INTERACTION EFFECTS IN DILUTE MAGNETIC ALLOYS

In this paper, the influence of interaction between magnetic impurity ions on the Kondo effect is treated by using Green's function method under the condition Tk (Kondo temperature). A self-consistent-field approximation for s-d exchange Hamil-tonian is adopted. Both of the two types of the decoupling terms, which are responsible for single-ion Kondo effect and inter-ionic interaction respectively, are retained. The Kondo temperature and the low-temperature resistivity for impurity system have been calculated. The results indicate that in dilute magnetic alloys interaction effects will decrease Tk and make the ρ-T curve in the region T《 Tk changes from 1-AT2 to 1 + BT2, with A,B > 0. Thus a resistivity maximum may probably be observed in the temperature region T k.