific journal)   Publisher:Physical Society of Japan  

    DOI: 10.7566/JPSJ.82.084604

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

    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 effects in tetragonal crystals PrCu2Si2 and DyCu2Si2 Reviewed International journal

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

    JOURNAL OF PHYSICS-CONDENSED MATTER   25 ( 29 )   296002 - 296002   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 C44 of PrCu2Si2 exhibits pronounced softening below 70 K down to a Néel temperature TN = 20 K, which is described in terms of a quadrupole susceptibility for a Γ5 doublet ground state and a Γ3 singlet first excited state located at 15.6 K in the crystalline electric field scheme. The C44 and C66 of DyCu2Si2 also show softening below 70 K down to TN1 = 9.7 K. A low-lying pseudo-sextet state consisting of three Kramers doublets of Γ6⊕2Γ7 brings about softening of C44 and C66 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

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

    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.

    DOI: 10.1103/PhysRevB.87.205106

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

    A. Sanada, Y. Amou, R. Watanuki, K. Suzuki, I. Yamamoto, H. Mitamura, T. Sakakibara, M. Akatsu, Y. Nemoto, T. Goto

    Journal of the Physical Society of Japan   82 ( 4 )   044713 - 044713-7   2013.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Physical Society of Japan  

    36.2Kと5.4 Kで2つの磁気転移を示すTbCoGa5について磁化率と比熱を測定した.その結果,Tbイオンの磁気モーメントのc軸成分とab面成分が独立して反強磁性的オーダーをしていることをつきとめた.単結晶を育成し,比熱,電気抵抗率,磁化および弾性定数を測定し磁気構造を論じた。

    DOI: 10.7566/JPSJ.82.044713

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  • Magnetic phase diagram of clathrate compound Ce3Pd20Si6 with quadrupolar ordering Reviewed

    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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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    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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  • Γ3-type Lattice Instability and the Hidden Order of URu2Si2 Reviewed International coauthorship International journal

    Tatsuya Yanagisawa, Shota Mombetsu, Hiroyuki Hidaka, Hiroshi Amitsuka, Mitsuhiro Akatsu, Shadi Yasin, Sergei Zherlitsyn, Jochen Wosnitza, Kevin Huang, M. Brian Maple

    J. Phys. Soc. Jpn. 82 (2012) 013601   82 ( 1 )   2013.1

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    We have performed ultrasonic measurements on single-crystalline URu2Si2 with
    pulsed magnetic fields, in order to check for possible lattice instabilities
    due to the hybridized state and the hidden-order state of this compound. The
    elastic constant (C11-C12)/2, which is associated with a response to the
    {\Gamma}3-type symmetry-breaking (orthorhombic) strain field, shows a
    three-step increase at H > 35 T for H || c at low temperatures, where
    successive meta-magnetic transitions are observed in the magnetization. We
    discovered a new fact that the absolute change of the softening of (C11-C12)/2
    in the temperature dependence is quantitatively recovered at the suppression of
    hybridized-electronic state and the hidden order in high-magnetic field for H
    \perp c associated with the successive transitions. The present results suggest
    that the {\Gamma}3-type lattice instability, is related to both the emergence
    of the hybridized electronic state and the hidden-order parameter of URu2Si2.
    On the other hand, magnetic fields H || [100] and [110] enhance the softening
    of (C11-C12)/2 in the hidden order phase, while no step-like anomaly is
    observed up to 68.7 T. We discuss the limitation of the localized-electron
    picture for describing these features of URu2Si2 by examination of a
    crystalline electric field model in terms of mean-field theory.

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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.

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  • Dissipation in Non-Kramers Doublet of PrMg3 Reviewed

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

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81 ( 2 )   023710 - 023710   2012.2

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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.

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  • Specific heat of Ce3Pd20Si6 single crystal in magnetic fields Reviewed

    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'.

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

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

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 9 )   93601 - 093601-4   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 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 )   094601 - 094601   2011.8

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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.

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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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  • Quadrupole Effects of Layered Iron Pnictide Superconductor Ba(Fe_0.9_Co_0.1_)_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 )   073702-1 - 073702-4   2011.4

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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) -&gt; Gamma(5) (1.44 meV) -&gt; Gamma(4) (4.46 meV) -&gt; Gamma(1) (10.7 meV) at the (8c) site and Gamma(5) -&gt; Gamma(3) (0.70 meV) -&gt; Gamma(4) (10.8 meV) -&gt; 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 International journal

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

    J Phys Soc Jpn   80 ( 4 )   43601 - 043601-4   2011.4

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    Elastic properties of the filled skutterudite compound SmOs$_4$Sb$_{12}$ have
    been investigated by ultrasonic measurements. The elastic constant
    $C_{11}(\omega)$ shows two ultrasonic dispersions at $\sim$15 K and $\sim$53 K
    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 $E_2$ = 105 K and $E_1$ = 409 K,
    respectively. The latter, $E_1$, is the highest value reported so far in the
    Sb-based filled skutterudites. The presence of magnetically robust ultrasonic
    dispersions in SmOs$_4$Sb$_{12}$ 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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  • 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   63 - 72   2010.12

