掲載種別：研究論文（学術雑誌）   出版者・発行元：IOP Publishing  

DOI： 10.1088/1742-6596/969/1/012120

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その他リンク： http://stacks.iop.org/1742-6596/969/i=1/a=012120?key=crossref.8ed79a65286b9349ac7d7d57c9f72027

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.97.054429/fulltext

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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(Fe₁₋<italic>_x</italic>Co<italic>_x</italic>)₂As₂. The attenuation coefficient α_L[110]of the longitudinal ultrasonic wave for (<italic>C</italic>₁₁+ <italic>C</italic>₁₂+ 2<italic>C</italic>₆₆)/2 for <italic>x</italic>= 0.036 reveals the critical slowing down of the relaxation time around the structural transition at <italic>T</italic>_s= 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>_xy</italic>. The attenuation coefficient α₆₆of the transverse ultrasonic wave for <italic>C</italic>₆₆for <italic>x</italic>= 0.071 also exhibits the critical slowing down around the superconducting transition at <italic>T</italic>_SC= 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>_xy</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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記述言語：日本語  

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER PHYSICAL SOC  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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

DOI： 10.7566/JPSJ.83.044603

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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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掲載種別：研究論文（学術雑誌）  

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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掲載種別：研究論文（学術雑誌）  

DOI： 10.7566/JPSJ.82.084604

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER PHYSICAL SOC  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1088/0953-8984/25/29/296002

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PubMed

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掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER PHYSICAL SOC  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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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記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have performed ultrasonic measurements on single-crystalline URu2Si2 with<br />
pulsed magnetic fields, in order to check for possible lattice instabilities<br />
due to the hybridized state and the hidden-order state of this compound. The<br />
elastic constant (C11-C12)/2, which is associated with a response to the<br />
{\Gamma}3-type symmetry-breaking (orthorhombic) strain field, shows a<br />
three-step increase at H &gt; 35 T for H || c at low temperatures, where<br />
successive meta-magnetic transitions are observed in the magnetization. We<br />
discovered a new fact that the absolute change of the softening of (C11-C12)/2...

DOI： 10.7566/JPSJ.82.013601

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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

DOI： 10.1143/JPSJ.81.034710

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掲載種別：研究論文（学術雑誌）  

DOI： 10.1143/JPSJ.81.023710

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：TRANS TECH PUBLICATIONS LTD  

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

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

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IOP PUBLISHING LTD  

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

DOI： 10.1088/1742-6596/391/1/012054

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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.

DOI： 10.1143/JPSJ.80.093601

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1143/JPSJ.80.094601

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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.

DOI： 10.1143/JPSJS.80SA.SA082

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER PHYSICAL SOC  

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

DOI： 10.1103/PhysRevB.84.045110

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1143/JPSJ.80.073702

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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.

DOI： 10.1143/JPSJ.80.044715

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Physical Society of Japan  

Elastic properties of the filled skutterudite compound SmOs4Sb12 have been investigated by ultrasonic measurements. The elastic constant C11(ω) shows two ultrasonic dispersions at ∼15 and ∼53 K for frequencies ω between 33 and 316 MHz, which follow a Debye-type formula with Arrhenius-type temperaturedependent relaxation times and remain unchanged even with applied magnetic fields up to 10 T. The corresponding activation energies were estimated to be E2 = 105 K and E1 = 409 K, respectively. The latter, E1, is the highest value reported thus far in the Sb-based filled skutterudites. The prese...

DOI： 10.1143/JPSJ.80.043601

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IOP PUBLISHING LTD  

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.

DOI： 10.1088/1742-6596/273/1/012002

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IOP PUBLISHING LTD  

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.

DOI： 10.1088/1742-6596/273/1/012133

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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.

DOI： 10.1149/1.3485683

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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.

DOI： 10.1143/JPSJ.79.114707

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記述言語：英語   出版者・発行元：Physical Society of Japan  

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.

DOI： 10.1143/JPSJ.79.074712

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IOP PUBLISHING LTD  

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.

DOI： 10.1088/1742-6596/200/1/012118

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IOP PUBLISHING LTD  

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.

DOI： 10.1088/1742-6596/200/1/012121

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

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.

DOI： 10.1016/j.physb.2009.07.051

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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.

DOI： 10.1143/JPSJ.78.073709

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：一般社団法人日本物理学会  

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.

DOI： 10.1143/JPSJ.78.024716

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：社団法人日本物理学会  

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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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.

DOI： 10.4028/www.scientific.net/SSP.156-158.135

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IOP PUBLISHING LTD  

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.

