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論文

Anomalous ferromagnetic ordering in EuCuP

伊覇航*; 垣花将司*; 松田進弥*; 本多史憲*; 芳賀芳範; 竹内徹也*; 中島美帆*; 天児寧*; 郷地順*; 上床美也*; et al.

Journal of Alloys and Compounds, 788, p.361 - 366, 2019/06

https://doi.org/10.1016/j.jallcom.2019.02.213

Ferromagnetic ordering of EuCuP is investigated on a single crystal sample grown from tin flux. Application of hydrostatic pressure up to 8 GPa stabilizes ferromagnetic ordering, suggesting divalent Eu is stable. The Hall effect and resistivity measurements show that EuCuP is a low-carrier ferromagnetic metal with a characteristic resistivity cusp appearing at the ferromagnetic transition temperature.

論文

Effects of magnetic field and pressure on the valence-fluctuating antiferromagnetic compound EuPtSi

竹内徹也*; 屋良朝之*; 安次富洋介*; 伊覇航*; 垣花将司*; 中島美帆*; 天児寧*; 本多史憲*; 本間佳哉*; 青木大*; et al.

Journal of the Physical Society of Japan, 87(7), p.074709_1 - 074709_14, 2018/07

https://doi.org/10.7566/JPSJ.87.074709

被引用回数：2 パーセンタイル：29.91(Physics, Multidisciplinary)

Effects of magnetic field and pressure on the Kondo-like behavior in the valence-fluctuating antiferromagnetic compound EuPtSi were studied using single-crystalline samples. Anomalous features in EuPtSi are due to valence fluctuation and/or valence change of the Eu ions at low temperatures.

論文

Electronic states in EuCu(Ge $_{1-x}$ Si) based on the doniach phase diagram

伊覇航*; 屋良朝之*; 安次富洋介*; 垣花将司*; 竹内徹也*; 本多史憲*; 仲村愛*; 青木大*; 郷地順*; 上床美也*; et al.

Journal of the Physical Society of Japan, 87(6), p.064706_1 - 064706_14, 2018/06

https://doi.org/10.7566/JPSJ.87.064706

被引用回数：2 パーセンタイル：29.91(Physics, Multidisciplinary)

We succeeded in growing single crystals of the series of EuCu(Ge $_{1-x}$ Si) compounds.Physical property measurements demonstrate a maximum of the antiferromagnetic transition temperature appears at . Antiferromagnetism then disappears around followed by a heavy-fermion formation at higher concentrations. These observations follow the Doniach phase diagram as a function of .

論文

Superconducting and Fermi surface properties of single crystal ZrCo

照屋淳志*; 垣花将司*; 竹内徹也*; 青木大*; 本多史憲*; 仲村愛*; 芳賀芳範; 松林和幸*; 上床美也*; 播磨尚朝*; et al.

Journal of the Physical Society of Japan, 85(3), p.034706_1 - 034706_10, 2016/03

https://doi.org/10.7566/JPSJ.85.034706

パーセンタイル：100(Physics, Multidisciplinary)

Superconducting characteristics and Fermi surfaces of ZrCo are experimentally studied on a single crystal sample grown by Bridgman technique. Thermodynamic quantities in the superconducting state such as specific heat and magnetization show deviation from a single-gap the BCS model and can be attributed on the band structure with the dominant contribution of Zr-4 and Co-3 components.

論文

Split Fermi surface properties in Ulmannite NiSbS and PdBiSe with the cubic chiral crystal structure

垣花将司*; 照屋淳志*; 西村憲吾*; 仲村愛*; 竹内徹也*; 芳賀芳範; 播磨尚朝*; 辺土正人*; 仲間隆男*; 大貫惇睦

Journal of the Physical Society of Japan, 84(9), p.094711_1 - 094711_8, 2015/09

https://doi.org/10.7566/JPSJ.84.094711

被引用回数：8 パーセンタイル：31.29(Physics, Multidisciplinary)

Fermi surface properties of illuminate NiSbS and PbBiSe have been clarified by de Haas-van Alphen effect, resistivity and specific heat measurements. Fermi surfaces were found to split into two, reflecting the non-centrosymmetric crystal structure. The splitting energies have been estimated experimentally. Those are originated from spin-orbit interactions.