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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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  • 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 &lt; 100 &gt;, &lt; 110 &gt;, and &lt; 111 &gt; 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

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

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   79 ( 7 )   74712 - 074712-6   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 ${\sim}0.5$ K due to a phase-II ordering from the paramagnetic state (phase-I). The latter critical temperature $T_{\text{I--II } }$ is found to be strongly enhanced in magnetic fields $B$, depending on the field direction, and $T_{\text{I--II } }(B)$ 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 ${\sim}0.63$ 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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  • 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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  • Successive Magnetic Orderings of Rectangular Components Caused by Conservation of Paraquadrupolar State in Magnetically Ordered Phase in TbCoGa5 Reviewed

    Naoyuki Sanada, Ryuta Watanuki, Kazuya Suzuki, Mitsuhiro Akatsu, Toshiro Sakakibara

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   78 ( 7 )   2009.7

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    We grew single crystals of TbCoGa5 and measured their magnetic susceptibility, specific heat, and elastic constants. The result of the magnetic susceptibility measurement suggests that the c- and ab-components of the magnetic moments of Tb3+ ions order independently at T-N1 = 36.2 K and T-N2 = 5.4 K, respectively. The magnetic entropy change indicates that the degeneracy of internal degrees of freedom is not fully lifted in the intermediate phase. In addition, the degeneracy of electric-quadrupolar (orbital) degrees of freedom exists in spite of the formation of magnetic order because the elastic constants show softening in the intermediate phase. It is considered that the magnetic ordering of the ab-component is suppressed by the existence of the degeneracy of quadrupolar degrees of freedom in TbCoGa5.

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  • Quadrupole ordering in clathrate compound Ce<inf>3</inf>Pd<inf>20</inf>Si<inf>6</inf> Reviewed International journal

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

    Journal of the Physical Society of Japan   78 ( 2 )   24716 - 024716-9   2009.2

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    Low-temperature elastic properties of the clathrate compound Ce 3 Pd 20 Si 6 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 a Γ 8 quartet ground sate with an orbital degeneracy for 8c site of a 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 CeB 6 with the Γ 8 ground sate. The order paramater of the phase III may be characterized by either magnetic dipole or magnetic octupole. The Γ 7 ground state at 4a site may fall into a singlet screened by conduction electrons at low temperatures without long-range magnetic ordering. ©2009 The Physical Society of Japan.

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  • Quadrupole Ordering in Clathrate Compound Ce_3Pd_<20>Si_6(Condensed matter: electronic structure and electrical, magnetic, and optical properties) Reviewed

    GOTO Terutaka, WATANABE Tomoyuki, TSUDUKU Seiji, KOBAYASHI Haruki, NEMOTO Yuichi, YANAGISAWA Tatsuya, AKATSU Mitsuhiro, ANO Genki, SUZUKI Osamu, TAKEDA Naoya, DONNI Andreas, KITAZAWA Hideaki

    Journal of the Physical Society of Japan   78 ( 2 )   "024716 - 1"-"024716-9"   2009.2

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    Low-temperature elastic properties of the clathrate compound Ce_3Pd_&lt;20&gt;Si_6 were investigated using ultrasonic measurements. Pronounced softening of elastic constants (C_&lt;11&gt;-C_&lt;12&gt;)/2 and C_&lt;44&gt; with decreasing temperature indicates a precursor of electric quadrupole ordering due to a Γ_8 quartet ground sate with an orbital degeneracy for 8c site of a Ce ion. A minimum of (C_&lt;11&gt;-C_&lt;12&gt;)/2 at T_C=170mK 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 dep...

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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   2009.1

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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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  • Successive component-separated magnetic transition in TbCoGa5 Reviewed

    Naoyuki Sanada, Takatoshi Muneoka, Ryuta Watanuki, Kazuya Suzuki, Mitsuhiro Akatsu, Toshiro Sakakibara

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

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    We grew single crystals of TbCoGa5 and measured the magnetic susceptibility, magnetization curves, specific heat and ultrasonic properties. The results of the magnetic susceptibility and specific heat measurements suggest that TbCoGa5 shows successive component-separated magnetic transition and the degeneracy of quadrupolar degrees of freedom is not fully lifted in intermediate phase. The softening of the elastic constant C-44 indicates that the degeneracy of electric-quadrupolar (orbital) degrees of freedom exists in spite of the formation of magnetic order. We have considered that the degeneracy of quadrupolar degrees of freedom is important for the occurrence of successive component-separated magnetic transition.

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

    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   042002_1 - 042002_4   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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  • 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.

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  • He-3 cryostat for NWMS Reviewed

    Mitsuhiro Akatsu, Naoki Shirakawa

    LOW TEMPERATURE PHYSICS, PTS A AND B   850   1645 - +   2006

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    We have developed a He-3 cryostat for the MPMS (Quantum Design) to measure magnetization with ease down to similar to 0.4 K. The MPMS is a SQUID-based magnetometer and is very popular because of its high sensitivity and ease of use. However, the measurements below 1.8 K are impossible with the MPMS, while the necessity to reach lower temperature is increasing due to recent progress in solid state physics and chemistry. Our He-3 cryostat consists of an insert and a 3He gas handling system. The insert is composed of non-magnetic materials. In particular, the materials near the sample are titanium, copper, phosphor bronze, and plastic for highly sensitive magnetization measurements. By electronically controlling the valves and pumps in the He-3 gas handling system, the cryostat enables the MPMS to perform automatic magnetization measurements below 1.8 K. The base temperature of the cryostat which uses a sorption pump, is 420 mK. The continuous operating time at similar to 500 mK is more than 8 hours.

