Electrical and Magnetic Properties of CeAu_2Si_2(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

概要

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We succeeded in growing a high-quality single-crystal of CeAu_2Si_2, which was previously reported to be highly sample-dependent in terms of electrical and magnetic properties. CeAu_2Si_2 is not a simple AF1-type antiferromagnet, but reveals three antiferromagnetic transitions in a narrow temperature range from the Neel temperature T_<N1>=9.6K to T_<N3>=8.0K. A clear metamagnetic transition with two steps was observed at H_<c1>=53kOe and H_<c2>=55kOe in the magnetization curve below 5K for the magnetic field along an antiferromagnetic easy-axis, namely, the tetragonal [001] direction, with a saturation moment of 1.53μB/Ce. The magnetic susceptibility and magnetization are anisotropic, which are well explained by results of crystalline electric field analyses. We also studied the de Haas-van Alphen (dHvA) effect. The detected dHvA branches are found to be consistent with those of a non-4f reference compound such as YCu_2Si_2.
社団法人日本物理学会の論文
2009-03-15