Abstract
A localized electron approach to the mixed configuration ground state is proposed. The model consists of highly correlated and localized f-electrons and d-electrons with a narrow band width, and includes f-d mixing interaction as well as f-d excitonic correlation. A variational wave function proposed by Kaplan et al. is used to exhibit the mixed-valence phenomena through f-d mixing. The pressure-induced phase transition of the samarium monochalcogenides is explained well by this model. Instability of the proposed insulating ground state against the creation of delocalized electron-hole pairs is also examined as a possible explanation of the small conductivity in the collapsed phase.
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