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論文

Antiferromagnetic order and crystalline electric field in noncentrosymmetric hexagonal RuAs ( = Sm and Yb)

廣瀬雄介; 津久井拓樹*; 加藤佑汰*; 庄野里菜*; 本多史憲*; 青木大*; 摂待力生*

Physical Review Materials (Internet), 10(8), p.084407_1 - 084407_8, 2026/08

https://doi.org/10.1103/nr4t-wypp

被引用回数：0

We investigated the electronic properties of RuAs ( = La, Ce, Sm, and Yb) using single-crystalline samples grown by the Bi-flux method. These compounds crystallize in the non-centrosymmetric hexagonal LaCoP -type structure, featuring both a chain and triangular arrangement of magnetic ions. From the electrical resistivity, magnetic susceptibility, and specific heat measurements, we have found that SmRuAs As order antiferromagnetically below the Nel temperature of 1.5 and 9.5~K, respectively. Despite the relatively high transition temperature of YbRuAs, its magnetic field-temperature phase diagram reveals that the antiferromagnetic state collapses at a low field of $mu_0H_{rm C}$ ~=~1.7~T, accompanied by a non-linear magnetization anomaly. The magnetization curve is similar to that of chiral helical magnets. The small critical field and characteristic magnetization curve in YbRuAs likely originate from magnetic frustration.

論文

Magnetic phase diagram and Fermi surface properties of the heavy-fermion antiferromagnet UPd $_{2}$ Cd $_{20}$

廣瀬雄介; 土塔寛*; 竹内徹也*; 三宅厚志*; 徳永将史*; 仲村愛*; 本間佳哉*; 青木大*; 本多史憲*; 摂待力生*

Journal of Physics; Condensed Matter, 38(24), p.245601_1 - 245601_11, 2026/06

https://doi.org/10.1088/1361-648X/ae72e0

被引用回数：0 パーセンタイル：0.00(Physics, Condensed Matter)

The electronic state of UPd $_{2}$ Cd $_{20}$ , which exhibits a magnetic transition at $_{rm N}$ 5 K, is investigated by means of transport, high-field magnetization up to 55 T, specific heat in magnetic fields, and de Haas-van Alphen (dHvA) measurements, and compared with the non-5f compound ThPd $_{2}$ Cd $_{20}$ . A metamagnetic transition is observed at $_{0}$ $H_{rm c}$ 15-20 T, which continuously connects to $_{rm N}$ in the H-T phase diagram. Although the magnetization reaches large values at high fields, the ordered magnetic moment is estimated to be small from small anomalies in specific heat at $_{rm N}$ and in magnetization at $_{rm c}$ . The observed dHvA frequencies reveal enhanced cyclotron effective masses of 30 $m_{0}$ , which are much heavier than those in ThPd $_{2}$ Cd $_{20}$ . These experimental results indicate that 5f-derived bands contribute to the large electronic specific heat coefficient of 670 mJ/mol K $^{2}$ , demonstrating the dual localized-itinerant character of 5f electrons in UPd $_{2}$ Cd $_{20}$ .

論文

Ultrasonic observation of small Fermi surfaces in LaIn $_{5}$ ( = Co, Rh, Ir)

栗原綾輔*; 廣瀬雄介; 松井一樹*; 三宅厚志*; 角田竜馬*; 近藤雅起*; 摂待力生*; 赤津光洋*; 根本祐一*; 矢口宏*; et al.

JJAP Conference Proceedings (Internet), 12, p.011006_1 - 011006_6, 2026/02

https://doi.org/10.56646/jjapcp.12.0_011006

強磁場における量子限界状態では、電子相関や電子格子相互作用に由来する新奇な電子状態が提案されている。本研究では、7Tという比較的低磁場で量子限界に達すると考えられているLaRhIn $_{5}$ 及び関連物質LaIn $_{5}$ (T:遷移金属)を対象とし、強磁場での超音波測定を行った。音響ドハース振動から、先行研究と同様のLaRhIn $_{5}$ の小さなフェルミ面を観測し、T=CoおよびIrでも量子振動がみられこれまで観測されていなかった100T以下の小さなフェルミ面の存在を明らかにした。遷移金属の電子が小さなフェルミ面への寄与を示唆する結果であった。

論文

Metallization and pressure-induced superconductivity in carrier doped excitonic insulator (Ta $_{1-x}$ Ti)NiSe

土田駿*; 廣瀬雄介; 関川卓也; 大野義章*; 平原卓也*; 佐野純佳*; 河口彰吾*; 小林慎太郎*; 上床美也*; 摂待力生*

Journal of the Physical Society of Japan, 94(11), p.114703_1 - 114703_7, 2025/10

https://doi.org/10.7566/JPSJ.94.114703

被引用回数：2 パーセンタイル：55.25(Physics, Multidisciplinary)

