An Application of the Coherent Potential Approximation to Substitutionally Disordered Heisenberg Antiferromagnets
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概要
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It is shown that the coherent potential approximation (CPA) can be applied straight-forwardly to a substitutionally disordered binary Heisenberg antiferromagnet under the conditions of J^(f)_<AA>S_A= J^(f)_<AB>S_B and J^(f)_<BA>S_A= J^(f)_<BB>S_B, where J^(f)_<AA>,J^(f)_<AB> and J^(f)_<BB> are the f-th neighboring exchange integrals between two A, one A and one B, and two B constituent magnetic ions, respectively, and S_A and S_B are respectively the spin magnitudes of the A and B ions. The present theory not only satisfies the Goldstone theorem but also reproduces in the low concentrarion limit the theretical results for the single impurity problem. Various properties of magnetic excitations in the disordered antiferromagnet are calculated on the basis of the CPA. Numerical evaluations are performed for the K(Mn,Co)F_3 system. The results for the dispersion relations of magnetic excitations are in good agreement with the recent neutron inelastic scattering data of Buyers et al. for KMn_<0.8>Co_<0.2>F_3 and KMn_<0.29>Co_<0.71>F_3.
- 理論物理学刊行会の論文
- 1974-05-25
著者
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Tonegawa Takashi
Department Of Earth And Environmental Sciences Graduate School Of Environmental Studies Nagoya Unive
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Tonegawa Takashi
Department Of Physics Fuculty Of Science Kobe University
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TONEGAWA Takashi
Department of Physics, Fuculty of Science, Kobe University
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