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  • Quadrupole fluctuation and off-center rattling motion in heavy fermion superconductor PrOs4Sb12 Reviewed International journal

    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.

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  • Antiferro-quadrupole ordering of CexLa1-xB6 under high magnetic fields Reviewed

    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.

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  • Tunneling and rattling of clathrate crystals Ce3Pd20Ge6 and La3Pd20Ge6 Reviewed International journal

    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.

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  • A heterometal single-molecule magnet of [Mn<SUP>III</SUP><SUB>2</SUB>Ni<SUP>II</SUP><SUB>2</SUB>Cl<SUB>2</SUB>(salpa)<SUB>2</SUB>] Reviewed

    OSHIO,Hiroki, NIHEI,Masayuki, KOIZUMI,Satoshi, SHIGA,Takuya, NOJIRI,Hiroyuki, NAKANO,Motohiro, SHIRAKAWA,Naoki, AKATSU,Mitsuhiro

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   127 ( 13 )   4568 - 4569   2005.4

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  • 25pXN-1 Syntheses and Magnetic properties of Heteronuclear Single Molecule Magnets

    Oshio,Hiroki, Nihei,Masayuki, Shiga,Takuya, Koizumi,Satoshi, Nakano,Motohiro, Nojiri,Hiroyuki, Shirakawa,Naoki, Akatsu,Mituhiro

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   459   2005.3

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  • Elastic properties and magnetic phase diagrams of dense Kondo compound Ce0.75La0.2B6 Reviewed

    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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  • Elastic constant in magnetic fields and singlet-triplet state of heavy fermion superconductor PrOS4Sb12 Reviewed International journal

    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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  • Magnetic anisotropy of the antiferroquadrupole phase in Ce0.50La0.50B6 Reviewed

    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 Reviewed International journal

    Terutaka Goto, Yuichi Nemoto, Takashi Yamaguchi, Mitsuhiro Akatsu, Tatsuya Yanagisawa, Osamu Suzuki, Hideaki Kitazawa

    PHYSICAL REVIEW B - Condensed Matter and Materials Physics   70   184126   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 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.

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  • Quadrupolar effect and rattling motion in heavy fermion superconductor PrOs_4Sb_{12} Reviewed International journal

    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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  • 28pPSA-56 Ultrasonic absorption of rattling in clathrate compound La_3Pd_<20>Ge_6 International journal

    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 ( 1 )   1 - 5   2004.3

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    We present tunneling and rattling motions of an off-center guest atom in cage<br />
    referring to a clathrate crystal La_3Pd_{20}Ge_6. The elastic constant C_{44}<br />
    of La_3Pd_{20}Ge_6 shows a Debye-type dispersion around 20 K obeying a<br />
    relaxation time tau = tau_0exp(E/k_{B}T) with an attempt time tau_0 =<br />
    2.0*10^{-12} sec and an activation energy E = 197 K. At low temperatures below<br />
    3 K down to 20 mK, the C_{44} shows a softening of C_{44} =<br />
    C_{44}^0(T-T_C^0)/(T-Theta) with T_C^0 = -337.970 mK and Theta = -338.044 mK.<br />
    These facts are attributed to two different types of the off-center motions<br />
    with Ga...

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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.

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  • Ferroquadrupole ordering and Gamma_5 rattling motion in clathrate compound Ce_3Pd_20Ge_6 Reviewed International journal

    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 Reviewed

    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.

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  • Thermal expansion and ultrasonic measurements of ferroquadrupole ordering in HoB<SUB>6</SUB> Reviewed

    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 Ce<SUB>x</SUB>La<SUB>1-x</SUB>B<SUB>6</SUB> (x=0.75 and 0.70) Reviewed

    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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  • Trigonal lattice distortion and ferro-quadrupole ordering in phase IV of CexLa1-xB6 (x=0.75 and 0.70) Reviewed

    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.

    DOI: 10.1143/JPSJ.72.205

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  • Low-temperature behavior of the elastic constant C<SUB>44</SUB> in Ce<SUB>x</SUB>La<SUB>1-x</SUB>B<SUB>6</SUB> Reviewed

    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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  • 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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MISC

  • 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 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

  • 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

  • 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

  • Pressure dependences of longitudinal elastic constants 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)   76 ( 1 )   2021

  • High-E resolution neutron scattering on YIG under ultrasound irradiation

    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

  • 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

  • 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

  • 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

  • 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>

    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)   76 ( 2 )   2021

  • Quantum Critical Phenomena of Iron Pnictide Superconductor Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub> Induced by Multipole Fluctuation

    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)   76 ( 1 )   2021

  • 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

  • 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

  • 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 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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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  • 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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  • 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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  • 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