DOI： 10.1088/1742-6596/150/4/042172

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IOP PUBLISHING LTD  

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.

DOI： 10.1088/1742-6596/150/4/042002

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

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

DOI： 10.1016/j.jmmm.2006.10.126

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：AMER INST PHYSICS  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

We have made ultrasonic measurements on a filled skutterudite PrOs4Sb12 showing a heavy Fermion superconductivity at T-C = 1.85 K. The elastic constants (C-11 - C-12)/2 and C-44 of PrOs4Sb12 exhibit low-temperature softenings below 20 K down to T-C, indicating a quadrupole fluctuation of Pr3+ ion. A minimum of (C-11 - C-12)/2 in magnetic fields along the [1 1 0] direction around 8 T shows a level crossing of one of a excited Gamma(4)((2)) triplet to a ground state Gamma(1) singlet. An ultrasonic dispersion in (C-11 - C-12)/2 around 30 K suggests a thermally activated off-center rattling of Pr ion in a cage of Sb-icosahedron. The observed relaxation time shows the Arrhenius-type temperature dependence tau = tau(0) exp(E/k(B)T) with an attempt time tau(0) = 8.8 x 10(-11) s and an activation energy E = 168 K. The charge fluctuation of the off-center motion and the quadrupole fluctuation of the 4f electron may participate in the formation of the heavy fermion and the superconductivity in PrOs4Sb12. (c) 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2005.01.241

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

We have investigated the magnetic phase diagrams for anti ferro-quadrupole (AFQ) phase II in CexLa1-xB6 by ultrasonic measurements under high magnetic fields up to 30 T by using the hybrid-magnet (Gama) at National Institute for Materials Science in Tsukuba. Ce0.50La0.50B6 reveals that the AFQ phase boundary in applied magnetic fields along the [0 01] direction closes at about 29 T and the boundaries in fields along the [110] and [111] directions are still open even at 30 T. The AFQ phase transition temperature in Ce0.75La0.25B6 shows maximum at about 25 T in H parallel to [001]. These experimental results support the idea that the multipole RKKY-type inter-site interaction of the quadrupoles O-yz, O-zx, O-xy and the field-induced octupole T-xyz play an important role in the highly anisotropic magnetic phase diagram of phase II of CexLa1-xB6 in high magnetic fields. (c) 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2005.01.277

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

We have made ultrasonic measurements on clathrate crystals Ce3Pd20Ge6 and La3Pd20Ge6 with a cage filled by a rare-earth atom. The elastic constants C-44 of both compounds show a marked dependence in ultrasonic frequencies of 10-300 MHz around 10-30 K, which are caused by a thermally activated rattling of the off-center rare-earth ion in the cage over the potential hill. At low temperatures below 3 K down to 20 mK, C-44 of La3Pd20Ge6 without 4f-electron exhibits a softening proportional to 1/T, which indicates a tunneling of the off-center rare-earth ion in the cage through the potential hill. (c) 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2005.01.112

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER CHEMICAL SOC  

DOI： 10.1021/ja042217p

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記述言語：日本語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：社団法人日本物理学会  

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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.

DOI： 10.1143/JPSJ.74.735

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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.

DOI： 10.1143/JPSJ.74.263

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER PHYSICAL SOC  

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.

DOI： 10.1103/PhysRevLett.93.156409

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1103/PhysRevB.70.184126

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER PHYSICAL SOC  

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

DOI： 10.1103/PhysRevB.69.180511

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

The elastic properties of a filled skutterudite PrOs_4Sb_{12} with a heavy<br />
Fermion superconductivity at T_C=1.85 K have been investigated. The elastic<br />
softening of (C_{11}-C_{12})/2 and C_{44} with lowering temperature down to T_C<br />
indicates that the quadrupolar fluctuation due to the CEF state plays a role<br />
for the Cooper paring in superconducting phase of PrOs_4Sb_{12}. A Debye-type<br />
dispersion in the elastic constants around 30 K revealed a thermally activated<br />
Gamma_{23} rattling due to the off-center Pr-atom motion obeying<br />
tau=tau_{0}exp(E/k_{B}T) with an attempt time tau_0=8.8*10^{-11} se...

DOI： 10.1103/PhysRevB.69.180511

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記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：社団法人日本物理学会  

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...

