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論文

Heavy fermion state of YbNiSi without local inversion symmetry

中村翔太*; 兵頭一志*; 松本裕司*; 芳賀芳範; 佐藤仁*; 上田茂典*; 三村功次郎*; 斉木克祥*; 磯孝斉*; 山下穣*; et al.

Journal of the Physical Society of Japan, 89(2), p.024705_1 - 024705_5, 2020/02

https://doi.org/10.7566/JPSJ.89.024705

被引用回数：2 パーセンタイル：22.16(Physics, Multidisciplinary)

We have succeeded in growing a new heavy fermion compound YbNiSi by the flux method. From electrical resistivity, magnetization, specific heat, magnetic torque and X-ray photoemission measurements concluded that this compound is a heavy fermion compound exhibiting an antiferromagnetic order at 0.35 K.

論文

Magnetization study on the Ising ferromagnet URhGe with high-precision angle-resolved magnetic field near the hard axis

中村翔太*; 榊原俊郎*; 清水悠晴*; 橘高俊一郎*; 河野洋平*; 芳賀芳範; Pospisil, J.; 山本悦嗣

Progress in Nuclear Science and Technology (Internet), 5, p.123 - 127, 2018/11

https://doi.org/10.15669/pnst.5.123

Dc magnetization measurements have been performed on the orthorhombic Ising ferromagnet Urge. We observed a clear first-order reorientation transition with a small hysteresis and estimated the tricritical point to be around 4 K. The magnetization and the thermal expansion data indicate the presence of a characteristic temperature of about 1 K.

論文

Evidence for chiral -wave superconductivity in URuSi from the field-angle variation of its specific heat

橘高俊一郎*; 清水悠晴*; 榊原俊郎*; 芳賀芳範; 山本悦嗣; 大貫惇睦; 堤康雅*; 野本拓也*; 池田浩章*; 町田一成*

Journal of the Physical Society of Japan, 85(3), p.033704_1 - 033704_4, 2016/03

https://doi.org/10.7566/JPSJ.85.033704

被引用回数：31 パーセンタイル：82.35(Physics, Multidisciplinary)

Low-energy quasiparticle excitations in the heavy-fermion superconductor URuSi were investigated by specific heat measurements as a function of temperature, magnetic field and its angle. Experimental results agree with the theoretical model for a superconducting gap with chiral -wave symmetry.

論文

Field-orientation dependence of low-energy quasiparticle excitations in the heavy-electron superconductor UBe $_{13}$

清水悠晴*; 橘高俊一郎*; 榊原俊郎*; 芳賀芳範; 山本悦嗣; 網塚浩*; 堤康雅*; 町田一成*

Physical Review Letters, 114(14), p.147002_1 - 147002_6, 2015/04

https://doi.org/10.1103/PhysRevLett.114.147002

被引用回数：30 パーセンタイル：81.95(Physics, Multidisciplinary)

Low-energy excitation in the superconducting state of UBe $_{13}$ were studied by means of specific-heat measurements in a rotating field. Quite unexpectedly, the magnetic-field dependence of specific heat is linear in field at low fields with an isotropic field-angle dependence. The observation implies that the gap is fully open over the Fermi surfaces, in contrast to the previous expectation.

論文

Spin-chirality-driven ferroelectricity on a perfect triangular lattice antiferromagnet

三田村裕幸*; 綿貫竜太*; 金子耕士; 小野崎紀道*; 天羽祐太*; 橘高俊一郎*; 小林理気*; 志村恭通*; 山本勲*; 鈴木和也*; et al.

Physical Review Letters, 113(14), p.147202_1 - 147202_5, 2014/10

https://doi.org/10.1103/PhysRevLett.113.147202

被引用回数：22 パーセンタイル：75.33(Physics, Multidisciplinary)

Magnetic field () variation of the electrical polarization $_{c}$ (c) of the perfect triangular lattice antiferromagnet RbFe (MoO) is examined up to the saturation point of the magnetization for B. $_{c}$ is observed only in phases for which chirality is predicted in the in-plane magnetic structures. No strong anomaly is observed in $_{c}$ at the field at which the spin modulation along the c axis exhibits a discontinuity to the commensurate state. These results indicate that ferroelectricity in this compound originates predominantly from triangular-spin chirality. The obtained field-temperature phase diagrams of ferroelectricity well agree with those theoretically predicted for the spin chirality of a Heisenberg spin triangular lattice antiferromagnet.

