Thermodynamics of a pseudospin-electron model without correlations

Details Thermodynamics of a pseudospin-electron model without correlations Thermodynamics of a pseudospin-electron model without correlations

2000-06-07

arxiv.org/abs/cond-mat/0006100v1

Condens. Matter. Phys. vol. 2, No 1(17), 1999, p.109-132

Physics

Condensed Matter

Superconductivity

23 pages, 54 figures and diagrams

Scientific paper

Thermodynamics of a pseudospin-electron model without correlations is investigated. The correlation functions, the mean values of pseudospin and particle number, as well as the thermodynamic potential are calculated. The calculation is performed by a diagrammatic method in the mean field approximation. Single-particle Green functions are taken in the Hubbard-I approximation. The numerical research shows that an interaction between the electron and pseudospin subsystems leads in the $\mu={}$const regime to the possibility of the first order phase transition at the temperature change with the jump of the pseudospin mean value $$ and reconstruction of the electron spectrum. In the regime $n={}$const, an instability with respect to phase separation in the electron subsystem can take place for certain values of the model parameters.

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