A New Cluster Approximation to the Diluted Ising and Heisenberg Ferromagnets
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概要
- 論文の詳細を見る
A new cluster approximation which enables us to describe both the diluted Ising and Heisenberg spin systems quantitatively is proposed. This approximation is based upon a cluster expansion formula for the magnetization and density matrices obtained by introducing stochastic variables. It is systematically improved by expanding the size of clusters to be considered. The 1-, 2-, and 3-site approximations are applied to the diluted ferromagnets with the nearest-neighbor interaction. Concentration dependence of the Curie temperature for the Heisenberg model is quite different from that for the Ising model, while values of the critical concentration for these two models are almost the same. Dependence of the thermal average of a spin variable on its local environment is also studied.
- 理論物理学刊行会の論文
- 1977-06-25
著者
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Mano Hiroshi
Department Of Agricultural Chemistry Faculty Of Agriculture Tokyo University Of Agriculture
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Mano Hiroshi
Department Of Physics Osaka University
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MANO Hiroshi
Department of Physics, Gakushuin University
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MANO Hiroshi
Department of Physics, Osaka University
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