Thermodynamic Properties of Ising-Like Heisenberg Antiferromagnets with Anisotropic Coupling on the Hexagonal Lattice
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概要
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Nature of ordered phases of Ising-like Heisenberg antiferromagnets on the hexagonal (layered triangular) lattice is investigated by making use of a Monte Carlo method and mean field analysis. Two phase transitions are found, which correspond to the orderings of the z-component and of the xy-components of the spins, respectively. The uniform magnetization along the easy axis is found in ordered phases with a concave curve as a function of the temperature and the spin configuration of the ordered phases is found to be a three-sublattice ferrimagnetic one. In the low temperature phase, the effect of the nontrivial degeneracy (NTD) of the ground state which is inherent to the present model is investigated. NTD causes a nontrivial enhancement of the fluctuation of the uniform magnetization in the hard plane. The magnetization processes in the ground state for fields along the x-axis are also studied.
- 社団法人日本物理学会の論文
- 1994-05-15
著者
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Miyashita Seiji
Graduate School of Human and Environmental Studies
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WATARAI Seizo
Faculty of Engineering,Setsunan University
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Watarai Seizo
Faculty Of Engineering Setsunan University
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Miyashita Seiji
Graduate School Of Human And Environmental Studies Kyoto University
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Watarai Seizo
Faculty of Engineering, Setsunan University
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