  • 極低温・高磁場環境下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・磁歪測定

    小野拓哉, 生方憲二郎, 古田真也, 関口祐太, 岩上欧史, 阿部聡, 松本宏一, 阿野元貴, 赤津光洋, 三本啓輔, 根元祐一, 後藤輝孝, 武田真也, 北澤英明

    日本物理学会講演概要集(CD-ROM)   73 ( 1 )   2018

  • 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 )   2018

  • 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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  • 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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  • 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

    赤津光洋, 栗原綾佑, 三本啓輔, 根本祐一, 根本祐一, 後藤輝孝, 後藤輝孝, YASIN Shadi, ZHERLITSYN Sergei, WOSNITZA Joachim, 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‐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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  • 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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  • 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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  • 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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  • 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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  • 静水圧下超音波計測によるシリコン原子空孔軌道の研究

    三原佳祐, 坂井隼人, 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)   72 ( 1 )   ROMBUNNO.18pS‐PS‐30   2017.3

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  • 超音波計測による鉄ヒ素超伝導体の構造相転移における四極子と超伝導における十六極子の研究

    三本啓輔, 高野恵理, 栗原綾佑, 赤津光洋, 根本祐一, 根本祐一, 後藤輝孝, 後藤輝孝, 豊田真幸, 小林義明, 小林義明, 伊藤正行, 伊藤正行, 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‐15   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CeAl<sub>2</sub>の低温物性の研究

    石川諒, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 佐瀬芳行, 広瀬雄介, 摂待力生

    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   ROMBUNNO.18aS‐PS‐19   2017.3

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  • Spin wave of Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> and the ultrasound \&amp; heat-flux effect

    Shamoto S, Nemoto Y, Maekawa S, Matsuura M, Akatsu M, Ito T. U, Mori M, Kajimoto R, Nakamura M, Kawamura S, Shibata K

    Meeting Abstracts of the Physical Society of Japan   72 ( 0 )   1258 - 1258   2017

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    &lt;p&gt;スピンゼーベック効果を決める因子の一つとしてスピン波の状態密度がある。これはq積分した動的磁化率$\chi&amp;quot;(E)$に比例することから、中性子非弾性散乱(INS)で求めることができる。我々はY_3_Fe_5_O_12_のスピン波の動的磁化率をJ-PARC/MLFのINS装置を用いて、吸収補正を含め絶対値で求めてきた。当日は超音波や熱流の効果についても併せて報告したい。&lt;/p&gt;

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  • Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>のマグノン状態密度と分散

    社本真一, 伊藤孝, 大西弘明, 森道康, 松浦直人, 赤津光洋, 中村充孝, 稲村泰弘, 山内宏樹, 中尾朗子, 大原高志, 茂吉武人, 宗像孝司, 樹神克明, 河村聖子, 根本祐一, 柴田薫, 前川禎通

    日本中性子科学会年会講演概要集   17th   54   2017

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  • 超音波によるカゴ状化合物PrPt<sub>2</sub>Cd<sub>20</sub>の弾性定数測定 II

    藤原万里子, 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

    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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    DOI: 10.11316/jpsgaiyo.71.2.0_2109

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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

    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)   71 ( 2 )   ROMBUNNO.13pJA‐16 - 1779   2016.9

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    DOI: 10.11316/jpsgaiyo.71.2.0_1779

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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

    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)   71 ( 2 )   ROMBUNNO.14aPS‐61 - 1897   2016.9

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    DOI: 10.11316/jpsgaiyo.71.2.0_1897

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  • 横波超音波による十六極子‐回転相互作用の研究

    後藤輝孝, 後藤輝孝, 栗原綾佑, 三本啓輔, 赤津光洋, 根本祐一, 根本祐一, 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)   71 ( 2 )   ROMBUNNO.13pJA‐15 - 1778   2016.9

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    DOI: 10.11316/jpsgaiyo.71.2.0_1778

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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

    関口祐太, 岩上欧史, 峯岸光如, 上野敬介, 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)   71 ( 2 )   ROMBUNNO.15aPS‐45 - 2111   2016.9

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    DOI: 10.11316/jpsgaiyo.71.2.0_2111

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  • 静水圧下超音波による圧力誘起超伝導体CeRhIn<sub>5</sub>の研究

    赤津光洋, 伊藤基樹, 三本啓輔, 根本祐一, 後藤輝孝, 広瀬雄介, 摂待力生

    日本物理学会講演概要集(CD-ROM)   71 ( 1 )   ROMBUNNO.20PPSB‐3   2016.3

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  • 超低温におけるカゴ状化合物R<sub>3</sub>Pd<sub>20</sub>Ge<sub>6</sub>(R=La,Pr)の熱膨張測定

    岩上欧史, 矢尾優丞, 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

    日本物理学会講演概要集(CD-ROM)   71 ( 1 )   ROMBUNNO.22APS‐9 - 2111   2016.3

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    DOI: 10.11316/jpsgaiyo.71.2.0_2111

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  • 超音波によるカゴ状化合物PrPt<sub>2</sub>Cd<sub>20</sub>の弾性定数測定

