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Electron Spectrum and Dieleclric Susceptibility of the Hubbard Model with Local Lattice Anharmonicity

100%
Stasyuk I., Shvaika A.
Acta Physica Polonica A
|
1994
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vol. 85
|
issue 2
363-366
EN
The investigation of single-electron spectrum of the Hubbard model with local lattice anharmonicity is performed. The influence of the interaction with the vibrational subsystem on the effective exchange constant is considered. The static transverse dielectric susceptibility of the model is calculated. Analysis of the possible dielectric anomalies is performed on this basis.
2
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Dielectric Properties and Electron Spectrum of the Müller Model in the High-Temperature Superconductivity Theory

100%
Stasyuk I., Shvaika A.
Acta Physica Polonica A
|
1993
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vol. 84
|
issue 2
293-313
EN
The paper is devoted to the investigation of the single-electron excitation spectrum, effective exchange interaction and dielectric susceptibility of the Muller model for high-temperature superconductivity. It is shown that the interaction with the anharmonic vibration mode leads to the additional splitting of the electron bands and their narrowing. The sign of the effective exchange interaction between electrons depends on the local state of the vibration subsystem. The electron and pseudospin (lattice) contributions to the transverse dielectric susceptibility are investigated.
3
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Thermodynamics of Pseudospin-Electron Model in the U=0 Limit

81%
Stasyuk I., Shvaika A., Tabunshchyk K.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 3
411-414
EN
Analytical consideration of a pseudospin-electron model in the absence of electron correlations is presented. Pseudospin and electron number mean values, thermodynamic potential, pair correlation functions are obtained in the same self-consistent approximation. The possibility of either first or second order phase transitions between different uniform phases (bistability) as well as between the uniform and the chessboard one is shown. In the regime n=const, an instability with respect to phase separation can take place.
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