Abstract
An expression for the density of states of two electronic bands with intraand inter-band correlations has been derived. The consequences of the inter-band interaction on Mott-Hubbard split bands are discussed. The model is applied to explain the metal, semi-metal and magnetic phase transitions in NiS by using a semi-elliptical form for the density of states of non-interacting electrons. It is shown that the temperature-dependent overlap and hybridization parameters between d- and p-bands can provoke both the phase transitions in NiS as pointed out earlier by White & Mott (1971)
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