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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

Characteristic fermi surface properties of V$$_2$$Ga$$_5$$, CoGa$$_3$$, TiGa$$_3$$, ZrGa$$_3$$, and ZrAl$$_3$$ with different tetragonal structures

照屋 淳志*; 竹田 政貴*; 仲村 愛*; 播磨 尚朝*; 芳賀 芳範; 内間 清春*; 辺土 正人*; 仲間 隆男*; 大貫 惇睦*

Journal of the Physical Society of Japan, 84(5), p.054703_1 - 054703_15, 2015/05

 被引用回数:3 パーセンタイル:58.15(Physics, Multidisciplinary)

A series of metallic compounds with the tetragonal symmetry are investigated to reveal the relationship between the structural dimensionality and the electronic structure. By combining the de Haas-van Alphen experiments and band structure calculations, a flat one-dimensional Fermi surface is revealed in V$$_2$$Ga$$_5$$ which is characterized by a chain like arrangement of atoms. On the other hand, Co$$_3$$Ga with the nearly cubic symmetry has pyramidal Fermi surfaces with flat {111} planes, similar to Ni$$_3$$Ga with the ideal cubic structure.

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