1996 年 65 巻 8 号 p. 2374-2376
High-field magnetization of two hexagonal layered compounds RbFe(MoO_4)_2 and CsFe(SO_4)_2 is measured. In the magnetization curves of both compounds, a plateau-like structure with one-third of the saturated moment is observed. This anomaly is analyzed in terms of the magnetization process of a two-dimensional triangular lattice Heisenberg antiferromagnet with weak Ising-type anisotropy.
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