CPA treatment of the extended Hubbard model

Abstract

Abstract The Hamiltonian for a completely degenerate d‐band including intra‐atomic Coulomb and exchange interactions is studied using the two‐sublattice alloy analogy method. The density of states and the criterion for the appearance of antiferromagnetism are calculated by this method. At the transition from paramagnetism to antiferromagnetism the energy gap appears. The interaction constant required to produce antiferromagnetism tends to zero at the maxima of the state density function.