Abstract
We present a perturbative model for the electronic structure of a mixed-valent cation in a semiconducting Rare-Earth (RE) compound. We study local valence instabilities by considering the competition between the promotion energy of an electron into ‘d’ levels and the available shake-down energy which arises from the electronic relaxation around the ‘f’ hole; then we express local Intermediate Valence (IV) in terms of fd hybridization and local fd Coulombic interaction.
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