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論文

Field-induced insulator-metal transition in EuTe

竹内徹也*; 本多史憲*; 青木大*; 芳賀芳範; 木田孝則*; 鳴海康雄*; 萩原政幸*; 金道浩一*; 軽部皓介*; 播磨尚朝*; et al.

Journal of the Physical Society of Japan, 93(4), p.044708_1 - 044708_10, 2024/04

https://doi.org/10.7566/JPSJ.93.044708

Electrical and magnetic properties of divalent europium antiferromagnet EuTe are studied on single crystals grown from Te-flux method. Antiferromagnetism occurs at 11 K with an insulating ground state. Application of magnetic field induces a sudden resistance drop leading to a phase transition to metallic state. Energy band calculations reveal the appearance of a Fermi surface pocket with Te-5p character induced by the polarized Eu moments.

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

Nonmagnetic-magnetic transition and magnetically ordered structure in SmS

吉田章吾*; 小山岳秀*; 山田陽彦*; 中井祐介*; 上田光一*; 水戸毅*; 北川健太郎*; 芳賀芳範

Physical Review B, 103(15), p.155153_1 - 155153_5, 2021/04

https://doi.org/10.1103/PhysRevB.103.155153

被引用回数：1 パーセンタイル：7.51(Materials Science, Multidisciplinary)

SmS, a protopypical intermediate valence compound, has been studied by performing high-pressure nuclear magnetic resonance measurements. The observation of an additional signal at high pressure gives evidence of a magnetic phase transition. The cancellation of the hyperfined fields at the S site suggests a type-II antiferromagnetic structure.

論文

Structural characterization and magnetic behavior of uranium compound UPtAl $_{15}$

芳賀芳範; 菅井孝志*; 松本裕司*; 山本悦嗣

JPS Conference Proceedings (Internet), 29, p.013003_1 - 013003_5, 2020/02

https://doi.org/10.7566/JPSCP.29.013003

Crystal structure and magnetic property of UPtAl $_{15}$ is investigated. A single crystal X-ray diffraction experiment identified the hexagonal unit cell with a disordered structure in the uranium containing layer. A series of superstructure reflections were found. They are successfully indexed as (/3 /3 0), however, with a streak along the direction. A layered structure model containing honeycomb arrangement of uranium atoms is proposed. Preliminary magnetization measurements on a polycrystalline sample are also presented.

論文

Crystal structure and magnetic properties of new ternary uranium compound UTiBi

本山岳*; 芳賀芳範; 山口明*; 川崎郁斗*; 住山昭彦*; 山村朝雄*

Progress in Nuclear Science and Technology (Internet), 5, p.157 - 160, 2018/11

https://doi.org/10.15669/pnst.5.157

The crystal structure of the newly discovered compound UTiBi was determined from single-crystal X-ray diffraction data. This compound shows an antiferromagnetic ordering at 31.5 K. A clear anomaly was observed at the transition temperature on the temperature dependence of magnetic susceptibility and electrical resistivity.

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：19 パーセンタイル：75.32(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

Effect of pressure on magnetism of UIrGe

Pospisil, J.; 郷地順*; 芳賀芳範; 本多史憲*; 上床美也*; 立岩尚之; 神戸振作; 長崎尚子*; 本間佳哉*; 山本悦嗣

Journal of the Physical Society of Japan, 86(4), p.044709_1 - 044709_6, 2017/04

https://doi.org/10.7566/JPSJ.86.044709

被引用回数：9 パーセンタイル：56.7(Physics, Multidisciplinary)

The effect of hydrostatic pressure on the electronic state of the antiferromagnet UIrGe is reported. A series of resistivity measurements up to 15 GPa demonstrated the Neel temperature decreases with increasing pressure and vanishes around 12 GPa. The transition from antiferromagnetic to paramagnetic phase appears to be of first order. A moderate increase in the effective mass was detected in the vicinity of the critical pressure.

論文

Large orbital magnetic moment and its quenching in the itinerant uranium intermetallic compounds UGa (=Ni, Pd, Pt)

金子耕士; 目時直人; Bernhoeft, N.*; Lander, G. H.; 石井慶信; 池田修悟; 常磐欣文; 芳賀芳範; 大貫惇睦

Physical Review B, 68(21), p.214419_1 - 214419_9, 2003/12

https://doi.org/10.1103/PhysRevB.68.214419

被引用回数：59 パーセンタイル：88.71(Materials Science, Multidisciplinary)

UTGa(T=Ni, Pd, Pt)は、強い遍歴性を示す反強磁性体である。この内Ni, Ptでは常磁性状態において、ほぼ同じ結晶構造を持ち、電子構造も酷似しているにもかかわらず、c底面内の最隣接間相互作用の符号が異なっている点は興味深い。粉末中性子回折実験による詳細な結晶構造解析の結果、構造の一部を成すUGaブロックの局所的な歪みにT=Ni, Pd, Ptで系統性があることを明らかにした。またTで磁歪の存在を見出し、それが3者の磁気構造の違いに対応した系統性を示している事を明らかにした。T=Ni, Ptについては、単結晶中性子回折実験から磁気形状因子を明らかにし、軌道磁気モーメントの大きな寄与の存在を明らかにするとともに、その凍結の度合いが、帯磁率における遍歴性と対応して、両者で大きく異なっている事を明らかにした。以上の結果から、UTGaにおけるUGaブロックの局所的な歪みが、最隣接間相互作用の符号に加え、磁歪,軌道磁気モーメントの凍結,遍歴性に密接に関与しているとともに、5fの遍歴系において軌道が重要な役割を演じる事を示唆している。

論文

Ground-state magnetic structure of CeRh $_{2}$ Si $_{2}$ and response to hydrostatic pressure as studied by neutron diffraction

河原崎修三*; 佐藤真直*; 都福仁*; 千種唯達*; 渡辺健二*; 目時直人; 小池良浩; 西正和*

Physical Review B, 61(6), p.4167 - 4173, 2000/02

https://doi.org/10.1103/PhysRevB.61.4167

被引用回数：86 パーセンタイル：93.71(Materials Science, Multidisciplinary)

CeRh $_{2}$ Si $_{2}$ は35Kで反強磁性に転移する。これに10kbar程度の圧力を加えると反強磁性秩序が消失し0.4K以下で超伝導が出現する。この物性の磁気構造の圧力依存性を中性子散乱実験によって調べた。

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