Perturbation Theory of the Asymmetric Anderson Model

Abstract

The asymmetric Anderson model in the case of E_d=0 with infinite U is investigated by using the perturbation theory which treats the mixing term as the perturbation. The impurity susceptibility, the impurity specific heat and the d-electron number are studied within the most and the next divergent approximations. It is shown that the most divergent approximation is equivalent to the scaling theory. The range of validity and the nature of the present approach are also discussed.