論文

Anomalous field-angle dependence of the specific heat of heavy-fermion superconductor UPt

橘高俊一郎*; 安幸治*; 榊原俊郎*; 芳賀芳範; 山本悦嗣; 木村憲彰*; 大貫惇睦; 町田一成*

Journal of the Physical Society of Japan, 82(2), p.024707_1 - 024707_5, 2013/02

https://doi.org/10.7566/JPSJ.82.024707

被引用回数：10 パーセンタイル：55.98(Physics, Multidisciplinary)

The field-angle variation of the specific heat of the heavy-fermion superconductor UPt at low temperatures down to 50 mK was investigated. The data show that the unusual upper critical field becomes marked only when the magnetic field is pointed close to the -axis. However, the attempt to observe the superconducting gap structure through field-angle dependence of the specific heat failed, because of the small anisotropy compared to the experimental accuracy of 0.5%. It implies that the field-induced excitation of the heavy quasiparticles occur isotropically with respect to the angle.

論文

Evaluation of spin-triplet superconductivity in SrRuO

前野悦輝*; 橘高俊一郎*; 野村拓司; 米澤進吾*; 石田憲二*

Journal of the Physical Society of Japan, 81(1), p.011009_1 - 011009_29, 2012/01

https://doi.org/10.1143/JPSJ.81.011009

被引用回数：420 パーセンタイル：99.39(Physics, Multidisciplinary)

このレヴューでは、2011年秋の時点で知られている範囲において、層状ルテニウム酸化物SrRuOの超伝導特性について要約しその評価を与える。本論文では、2003年のMackenzieとMaenoによるレビュー以後になされた主たる進展をまとめている。ここでは、特にSrRuOに対して描かれてきたスピン三重項,奇パリティ対形成のシナリオについて、その正当性を厳しく評価することに主眼を置いている。

口頭

CuO $_{2}$ リボン鎖を持つCs $_{2}$ Cu $_{2}$ Mo $_{3}$ O $_{12}$ の磁気相図と磁気構造

藤村明央*; 安井幸夫*; 井川直樹; 吉田幸彦*; 石垣徹*; 河野洋平*; 橘高俊一郎*; 榊原俊郎*

no journal, ,

CuO $_{2}$ リボン鎖系Cs $_{2}$ Cu $_{2}$ Mo $_{3}$ O $_{12}$ は、同様の構造を持つRb $_{2}$ Cu $_{2}$ Mo $_{3}$ O $_{12}$ とは異なる磁気的基底状態をとる。そこで本報では、比熱測定によって、新たにCs $_{2}$ Cu $_{2}$ Mo $_{3}$ O $_{12}$ の磁気相図を作成した。その結果、ゼロ磁場中ではT $_{N}$ =1.85Kで反強磁性体の磁気転移を示すことが分かった。さらに中性子散乱実験によってCs $_{2}$ Cu $_{2}$ Mo $_{3}$ O $_{12}$ の磁気構造と結晶構造を決定し、Rb $_{2}$ Cu $_{2}$ Mo $_{3}$ O $_{12}$ との違いを議論する。

口頭

CuO $_{2}$ リボン鎖を持つA $_{2}$ Cu $_{2}$ Mo $_{3}$ O $_{12}$ (A=Rb, Cs)の磁気的挙動と磁気構造

藤村明央*; 安井幸夫*; 河野洋平*; 橘高俊一郎*; 榊原俊郎*; 井川直樹; 松川健*; 吉田幸彦*; 星川晃範*; 石垣徹*

no journal, ,

CuO $_{2}$ リボン鎖系A $_{2}$ Cu $_{2}$ Mo $_{3}$ O $_{12}$ (A=Rb, Cs)について、磁気比熱を測定し、中性子回折実験によってそれら物質の磁気構造を解析した。Cs $_{2}$ Cu $_{2}$ Mo $_{3}$ O $_{12}$ の中性子回折実験では、磁気反射は全て核反射上に観察されたことなどから、本物質はcollinearな反強磁性を持つことが分った。これらの結果を基にA $_{2}$ Cu $_{2}$ Mo $_{3}$ O $_{12}$ (A=Rb, Cs)の磁気的挙動と磁気構造の関係について議論を行う。

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