Localized magnetic moments in dilute metallic alloys: correlation effects

Journal ArticleWe discuss qualitatively the importance of the correlation energy in determining the ground state of a metal with an impurity atom. For a single, partly occupied impurity Estate orbital, the correlation energy acts to prevent the appearance of a nonvanishing ground-state spin, so that this simple nondegenerate model actually has a complicated structure. In one dimension, we show that this model of an impurity can never lead to a localized moment