Electrical and Magnetic Properties of a Single Crystal UCu_2Si_2(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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We have succeeded in growing a high-quality single crystal of UCu_2Si_2 with the tetragonal structure by the Sn-flux method and measured the electrical resistivity, magnetic susceptibility, magnetization and specific heat. UCu_2Si_2 is found to order antiferromagnetically below T_N=106 K, and follows a successive ferromagnetic ordering at T_C=100 K. The magnetic properties are highly anisotropic, reflecting the crystal structure. An easy-axis of magnetization is found to be the [001] direction (c-axis) both in the antiferromagnetic and ferromagnetic phases, while the [100] direction (a-axis) corresponds to the hard-axis in magnetization. The magnetization curve in the antiferromagnetic phase indicates a clear metamagnetic transition at a low field of about 1 kOe and changes into a ferromagnetic magnetization curve below T_C=100 K. The saturation moment is determined as 1.75μ_B/U at 2 K. The electronic specific heat coefficient is also determined as 20 mJ/(K^2・mol).
社団法人日本物理学会の論文
2005-05-15