    藤原万里子, 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

    日本物理学会講演概要集(CD-ROM)   71 ( 1 )   ROMBUNNO.22APS‐6   2016.3

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  • 超音波によるカゴ状物質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)   71 ( 1 )   ROMBUNNO.19PBL‐10   2016.3

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  • 22aAU-4 Elastic Softening due to Quadrupole-Strain Interaction in Ba_2CoGe_2O_7

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

    Meeting Abstracts of the Physical Society of Japan   71 ( 0 )   1281 - 1281   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_1281

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  • 19pBL-10 Ultrasonic study of caged compound PrPt_2Cd_<20>

    Nemoto Y, Fujiwara M, Akatsu M, Mitsumoto K, Goto T, Doto H, Hirose Y, Settai R

    Meeting Abstracts of the Physical Society of Japan   71 ( 0 )   2014 - 2014   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2014

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  • Low energy spin wave of Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>

    Shamoto S, Matsuura M, Akatsu M, Ito T. U, Mori M, Kajimoto R, Shibata K, Nemoto Y, Maekawa S

    Meeting Abstracts of the Physical Society of Japan   71 ( 0 )   933 - 933   2016

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    &lt;p&gt;Y3Fe5O12(YIG)はスピンゼーベック効果などで他の磁性体に比べてその性能に優れており、このことは低エネルギーのスピン波に何らかの特徴があるものと思われる。一方でYIGは古くから知られる磁性体であり、光アイソレータとして実用化され、中性子散乱でもよく調べられているが、2009年に電気磁気効果が見つかるなどまだよくわかっていない点がある。特に低エネルギーのスピン波についてはこれまで報告がなかったので、今回、J-PARC/MLFの高分解能中性子非弾性散乱装置DNAなどを用いて、0.02meV付近から100meVまでのスピン波を測定したので、その結果について報告する。&lt;/p&gt;

    DOI: 10.11316/jpsgaiyo.71.2.0_933

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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 II

    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

    日本物理学会北陸支部定例学術講演会講演予稿集   2016   18   2016

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  • カゴ状の結晶構造を持つ新奇なウラン化合物の単結晶育成と電子状態の研究

    広瀬雄介, 摂待力生, 河野琢馬, 角田竜馬, 今井渉, 鈴木佳孝, 高橋耕平, 平原琢也, 赤津光洋, 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)   33   131‐132   2016

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  • 空蝉によるYIGスピン波の絶対値強度の見積もり

    社本真一, 伊藤孝, 森道康, 前川禎通, 梶本亮一, 稲村泰弘, 中村充孝, 河村聖子, 柴田薫, 松浦直人, 赤津光洋, 根本祐一

    日本中性子科学会年会講演概要集   16th   60   2016

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  • 22aPS-6 Elastic constants of cage-structured compound PrPt_2Cd_<20>

    Fujiwara M, Akatsu M, Mitsumoto K, Nemoto Y, Goto T, Doto H, Hirose Y, Settai R

    Meeting Abstracts of the Physical Society of Japan   71 ( 0 )   2400 - 2400   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2400

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  • 22aPS-9 Thermal Expansion Measurements in Clathrate Compound R_3Pd_<20>Ge_6 (R = La, Pr)at millikelvin temperatures

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

    Meeting Abstracts of the Physical Society of Japan   71 ( 0 )   2403 - 2403   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2403

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  • 超音波を用いた圧力誘起超伝導体CeRhIn<sub>5</sub>の静水圧下弾性定数測定

    伊藤基樹, 三本啓輔, 赤津光洋, 根本祐一, 後藤輝孝, 広瀬雄介, 摂待力生

    日本物理学会講演概要集(CD-ROM)   70 ( 2 )   ROMBUNNO.17APS-10   2015.9

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

    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

    日本物理学会講演概要集(CD-ROM)   70 ( 2 )   ROMBUNNO.17APS-52   2015.9

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  • 圧力下超音波実験による重い電子YbCo<sub>2</sub>Zn<sub>20</sub>の研究

    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(CD-ROM)   70 ( 1 )   ROMBUNNO.22APS-59   2015.3

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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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  • 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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  • 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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  • 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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  • 16aPS-122 Precision Ultrasonic Measurement System Using a 12-bit DSO

    Akatsu M, Kurihara R, Nemoto Y, Goto T, Nakamura S, Zherlitsyn S

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

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    DOI: 10.11316/jpsgaiyo.70.2.0_796

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

    摂待力生, 広瀬雄介, 太田俊平, 倉橋秀平, 都丸駿, 土塔寛, 佐瀬芳行, 藤原万里子, 赤津光洋, 根本祐一, 本多史憲, 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)   2014   93 - 94   2015

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

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

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   359 - 359   2014.8

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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 ( 2 )   375 - 375   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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  • 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   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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  • 希土類カゴ状化合物RRu<sub>2</sub>Zn<sub>20</sub>(R=La,Sm)のラットリングの研究

    高橋美樹, 赤津光洋, 三本啓輔, 根本祐一, 後藤輝孝, 笹原拓也, 中野智仁, 武田直也, 石井勲

    日本物理学会講演概要集   69 ( 1 )   610   2014.3

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

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

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   613 - 613   2014.3

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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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • URu<sub>2</sub>Si<sub>2</sub>の強磁場弾性応答 II

