Impurity Effects on Two-Dimensional Anisotropic Heisenberg Antiferromagnets.

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  • Kawashima Takashi
    Department of Physics, Dokkyo University School of Medicine, Mibu, Tochigi 321–02
  • Oguchi Akihide
    Department of Physics, Faculty of Science and Technology, Science University of Tokyo, Noda, Chiba 278

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  • Impurity Effects on Two Dimensional Ani

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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 Jp(z)/Jp(xy) is enhanced with increasing nonmagnetic impurities, where Jp(z) and Jp(xy) 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 Néel temperature and the magnitude of the coherent exchange constant are calculated as a function of the impurity concentration.

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