Abstract

Magnetic properties of ZrZn 2 alloys with Ti and Hf are investigated by making use of the Wolff-Clogston model extended to the case of many impurities in the self-consistent Hartree-Fock approximation. The self-consistent equations for Green's function in the magnetic case are derived, by using the result obtained by the graphic method for a disordered system. They are solved explicitly in lower concentrations up to the second-order terms with respect to the impurity potential and the difference between intra-atomic Coulomb integrals at an impurity and a host sites. By the solution corresponding to the Stoner model for a virtual crystal, the experimental results of the spontaneous magnetization, Curie temperature and spin susceptibilities of (Zr 1- x Ti x )Zn 2 and (Zr 1- x Hf x )Zn 2 alloys are explained satisfactorily. The correction to the solution for a virtual crystal is estimated to be small. It is concluded that the difference between magnetic properties of these alloys can be explained by the chan...

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