論文

Crossover phase diagram and electronic state in the heavy-fermion metamagnets UIrZn $_{20}$ and UCoZn $_{20}$

広瀬雄介*; 竹内徹也*; 本多史憲*; 吉内伸吾*; 萩原政幸*; 山本悦嗣; 芳賀芳範; 摂待力生*; 大貫惇睦

Journal of the Physical Society of Japan, 84(7), p.074704_1 - 074704_10, 2015/07

https://doi.org/10.7566/JPSJ.84.074704

被引用回数：5 パーセンタイル：43.76(Physics, Multidisciplinary)

Magnetic phase diagram of two heavy fermion metamagnets UIrZn $_{20}$ and UCoZn $_{20}$ is investigated. UIrZn $_{20}$ shows a reconstruction of the electronic states across the metamagnetic crossover. However, UCoZn $_{20}$ shows a rather continuous evolution. The remarkable difference in both compounds can be accounted for by different degree of hybridization between 5 and ligand electrons.

論文

X-ray absorption spectroscopy and novel electronic properties in heavy fermion compounds YbT $_{2}$ Zn $_{20}$ (T: Rh and Ir)

本多史憲*; 広瀬雄介*; 三宅厚志*; 水牧仁一朗*; 河村直己*; 筒井智嗣*; 綿貫徹; 渡辺真仁*; 竹内徹也*; 摂待力生*; et al.

Journal of Physics; Conference Series, 592(1), p.012021_1 - 012021_5, 2015/03

https://doi.org/10.1088/1742-6596/592/1/012021

被引用回数：1 パーセンタイル：43.74

重い電子系化合物YbT $_{2}$ Zn $_{20}$ (T: Rh and Ir)について、X線吸収分光法によりYb価数観察を行った。いずれの化合物でもYb価数は温度依存性を示し、約100K以下で冷却とともにYb価数が減少する変化が見られた。これは、同型化合物であるYbCo $_{2}$ Zn $_{20}$ において温度依存性が見られないこととは対照的な結果である。

論文

Field-induced order in heavy-fermion compound YbCoZn $_{20}$

金子耕士; Raymond, S.*; Ressouche, E.*; Lapertot, G.*; 竹内徹也*; 広瀬雄介*; 本多史憲*; 大貫惇睦

JPS Conference Proceedings (Internet), 3, p.011061_1 - 011061_5, 2014/06

https://doi.org/10.7566/JPSCP.3.011061

YbCoZn $_{20}$ has a heavy-fermion ground state with an enormously large Sommerfeld coefficient of 8 J/molK, and that is sensitive to external fields. Whereas pressure induces antiferromagnetic order, magnetic field induces metamagnetic transitions around 0.5 T, and new ordered state appears above 6 T for . In order to get insights into electronic states and its magnetic field response, neutron scattering experiments on single crystalline samples were carried. In a field-induced phase, magnetic reflections were successfully observed, which has a different propagation vector to that of pressure induced phase. Inelastic neutron scattering probes a crystal-field excitation at a low excitation energy which overlaps to quasielastic response. The results suggest degenerated energy scale, and that leads to variety of external response in YbCoZn $_{20}$ .

論文

Unique Fermi surface and emergence of charge density wave in EuGa and EuAl

仲村愛*; 平仲裕一*; 辺土正人*; 仲間隆男*; 三浦泰直*; 堤泰樹*; 森晶宣*; 石田一裕*; 三田村勝哉*; 広瀬雄介*; et al.

JPS Conference Proceedings (Internet), 3, p.011012_1 - 011012_6, 2014/06

https://doi.org/10.7566/JPSCP.3.011012

Two europium compounds with the same structure EuGa and EuAl have been investigated. The Fermi surfaces revealed experimentally show a peculiar feature: flat Fermi surface sheets appear parallel to the tetragonal [110] planes. Reflecting this, a charge density wave transition due to the nesting of Fermi surface sheets has been observed in EuAl.

論文

Transport properties of UTZn $_{20}$ (T: Co, Ir)

広瀬雄介*; 竹内徹也*; 吉内伸吾*; 山本悦嗣; 芳賀芳範; 摂待力生*; 大貫惇睦

JPS Conference Proceedings (Internet), 3, p.011056_1 - 011056_6, 2014/06

https://doi.org/10.7566/JPSCP.3.011056

Transport properties of UTZn $_{20}$ (T: Co, Ir) have been investigated by measuring Hall effect. Overall behavior is explained by the skew scattering on the impurity model at high temperatures and the periodic Anderson model at low temperatures. Rather complicated behavior was observed in UIrZn $_{20}$ with ferromagnetic instability, implying the electronic modification under magnetic field.

