Abstract
The extended Falicov-Kimball model is applied to a cluster composed of three spinless ions. By one of these ions we simulate an interstitial impurity situation which often occurs in semiconducting SmS. The remaining two ions are taken as next nearest neighbours sitting on regular Sm lattice sites. For a proper choice of parameters these two ions may undergo a valence transition due to the presence of the impurity. The situation corresponding to an anionic impurity can be simulated in a similar way.
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