本研究では、励起子絶縁体TaNiSeへのキャリアドープ効果を調べるために、(Ta $_{1-x}$ Ti)NiSeの単結晶合成し、電気抵抗ホール係数 $R_{rm H}$ およびバンド計算を行った。TaサイトのTi元素置換により、結晶構造は変化せず励起子絶縁体転移温度 $T_{rm c}$ は連続的に抑制され=0.104で83Kまで抑制された。置換量を増やしていくと、半導体的なや $R_{rm H}$ の低温での増大が著しく抑制され、では金属的な振る舞いに変わることを見出し、励起子相関のある金属状態が実現されている可能性がある。この金属化はバンド計算により、キャリアドーピング効果によって説明できる。このキャリアドープ物質を加圧していくと、2.6GPa以上で超伝導となることを明らかにした。この圧力は母物質TaNiSeの圧力誘起超伝導が現れる8GPaよりもはるかに小さく、Ti置換によるキャリアドープが超伝導に有利に働いたと考えられる。

論文

Characteristic Fermi surface properties in -electron systems

大貫惇睦*; 摂待力生*; 芳賀芳範; 竹内徹也*; 辺土正人*; 仲間隆男*

Quantum Science; The Frontier of Physics and Chemistry, p.21 - 63, 2022/10

https://doi.org/10.1007/978-981-19-4421-5_2

Fermi surfaces of -electron systems and the novel physical properties related with crystal symmetry, electronic correlations and magnetic interactions are reviewed. The key materials are CeRhIn, CeIr, EuCuGe and EuPtSi.

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：8 パーセンタイル：49.09(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：3 パーセンタイル：68.55(Physics, Atomic, Molecular & Chemical)

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

Fermi surface, magnetic, and superconducting properties in actinide compounds

大貫惇睦; 摂待力生*; 芳賀芳範; 町田洋*; 井澤公一*; 本多史憲*; 青木大*

Comptes Rendus Physique, 15(7), p.616 - 629, 2014/08

https://doi.org/10.1016/j.crhy.2014.06.005

被引用回数：8 パーセンタイル：49.19(Astronomy & Astrophysics)

Electronic state, magnetism and superconducting properties of heavy fermion compounds UPt, NpPdAl and UGe have been investigated. In particular, the Fermi surface study by using various experimental methods is described.

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 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：46 パーセンタイル：84.26(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：3 パーセンタイル：25.39(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

被引用回数：3 パーセンタイル：13.58(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

被引用回数：0 パーセンタイル：0.00(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：5 パーセンタイル：22.71(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

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.

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：4 パーセンタイル：31.03(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

Anisotropic spin fluctuations in the heavy fermion systems; Case studies of CePdAl and NpPdAl

酒井宏典; 中堂博之; 徳永陽; 神戸振作; 芳賀芳範; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*; 本間佳哉*; 青木大*; et al.

Journal of the Physical Society of Japan, 81(Suppl.B), p.SB003_1 - SB003_6, 2012/12

https://doi.org/10.1143/JPSJS.81SB.SB003

被引用回数：8 パーセンタイル：47.82(Physics, Multidisciplinary)

CeIn (=Co, Rh, Ir)及びGa (=U, Np, Pu)という化学式を持つ一連の化合物(115系と称する)、核磁気共鳴(NMR)測定の結果得られるナイトシフトと緩和率の解析から、反強磁性スピン揺らぎのXY型異方性がd波超伝導発現に有利であるとわかってきた。この仮説を確かめるために、115系化合物と類似の結晶構造を有するCePdAlとNpPdAlにおいてスピン揺らぎの異方性がどうなっているかを検証した。CePdAlは、イジング異方性を持つ反強磁性体であり、スピン揺らぎも同じくイジング型の異方性を示した。d波超伝導体NpPdAlは、転移温度直上の通常状態においてXY型の反強磁性磁気揺らぎを有していることがわかった。

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

被引用回数：1 パーセンタイル：10.12(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

Fermi surface and superconducting properties of non-centrosymmetric LaNiC

広瀬雄介*; 岸野利彦*; 阪口準也*; 三浦泰直*; 本多史憲*; 竹内徹也*; 山本悦嗣; 芳賀芳範; 播磨尚朝*; 摂待力生*; et al.

Journal of the Physical Society of Japan, 81(11), p.113703_1 - 113703_4, 2012/11

https://doi.org/10.1143/JPSJ.81.113703

被引用回数：25 パーセンタイル：72.80(Physics, Multidisciplinary)

Fermi surface and superconducting properties were investigated on an non-centrosymmetric LaNiC compound. Reflecting the crystal structure characteristics, the Fermi surfaces are split due to the antisymmetric spin-orbit interaction. On the other hand, thermodynamic property in the superconducting state follow the conventional BCS theory despite the splitting of Fermi surfaces.

論文

Electrical and magnetic properties of quasicrystal approximants RCd (R: rare earth)

森晶宣*; 太田尚志*; 吉内伸吾*; 岩川健*; 田賀悠記*; 広瀬雄介*; 竹内徹也*; 山本悦嗣; 芳賀芳範; 本多史憲*; et al.

Journal of the Physical Society of Japan, 81(2), p.024720_1 - 024720_10, 2012/02

https://doi.org/10.1143/JPSJ.81.024720

被引用回数：60 パーセンタイル：86.93(Physics, Multidisciplinary)

Single crystals of quasicrystal approximants RCd (R: rare earths) were prepared using the self-flux method and subsequent annealing. A structural transition was confirmed in some of these crystals. Antiferromagnetic ordering was observed for R = Nd, Sm, Tb and Dy. It was found that the structural order-disorder transition has a great influence on the magnetic ordering and transport properties.