    柳澤達也, 門別翔太, 日高宏之, 網塚浩, 赤津光洋, YASIN Shadi, ZHERLITSYN Sergei, WOSNITZA Jochen, HUANG Kevin, JANOSCHEK M., JANOSCHEK M., MAPLE M. Brian

    日本物理学会講演概要集   69 ( 1 )   2014

  • 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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  • 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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  • 26aXA-4 Elastic Responses of URu_2Si_2 under High-Magnetic Fields

    Yanagisawa T, Mombetsu S, Hidaka H, Amitsuka H, Akatsu M, Yasin Shadi, Zherlitsyn Sergei, Wosnitza Jochen, Huang Kevin, Maple M. Brian

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   569 - 569   2013.3

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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 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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  • 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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  • 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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  • 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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  • 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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  • 18pGA-8 Ultrasonic Measurements of URu_2Si_2 under Pulsed-Magnetic Fields

    Yanagisawa T., Mombetsu S., Hidaka H., Amitsuka H., Akatsu M., Yasin S., Zherlitsyn S., Wosnitza J., Huang K., Maple M. B.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   466 - 466   2012.8

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

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

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   649 - 649   2012.3

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

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

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   559 - 559   2012.3

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

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

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   663 - 663   2012.3

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

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

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   493 - 493   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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 単結晶R<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の磁場中比熱 III

    小野宏基, 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   66 ( 2 )   650   2011.8

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  • 23aPS-84 Acoustic de Haas-van Alphen Effect of SmOs_4Sb_<12>

    Yanagisawa T, Monbetsu S, Hidaka H, Amitsuka H, Akatsu M, Araki K, Nemoto Y, Goto T, Ho Pei-Chun, Baumbach Ryan E, Maple M. Brian

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   596 - 596   2011.8

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

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   649 - 649   2011.8

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  • 24pGC-1 Antiferro-quadrupolar ordering in PrIr_2Zn_<20>

    Ishii I., Muneshige H., Suetomi Y., Fujita T. K., Onimaru T., Matsumoto K. T., Takabatake T., Araki K., Akatsu M., Nemoto Y., Goto T., Suzuki T.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   648 - 648   2011.8

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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 ( 2 )   650 - 650   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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  • 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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  • 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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  • 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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  • 単結晶R<sub>3</sub>Pd<sub>20</sub>Si<sub>6</sub>の磁場中比熱 II

    小野宏基, 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   66 ( 1 )   540   2011.3

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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 ( 1 )   542 - 542   2011.3

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

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   679 - 679   2011.3

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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 ( 1 )   542 - 542   2011.3

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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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  • 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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  • 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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  • 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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    DOI: 10.1143/JPSJ.80.094601

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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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  • 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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  • 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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  • 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-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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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 )   2011

  • 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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  • 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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  • 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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  • 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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  • 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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  • 25aWJ-7 Ultrasonic Dispersions of Filted-Skutterudite SmOs_4Sb_<12>

    Yanagisawa T, Saito H, Hidaka H, Amitsuka H, Akatsu M, Araki K, Takahashi N, Nemoto Y, Goto T, Ho Pei-Chun, Baumbach Ryan E, Maple M. Brian

    Meeting abstracts of the Physical Society of Japan   65 ( 2 )   585 - 585   2010.8

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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 ( 2 )   522 - 522   2010.8

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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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  • 21aPS-75 Study of Quadrupole Effect in Tetragonal RCu_2Si_2(R=Pr,Dy)

    Goto S, Mitsumoto K, Araki K, Akatsu M, Nemoto Y, Goto T, DUNG Nguyen Duc, Matsuda T. D, Haga Y, Ota Y, Sugiyama K, Settai R, Onuki Y

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   618 - 618   2010.3

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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 ( 1 )   624 - 624   2010.3

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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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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 )   2010

  • 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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  • 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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  • 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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  • 26pTJ-13 Study of quadrupole effect in RCu_2Si_2 using low-temperature ultrasonic measurements

    Mitsumoto K, Goto S, Araki K, Akatsu M, Nemoto Y, Goto T, Dung Nguyen Duc, Matsuda T, Haga Y, Ota Y, Sugiyama K, Settai R, Onuki Y

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   524 - 524   2009.8

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  • 25aPS-66 Ultrasonic Investigation of the Quadrupole Effect in Tetragonal PrCu_2Si_2

    Goto S, Mitsumoto K, Araki K, Akatsu M, Nemoto i. Y, Goto T, DUNG Nguyen Duc, Matsuda T. D, Haga Y, Ota Y, Sugiyama K, Settai R, Onuki Y

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   431 - 431   2009.8

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  • 26aRL-10 Ratting and Tunneling in The Filled Skutterudite (Pr_<1-x>La_x)Os_4Sb_<12>

    Nemoto Y., Toyada T., Ano G., Araki K., Akatsu M., Ishii I., Takeda N., Ochiai A., Sugawara H., Sato H., Goto T.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   475 - 475   2009.8

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  • 25aPS-84 Ultrasonic Study of Multipole Ordering in DyPd_3S_4

