Abstract
The Anderson model of localized magnetic states in metals is extended to a system containing a vacancy and an impurity atom. The interaction between the vacancy and the impurity atom mediated by conduction electrons is investigated by the application of the Nagaoka's decoupling procedure of the double time Green functions. It is shown that the interaction is of the Ruderman-Kittel type for large separation of the impurity atom and the vacancy. The magnitude of an interaction energy of a vacancy with a transition metal impurity in dilute copper alloys is estimated to be -0.192-0.338 eV for the nearest neighbour pair. These values favourably compare with the measured ones deduced from the impurity diffusion experiments.
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