Abstract
The intermediate valence problem presents a serious challenge to theorists. So far we understand well only the single intermediate valence impurity in a conduction band and the interactions between a pair of them. For the real problem, only qualitative ideas exist. After discussing the conditions in which intermediate valence comes about, I will discuss the single impurity and the pair interaction problems, draw qualitative conclusions about the lattice, point out the difficulties in the lattice problem and discuss some approximate treatments.
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Varma, C.M. (1984). Fundamentals of the Intermediate Valence Problem. In: Buyers, W.J.L. (eds) Moment Formation In Solids. NATO ASI Series, vol 117. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-1538-5_5
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