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

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   435 - 435   2009.8

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  • 25aPS-48 Magnetization of Ce_3Pd_<20>Si_6 at low temperatures II

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

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   427 - 427   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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  • 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 ( 1 )   532 - 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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  • 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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  • 27aPS-80 Ultrasonic Investigation of the Quadrupole Effect in Tetragonal PrCu_2Si_2

    Goto S, Araki K, Akatsu M, Ishii I, Nemoto Y, Goto T, DUNG Nguyen Duc, Matsuda T. D, Haga Y, Ota Y, Sugiyama K, Onuki Y

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   549 - 549   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., Ano G., Tachikawa Y., Ishii I., Akatsu M., Nemoto Y., Goto T., Takeda N., Donni Andreas, Kitazawa H.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   534 - 534   2009.3

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  • 28aTD-11 Magnetic structure and elastic constants of TbCoGa_5

    Sanada Naoyuki, Watanuki Ryuta, Suzuki Kazuya, Akatsu Mitsuhiro, Sakakibara Toshiro, Duijn Joost van, Andre Gilles

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   590 - 590   2009.3

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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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  • 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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  • 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-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-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-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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  • 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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  • 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 ( 2 )   496 - 496   2008.8

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    DOI: 10.1143/JPSJ.77.074607

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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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  • 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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  • 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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  • 21aPS-53 Magnetization of Ce_3Pd_20Si_6 at low temperatures

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

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   505 - 505   2008.8

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  • 21aPS-62 Successive component-separated magnetic transition in TbCoGa_5

    Sanada Naoyuki, Muneoka Takatoshi, Watanuki Ryuta, Suzuki Kazuya, Akatsu Mitsuhiro, Sakakibara Toshiro

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   507 - 507   2008.8

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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., Donni Andreas, Mihalik Matus, Yanagimachi O., Matsuda M., Kaneko K., Metoki N., Kakurai K., Tsuduku S., Ano G., Ishii I., Akatsu M., Nemoto Y., Goto T.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   528 - 528   2008.8

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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 ( 1 )   542 - 542   2008.2

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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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  • 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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  • 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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  • 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-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-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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  • 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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  • 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 ( 2 )   566 - 566   2007.8

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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 ( 1 )   610 - 610   2006.3

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  • 27pPSB-55 ^3He Cryostat for SQUID Magnetometer

    Akatsu Mitsuhiro, Shirakawa Naoki

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   463 - 463   2006.3

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  • 19pXD-7 Heavy-fermion behavior in new Ce compounds CeT_2Si(T=Rh and Ir)

    Muro Y., Motoya K., Akatsu M., Shirakawa N.

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   383 - 383   2005.8

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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 ( 2 )   413 - 413   2005.8

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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.

    DOI: 10.1016/j.physb.2005.01.275

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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 ( 1 )   542 - 542   2005.3

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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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  • 静磁場及びパルス磁場によるMn(II/III)7核単分子磁石の磁気緩和挙動

    小泉智史, 二瓶雅之, 中野元裕, 野尻浩之, 大島勇吾, 白川直樹, 赤津光洋, 大塩寛紀

    電子スピンサイエンス学会年会講演要旨集   44th   2005

  • 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 ( 1 )   610 - 610   2004.3

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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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  • 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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  • 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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  • Quadrupolar sysceptibility and superconductivity of PrOs_4Sb_<12>

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

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   499 - 499   2003.8

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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 ( 2 )   490 - 490   2003.8

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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 ( 1 )   556 - 556   2003.3

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  • 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.

    DOI: 10.1143/JPSJS.71S.112

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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 ( 2 )   513 - 513   2002.8

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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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  • 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 ( 2 )   400 - 400   2001.9

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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 ( 2 )   472 - 472   2001.9

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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 ( 1 )   494 - 494   2001.3

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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 ( 2 )   459 - 459   2000.9

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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 ( 1 )   444 - 444   2000.3

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Industrial property rights

  • METHOD AND DEVICE FOR EVALUATING ATOMIC VACANCY IN SILICON WAFER SURFACE LAYER

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    Applicant:Niigata University

    Application no:特願2013-232352  Date applied:2013.11

    Announcement no:特開2014-168042  Date announced:2014.9

    Patent/Registration no:特許第6291797号  Date registered:2018.2 

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  • METHOD FOR DETERMINING ABSOLUTE VALUE OF ATOMIC VACANCY CONCENTRATION IN SILICON WAFER

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    Applicant:Niigata University

    Application no:特願2013-232353  Date applied:2013.11

    Announcement no:特開2014-168043  Date announced:2014.9

    Patent/Registration no:特許第6244833号  Date registered:2017.11 

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Research Projects

  • 超音波によるパワーデバイス用リン添加シリコン結晶の原子空孔の研究

    2021.7 - 2022.3

    内田エネルギー科学振興財団  試験研究費助成 

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  • 静水圧下超音波計測による量子臨界点近傍に現れる超伝導の研究

    2020.7 - 2021.3

    内田エネルギー科学振興財団  試験研究費助成 

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  • Elucidation of mechanism of superconductivity in multiband superconductors by ultrasonic measurements under hydrostatic pressures

    Grant number:17K05538  2017.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

