Dielectric instabilities and phase transitions in pseudospin-electron model of HTSC system
The possible dielectric instabilities and phase transitions in high-Tc superconductors are analyzed within the pseudospin-electron model involving Hubbard type electron correlations as well as their interaction with local an-harmonic vibrational modes. The calculation of the dynamic dielectric susce...
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| Date: | 1996 |
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| Main Author: | |
| Format: | Article |
| Language: | English |
| Published: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
1996
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| Series: | Физика низких температур |
| Subjects: | |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Dielectric instabilities and phase transitions in pseudospin-electron model of HTSC system / I.V. Stasyuk, A.M. Shvaika // Физика низких температур. — 1996. — Т. 22, № 5. — С. 535-538. — Бібліогр.: 14 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | The possible dielectric instabilities and phase transitions in high-Tc superconductors are analyzed within the pseudospin-electron model involving Hubbard type electron correlations as well as their interaction with local an-harmonic vibrational modes. The calculation of the dynamic dielectric susceptibility χ(ω, q) is performed in the generalized random phase approximation. The instabilities with respect to the polarization and/or charge fluctuations are obtained from the temperature dependences of χ(ω, q). The behavior of low-frequency modes in the vicinity of these instabilities is investigated. The case of the infinity narrow electron band is considered in details. |
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