Abstract
Within the alloy analogy approximation it is shown that the disordered local moments (DLM) can be formed inside the degenerate d band. The Coulomb correlation, if sufficiently strong, produces two sub-bands, in which the DLM phase can appear. The temperature-dependent susceptibility in the Hubbard model is obtained and the temperature stability of different phases discussed. The results of the Stoner model for susceptibility versus temperature dependence are critically evaluated. It is shown that the Curie-Weiss law holds only in very small regions around the band edges. From the zeros of the susceptibility denominator the transition temperatures between either ferromagnetic, antiferromagnetic or DLM phases and the paramagnetic phase are obtained. It is shown that the DLM phase is stable high above the Curie temperature in ferromagnetic iron but is unlikely to be stable above the Neel temperature in antiferromagnetic chromium.
Published Version
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