Coherent-Potential Approximation for Disordered Ferromagnetic Binary Alloys
- 1 January 1972
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 5 (1), 98-101
- https://doi.org/10.1103/physrevb.5.98
Abstract
The magnetic properties of spin-½ Heisenberg ferromagnetic alloys are calculated. We calculate the spin-wave Green's function in the random-phase approximation and treat the disordered composition-dependent exchange interaction in a coherent-potential approximation (CPA). In the weak-scattering limit, the CPA reproduces the result of the mean-field theory as expected, and in the strong-scattering limit, the CPA predicts such properties as critical concentration, which is beyond the scope of the mean-field theory.Keywords
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