論文

Magnetic-field-enhanced aniferromagnetism in the noncentrosymmetric heavy-fermion superconductor CePtSi

金子耕士; Stockert, O.*; Fk, B.*; Raymond, S.*; Skoulatos, M.*; 竹内徹也*; 大貫惇睦*

Physical Review B, 89(24), p.241105_1 - 241105_5, 2014/06

AA2014-0242.pdf:0.39MB

https://doi.org/10.1103/PhysRevB.89.241105

被引用回数：1 パーセンタイル：92.3(Materials Science, Multidisciplinary)

The effect of magnetic field on the static and dynamic spin correlations in the non-centrosymmetric heavy-fermion superconductor CePtSi was investigated by neutron scattering. The application of a magnetic field B increases the antiferromagnetic (AFM) peak intensity. This increase depends strongly on the field direction: for the intensity increases by a factor of 4.6 at a field of 6.6T, which corresponds to more than a doubling of the AFM moment, while the moment increases by only 10% for at 5T. This is in strong contrast to the inelastic response near the antiferromagnetic ordering vector, where no marked field variations are observed for up to 3.8T. The results reveal that the AFM state in CePtSi, which coexists with superconductivity, is distinctly different from other unconventional superconductors.

論文

Fermi surface and magnetic properties of antiferromagnet EuBi

仲村愛*; 平仲裕一*; 辺土正人*; 仲間隆男*; 立津慶幸*; 眞榮平孝裕*; 三浦泰直*; 森晶宣*; 堤泰樹*; 広瀬雄介*; et al.

Journal of the Physical Society of Japan, 82(12), p.124708_1 - 124708_6, 2013/12

https://doi.org/10.7566/JPSJ.82.124708

被引用回数：13 パーセンタイル：28.22(Physics, Multidisciplinary)

Fermi surfaces and magnetic properties of an antiferromagnet EuBi were investigated on a flux-grown single crystal. A critical magnetic field of 225 kOe where the magnetic moments are forced to align ferromagnetically was well explained by the magnetic exchange interaction based on a two-sublattice model. The Fermi surface characteristics are in agreement with the theoretical prediction indicating a fully magnetic divalent state in Eu atoms.

論文

Magnetic and Fermi surface properties of EuGa

仲村愛*; 平仲裕一*; 辺土正人*; 仲間隆男*; 三浦泰直*; 堤泰樹*; 森晶宣*; 石田一裕*; 三田村勝哉*; 広瀬雄介*; et al.

Journal of the Physical Society of Japan, 82(10), p.104703_1 - 104703_10, 2013/10

https://doi.org/10.7566/JPSJ.82.104703

被引用回数：23 パーセンタイル：16.99(Physics, Multidisciplinary)

High quality single crystals of EuGa have been grown from Ga flux. Electrical resistivity, magnetic susceptibility, high-field magnetization, specific heat, thermoelectric power and de Haas-van Alphen effect were investigated. Antiferromagnetic transition due to divalent Eu atoms were observed at 16.5 K. A charge density wave transition was also found under high pressure accompanied by a Fermi surface reconstruction. These observations were fully accounted for by the Fermi surface topology and corresponding band calculations.

論文

Heavy fermions and unconventional superconductivity in high-quality single crystals of rare-earth and actinide compounds

大貫惇睦; 摂待力生*; 杉山清寛*; 竹内徹也*; 本多史憲*; 芳賀芳範; 山本悦嗣; 松田達磨; 立岩尚之; 青木大*; et al.

Journal of the Korean Physical Society, 63(3), p.409 - 415, 2013/08

https://doi.org/10.3938/jkps.63.409

被引用回数：1 パーセンタイル：84.55(Physics, Multidisciplinary)

Characteristics of heavy fermion and unconventional superconductivity in rare-earth and actinide compounds are clarified by the de Haas-van Alphen experiments. The effect of pressure on the electronic states of CeRhIn, CeIrSi and YbIrZn $_{20}$ is studied in magnetic fields. An electronic instability occurs under pressure in these compounds.

論文

Quadrupole effects in tetragonal crystals PrCuSi and DyCuSi

三本啓輔*; 後藤沙織*; 根本祐一*; 赤津光洋*; 後藤輝孝*; Dung, N. D.*; 松田達磨; 芳賀芳範; 竹内徹也*; 杉山清寛*; et al.

Journal of Physics; Condensed Matter, 25(29), p.296002_1 - 296002_8, 2013/07

https://doi.org/10.1088/0953-8984/25/29/296002

パーセンタイル：100(Physics, Condensed Matter)

We have investigated quadrupole effects in tetragonal crystals of PrCuSi and DyCuSi by means of low-temperature ultrasonic measurements. The elastic constant C $_{44}$ of PrCuSi exhibits pronounced softening below 70 K, which is described in terms of a quadrupole susceptibility for a doublet ground state.

論文

Single crystal growth and various electronic states in Yb-based compounds

広瀬雄介*; 吉内伸吾*; 西村尚人*; 阪口準也*; 榎健太郎*; 岩川健*; 三浦泰直*; 杉山清寛*; 大貫惇睦; 摂待力生*; et al.

