Abstract
The evolution of density of states and specific heat with band-filing and pressure changes has been investigated for asymmetric two-band periodic Anderson model. The equation of motion method for the irreducible Green functions with the extended Hubbard I approximation contributing to the appearance of “band-shifting” correction to the self-energy has been applied. It is shown that the energy spectrum varies between four- and five-band structures, while specific heat changes from one- to two-peak temperature dependencies, with the variation of parameters of the model. It is also revealed that the application of pressure can lead to the opening of the hybridization gap and subsequent metal–semiconductor–insulator transition.
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