Impurity Effects on Two-Dimensional Anisotropic Heisenberg Antiferromagnets
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概要
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We study magnetic behavior of a completely random dilute S=1/2 anisotropic Heisenberg antiferromagnet on the two-dimensional square lattice by using the coherent potential approximation. In the anisotropic Heisenberg model, the xy-anisotropy defined by J^<(z)>_p/J^<(xy)>_p is enhanced with increasing nonmagnetic impurities, where J^<(z)>_p and J^<(xy)>_p are the z and xy components of the coherent exchange constant, respectively. On the other hand, the isotropic Heisenberg model retains the isotropic nature for any impurity concentration. The critical concentration at the percolation threshold is obtained. The Neel temperature and the magnitude of the coherent exchange constant are calculated as a function of the impurity concentration.
- 社団法人日本物理学会の論文
- 1994-05-15
著者
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Oguchi Akihide
Department Of Physics Faculty Of Sciece And Technology Science University Of Tokyo
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Kawashima Takashi
Department Of Applied Physics Faculty Of Engineering Tohoku Gakuin University
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KAWASHIMA Takashi
Department of Physics, Dokkyo University School of Medicine
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