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    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

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  • Ultrasonic study of quadrupole-strain coupling of silicon vacancy

    Grant number:15K17704  2015.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)  Grant-in-Aid for Young Scientists (B)

    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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  • Development of surface acoustic wave devices and its application to strongly correlated electron systems

    Grant number:15K13518  2015.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    NEMOTO Yuichi, AKATSU Mitsuhiro, MITSUMOTO Keisuke, KANETA Hiroshi, GOTO Terutaka, KASHIMA Kazuhiko

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    Grant amount:\3770000 ( Direct Cost: \2900000 、 Indirect Cost:\870000 )

    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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  • マルチバンド超伝導体の四極子揺らぎの解明

    2014.7 - 2015.3

    内田エネルギー科学振興財団  試験研究費助成 

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    Authorship:Principal investigator 

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  • Surface acoustic wave investigation of vacancy orbital in silicon wafer

    Grant number:26247059  2014.6 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

    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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  • Elucidation of electric quadrupole effects in multiband superconductors by ultrasonic measurements

    Grant number:26800184  2014.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)  Grant-in-Aid for Young Scientists (B)

    AKATSU Mitsuhiro

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    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

    We have measured the ultrasonic attenuation coefficients of iron-based superconductors Ba(Fe1-xCox)2As2 and A-15 Superconductor V3Si with multiband structure. Ultrasonic attenuation coefficients show divergent increase with divergent softening of elastic constants toward the structural phase transition. Because this behavior indicates a critical slowing down phenomenon of quadrupole, the structural phase transition is a ferro quadrupole phase transition. On the other hand, Ultrasonic attenuation coefficient only shows divergent increase toward the superconducting transition. We performed analysis and calculation to focus the rotation induced by transverse ultrasound. We clarified that two conduction electrons form a hexadecapole to create a bound state and the critical slowing down occurs, which shows that the fluctuation of the hexadecapole increases divergently.

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  • Study of dissipative quantum state by means of high-frequency ultrasonic devices processed by micromachining

    Grant number:23654116  2011 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    NEMOTO Yuichi, AKATSU Mitsuhiro

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    Grant amount:\3640000 ( Direct Cost: \2800000 、 Indirect Cost:\840000 )

    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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  • Study of rattling and electron-phonon interaction in cage-structured compounds

    Grant number:21340097  2009 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    NEMOTO Yuichi, AKATSU Mitsuhiro

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    Grant amount:\18590000 ( Direct Cost: \14300000 、 Indirect Cost:\4290000 )

    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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  • 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

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    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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  • Strongly correlated quantum phase associated with charge fluctuation

    Grant number:18002008  2006 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research  Grant-in-Aid for Specially Promoted Research

    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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Teaching Experience (researchmap)

  • Primary Seminar in Science

    2022.6

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  • Introduction to Contemporary Physics A,B

    2019.4

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  • Solid State Physics

    2019.4

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  • Laboratory Work of Physics

    2019.4

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  • Solid State Physics Ⅲ

    2018.4

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    Level:Postgraduate  Country:Japan

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  • Basic Practice on Physics a,b

    2017.4

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  • Exercise Class in Physical Mathematics I

    2015.4
    -
    2017.3

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Teaching Experience

  • 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

  • 自然科学基礎実験

    2021
    Institution name:新潟大学

  • 理学スタディ・スキルズ

    2021
    Institution name:新潟大学

  • 現代物理学セミナーB

    2020
    Institution name:新潟大学

  • 物理学実験D

    2020
    Institution name:新潟大学

  • 現代物理学セミナーA

    2020
    Institution name:新潟大学

  • 物理学実験C

    2020
    Institution name:新潟大学

  • 物理学実験A

    2020
    Institution name:新潟大学

  • 物理学実験B

    2020
    Institution name:新潟大学

  • 専門力アクティブ・ラーニング

    2020
    -
    2021
    Institution name:新潟大学

  • 物性物理学

    2019
    Institution name:新潟大学

  • 物理学基礎実習a

    2017
    Institution name:新潟大学

  • 物理学基礎実習b

    2017
    Institution name:新潟大学

  • 理学スタディ・スキルズ

    2017
    -
    2021
    Institution name:新潟大学

  • 物理学演習A

    2017
    Institution name:新潟大学

  • 物性物理学I

    2017
    Institution name:新潟大学

  • 物理数学演習I

    2015
    -
    2016
    Institution name:新潟大学

  • 数理物質科学特定研究Ⅰ(物理学)

    2015
    Institution name:新潟大学

  • コラボレーション演習

    2015
    Institution name:新潟大学

  • 数理物質科学演習Ⅰ(物理学)

    2015
    Institution name:新潟大学

  • 固体物性物理学Ⅲ

    2014
    -
    2020
    Institution name:新潟大学

  • 初等物理学実験

    2014
    -
    2016
    Institution name:新潟大学

  • 物性物理学II

    2014
    -
    2016
    Institution name:新潟大学

  • 物理学基礎実験

    2014
    -
    2015
    Institution name:新潟大学

  • 物理学実験a

    2014
    Institution name:新潟大学

  • 物理学実験b

    2014
    Institution name:新潟大学

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