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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

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 EuPt$$_2$$Si$$_2$$

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

 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 EuPt$$_2$$Si$$_2$$ were studied using single-crystalline samples. Anomalous features in EuPt$$_2$$Si$$_2$$ are due to valence fluctuation and/or valence change of the Eu ions at low temperatures.

論文

Electronic states in EuCu$$_2$$(Ge$$_{1-x}$$Si$$_x$$)$$_2$$ 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

 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$$_2$$(Ge$$_{1-x}$$Si$$_x$$)$$_2$$ compounds.Physical property measurements demonstrate a maximum of the antiferromagnetic transition temperature appears at $$x = 0.5$$. Antiferromagnetism then disappears around $$x = 0.7$$ followed by a heavy-fermion formation at higher concentrations. These observations follow the Doniach phase diagram as a function of $$x$$.

論文

Superconducting and Fermi surface properties of single crystal Zr$$_2$$Co

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

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

Superconducting characteristics and Fermi surfaces of Zr$$_2$$Co 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$$d$$ and Co-3$$d$$ 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

 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 UIr$$_2$$Zn$$_{20}$$ and UCo$$_2$$Zn$$_{20}$$

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

 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 UIr$$_2$$Zn$$_{20}$$ and UCo$$_2$$Zn$$_{20}$$ is investigated. UIr$$_2$$Zn$$_{20}$$ shows a reconstruction of the electronic states across the metamagnetic crossover. However, UCo$$_2$$Zn$$_{20}$$ shows a rather continuous evolution. The remarkable difference in both compounds can be accounted for by different degree of hybridization between 5$$f$$ 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

 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 YbCo$$_2$$Zn$$_{20}$$

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

YbCo$$_2$$Zn$$_{20}$$ has a heavy-fermion ground state with an enormously large Sommerfeld coefficient of 8 J/molK$$^2$$, 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 $$B{parallel}{langle}111{rangle}$$. 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 YbCo$$_2$$Zn$$_{20}$$.

論文

Unique Fermi surface and emergence of charge density wave in EuGa$$_4$$ and EuAl$$_4$$

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

Two europium compounds with the same structure EuGa$$_4$$ and EuAl$$_4$$ 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$$_4$$.

論文

Transport properties of UT$$_2$$Zn$$_{20}$$ (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

Transport properties of UT$$_2$$Zn$$_{20}$$ (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 UIr$$_2$$Zn$$_{20}$$ with ferromagnetic instability, implying the electronic modification under magnetic field.

論文

Magnetic-field-enhanced aniferromagnetism in the noncentrosymmetric heavy-fermion superconductor CePt$$_3$$Si

金子 耕士; Stockert, O.*; F${aa}$k, 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

 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 CePt$$_3$$Si 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 $$B{parallel}c$$ 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 $$B{parallel}a$$ at 5T. This is in strong contrast to the inelastic response near the antiferromagnetic ordering vector, where no marked field variations are observed for $$B{parallel}c$$ up to 3.8T. The results reveal that the AFM state in CePt$$_3$$Si, which coexists with superconductivity, is distinctly different from other unconventional superconductors.

論文

Fermi surface and magnetic properties of antiferromagnet EuBi$$_3$$

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

 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$$_3$$ 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$$_4$$

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

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

High quality single crystals of EuGa$$_4$$ 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

 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$$_5$$, CeIrSi$$_3$$ and YbIr$$_2$$Zn$$_{20}$$ is studied in magnetic fields. An electronic instability occurs under pressure in these compounds.

論文

Quadrupole effects in tetragonal crystals PrCu$$_2$$Si$$_2$$ and DyCu$$_2$$Si$$_2$$

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

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

We have investigated quadrupole effects in tetragonal crystals of PrCu$$_2$$Si$$_2$$ and DyCu$$_2$$Si$$_2$$ by means of low-temperature ultrasonic measurements. The elastic constant C$$_{44}$$ of PrCu$$_2$$Si$$_2$$ 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

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

We succeeded in growing single crystals of YbTIn$$_5$$ (T: Co, Rh, Ir), YbGa$$_4$$, YbT$$_2$$Zn$$_{20}$$ (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

 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/K$$^2$$mol, 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

 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 CePt$$_3$$Si, and subsequent findings of Ce$$TX_3$$ (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 CePt$$_3$$Si, 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 CePt$$_3$$Si 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 CePt$$_3$$Si 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

 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 $$m_0$$ ($$m_0$$: rest mass of an electron), consistent with the electronic specific heat coefficient $$gamma$$ = 9.7 mJ/(K$$^{2}$$$$cdot$$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

Fermi surface properties in rare earth and actinide compounds such as CeSn$$_3$$, USi$$_3$$, NpGe$$_3$$ and PuIn$$_3$$ 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$$_5$$ is also discussed.

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