DOI： 10.1103/PhysRevB.70.184126

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER PHYSICAL SOC  

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

DOI： 10.1103/PhysRevB.68.184109

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Lattice effects in a cerium based clathrate compound Ce_3Pd_20Ge_6 with a<br />
cubic Cr_23C_6-type structure have been investigated by ultrasonic and thermal<br />
expansion measurements. Elastic softenings of (C_11-C_12)/2 and C_44<br />
proportional to the reciprocal temperature 1/T above T_Q1 = 1.25 K are well<br />
described in terms of the quadrupole susceptibility for the ground state<br />
Gamma_8 quartet. A huge softening of 50 % in (C_11-C_12)/2 and a spontaneous<br />
expansion DL/L = 1.9x10^-4 along the [001] direction in particular indicate the<br />
ferroquadrupole ordering of O_2^0 below T_Q1. The elastic anomalies a...

DOI： 10.1103/PhysRevB.68.184109

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IOP PUBLISHING LTD  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PHYSICAL SOC JAPAN  

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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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

&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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<p>PrPt_2_Cd_20_は結晶場基底がガンマ3と予測されている。弾性定数の温度・磁場依存性の測定を行ったところ、全てのモードで15 K付近からそれぞれ低温ソフト化を観測した。四極子感受率を用いた(C_11_-C_12_)/2、C_44_の解析により、2Kまでの結果を結晶場状態で再現することが分かった。今回、希釈冷凍機を用いた20mKまでの測定結果を示し、低温および磁場中での電子状態について議論する。</p>

DOI： 10.11316/jpsgaiyo.71.2.0_2109

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<p>我々は、単結晶カゴ状化合物Pr_3_Pd_20_Ge_6_の多極子秩序の研究を行っている。これまでに、ゼロ磁場・弱磁場中の磁気秩序相での熱膨張の結果について報告してきた。今回、より高磁場中の磁気秩序相での熱膨張測定を行った。講演では、これらの結果をゼロ磁場・弱磁場中の結果と比較して報告する。</p>

DOI： 10.11316/jpsgaiyo.71.2.0_2111

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

<p>超伝導転移温度T_SC_=23 KをもつBa(Fe_0.9_Co_0.1_)_2_As_2_の弾性定数を測定した結果，C_66_が室温からT_SC_に向かって21%のソフト化を示した．その一方で，超音波吸収係数\alpha_66_はT_SC_に向かって発散する臨界減速を捉えた．本研究では，超音波が誘起する歪み\varepsilon_xy_ではなく回転\omega_xy_に着目した．その結果，\alpha_66_の増大が，電子対がもつ十六極子H_z_^\alpha^と\omega_xy_の結合によりその感受率を捉えたとして理解できることを示した．講演では，さらに十六極子秩序と超伝導について議論する．</p>

DOI： 10.11316/jpsgaiyo.71.2.0_1779

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<p>超音波計測により鉄ヒ素超伝導体の吸収係数が超伝導転移温度で発散し、臨界減速を示すことを観測した。一方、弾性定数は室温から超伝導転移に向かって有限のソフト化を示した。超音波が誘起する反対称テンソルである格子の回転が電子対の持つ電気十六極子と結合することにより超音波吸収係数が増大するメカニズムを明らかにし、この系では超伝導転移で同時に電気十六極子秩序が現れていることを明らかにした。</p>

DOI： 10.11316/jpsgaiyo.71.2.0_1897

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<p>横波超音波は歪みと回転を同時に励起し、音速で伝搬する。歪みは電気四極子と結合し、弾性定数のソフト化をもたらす。他方、回転は角運動量をもつ電子系の位相を変調させ、電気十六極子（トルク）と結合し、超音波吸収をもたらすと期待できる。講演では、鉄ヒ素超伝導の軌道縮重した伝導系について、四極子相互作用に位相変調をすることで十六極子—回転相互作用を導出する。超音波物性の新しい可能性についても述べる。</p>

DOI： 10.11316/jpsgaiyo.71.2.0_1778

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DOI： 10.11316/jpsgaiyo.71.1.0_2108

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<p>我々は、単結晶カゴ状化合物Pr_3_Pd_20_Ge_6_の多極子秩序の研究を行っている。これまでに、ゼロ磁場・弱磁場中の磁気秩序相での熱膨張の結果について報告してきた。今回、より高磁場中の磁気秩序相での熱膨張測定を行った。講演では、これらの結果をゼロ磁場・弱磁場中の結果と比較して報告する。</p>

DOI： 10.11316/jpsgaiyo.71.2.0_2111

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DOI： 10.11316/jpsgaiyo.71.1.0_2014

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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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DOI： 10.11316/jpsgaiyo.71.1.0_2400

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DOI： 10.11316/jpsgaiyo.70.2.0_1808

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DOI： 10.1143/JPSJ.81.023710

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

DOI： 10.1143/JPSJ.80.094601

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

DOI： 10.1143/JPSJ.80.073702

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語  

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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