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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 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.
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:21 パーセンタイル:72.6(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.
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:35 パーセンタイル:81.11(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.
山本 悦嗣; 広瀬 雄介*; 榎 健太郎*; 三田村 勝哉*; 杉山 清寛*; 竹内 徹也*; 萩原 政幸*; 金道 浩一*; 芳賀 芳範; 摂待 力生*; et al.
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UCdは格子定数a=9.29のBaHg型立方晶をとり、その最近接U-U間距離は6.56と大きい。また、UCdは=5Kとこの系の化合物では転移温度が高く、また常磁性領域における電子比熱係数は840mJ/Kmolと大きい。これまでに単結晶による物性測定が行われ、//100方向の磁気相図が得られている。今回新たに、UCdの//100, 110, 111の1.3Kにおける強磁場磁化曲線を測定し、転移磁場及び磁場誘起強磁性相における磁気異方性を見いだした。