Abstract
A self-consistent perturbation theory is applied to a model hamiltonian for the half-metallic ferromagnetic compound NiMnSb and the finite-temperature properties of the compound are studied. A half-metallic ferromagnetic state at low temperatures and a continuous transition to a paramagnetic state are successfully obtained. The half-metallic state is found to cross over to a conventional ferromagnetic state due to the shift of the chemical potential when the spontaneous magnetization is still large. It is found that the non-quasiparticle states caused by the correlation effect contribute to the depolarization around the chemical potential, but that more significant depolarization is caused by the crossover to a conventional ferromagnetic state.
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