We have succeeded in growing a high-quality single crystal of UCu 2Si2 with the tetragonal structure by the Sn-flux method and measured the electrical resistivity, magnetic susceptibility, magnetization and specific heat. UCu2Si2 is found to order antiferromagnetically below TN = 106 K, and follows a successive ferromagnetic ordering at TC = 100 K. The magnetic properties are highly anisotropic, reflecting the crystal structure. An easy-axis of magnetization is found to be the  direction (c-axis) both in the antiferromagnetic and ferromagnetic phases, while the  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 TC = 100 K. The saturation moment is determined as 1.75 μB/U at 2 K. The electronic specific heat coefficient is also determined as 20 mJ/(K2·mol).
ASJC Scopus subject areas
- Physics and Astronomy(all)