Abstract
We present a simple, but very realistic, model for a description of pressure induced valence and metal-insulator transitions in mixed valence systems. It is based on the extended Falicov-Kimball model and the supposition that the key interaction governing these transitions is the nonlocal hybridization between the localized f and itinerant d electrons. Taking into account, in addition, the parametrization between the external pressure and the d − f hybridization (the experimental fact), the model is able to describe, at least qualitatively, valence as well as metal-insulator transitions driven by the external pressure observed experimentally in some rare-earth systems, like SmB6.
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