Thermodynamics of a pseudospin-electron model without correlations
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 approxim...
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| Datum: | 1999 |
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| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
Інститут фізики конденсованих систем НАН України
1999
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| Schriftenreihe: | Condensed Matter Physics |
| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/119913 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Thermodynamics of a pseudospin-electron model without correlations / I.V. Stasyuk, A.M. Shvaika, K.V. Tabunshchyk // Condensed Matter Physics. — 1999. — Т. 2, № 1(17). — С. 109-132. — Бібліогр.: 18 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | 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 µ = const regime to
the possibility of the first order phase transition at the temperature change
with the jump of the pseudospin mean value 〈Sz〉 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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