Journal of the Korean Physical Society, 62(12), p.1858 - 1861, 2013/06

https://doi.org/10.3938/jkps.62.1858

パーセンタイル：100(Physics, Multidisciplinary)

We succeeded in growing single crystals of YbTIn (T: Co, Rh, Ir), YbGa, YbTZn $_{20}$ (T: Co, Rh, Ir), etc. The electronic and magnetic properties are clarified by measuring the electrical resistivity, magnetic susceptibility, magnetization, specific heat and de Haas-van Alphen effect.

論文

Electronic states in antiferromagnet UCd $_{11}$ and reference compound ThCd $_{11}$ ; Studied by the de Haas-van Alphen effect

広瀬雄介*; 三浦泰直*; 堤泰樹*; 吉内伸吾*; 大家政洋*; 杉山清寛*; 竹内徹也*; 山上浩志*; 山本悦嗣; 芳賀芳範; et al.

Physica Status Solidi (B), 250(3), p.642 - 645, 2013/03

https://doi.org/10.1002/pssb.201200765

被引用回数：3 パーセンタイル：77.51(Physics, Condensed Matter)

Electronic states of an antiferromagnet UCd $_{11}$ and its reference compound ThCd $_{11}$ were investigated by means of de Haas-van Alphen (dHvA) effect. From the cyclotron effective mass determined from the dHvA oscillation, the electronic specific heat of UCd $_{11}$ was estimated as 100 mJ/Kmol, much smaller than 840 in the previous report. The result suggests that magnetic excitation contributes significantly to the specific heat.

論文

Neutron scattering study on high-quality single crystals of non-centrosymmetric heavy-fermion superconductor CePt $_{3}$ Si

金子耕士; Stockert, O.*; Skoulatos, M.*; Schneidewind, A.*; 竹内徹也*; 松田達磨; 芳賀芳範; 摂待力生*; 大貫惇睦; 目時直人

Journal of the Physical Society of Japan, 81(Suppl.B), p.SB006_1 - SB006_7, 2012/12

https://doi.org/10.1143/JPSJS.81SB.SB006

被引用回数：2 パーセンタイル：75.66(Physics, Multidisciplinary)

The discovery of heavy-fermion superconductivity in non-centrosymmetric compound CePtSi, and subsequent findings of Ce (T: transition metal, X: Si, Ge) bring a new essence in the condensed matter physics, since a novel type of superconducting properties is expected to come out. In CePtSi, the compound shows an antiferromagnetic (AFM) order at $T_{rm N }$ =2.2 K and enters into a heavy-fermion superconducting state below $T_{rm SC}{sim}$ 0.5 K. Through neutron scattering experiments under external magnetic field, we identified anomalous field response in CePtSi in the AFM state; AFM intensity showed enormous enhancement with increasing an applied field. The intensity kept increasing up to 7 T with the kink at around the additional phase boundary. These features suggest that the magnetic order in CePtSi is not a simple AFM one, and imply that large fraction of magnetic response could be still missing in this compound.

論文

de Haas-van Alphen effect and Fermi surface properties in V $_{5}$ Si $_{3}$

堤泰樹*; 阪口準也*; 三浦泰直*; 松田達磨; 芳賀芳範; 竹内徹也*; 播磨尚朝*; 摂待力生*; 大貫惇睦

Journal of the Physical Society of Japan, 81(Suppl.B), p.SB027_1 - SB027_4, 2012/12

https://doi.org/10.1143/JPSJS.81SB.SB027

パーセンタイル：100(Physics, Multidisciplinary)

We succeeded in growing high-quality single crystals of V $_{5}$ Si $_{3}$ with a high melting point of 2010 $^{circ}$ C, and carried out the electrical resistivity, specific heat, magnetic susceptibility, and the de Haas-van Alphen measurements to clarify the electronic properties. The Fermi surface is small in volume and is well explained by the result of energy band calculations. The cyclotron mass is in the range from 5.3 to 0.2 (: rest mass of an electron), consistent with the electronic specific heat coefficient = 9.7 mJ/(K $^{2}$ mol).

論文

High-quality single crystal growth and unique electronic states under magnetic field and pressure in rare earth and actinide compounds

大貫惇睦; 摂待力生*; 竹内徹也*; 杉山清寛*; 本多史憲*; 芳賀芳範; 山本悦嗣; 松田達磨; 立岩尚之; 青木大*; et al.

Journal of the Physical Society of Japan, 81(Suppl.B), p.SB001_1 - SB001_18, 2012/12

https://doi.org/10.1143/JPSJS.81SB.SB001

Fermi surface properties in rare earth and actinide compounds such as CeSn, USi, NpGe and PuIn are clarified by the de Haas-van Alphen experiments on the bases of the energy band calculations. The pressure-induced electronic instability including unconventional superconductivity observed in CeRhIn is also discussed.