Magnetic Properties of (Zr_<1-x>Ti_x)Zn_2 and (Zr_<1-x>Hf_x)Zn_2 Alloys

概要

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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 change of the intra-atomic Coulomb integrals in Zr and Ti of Hf atoms.
社団法人日本物理学会の論文
1971-09-05