Volume 100, Number 1, October 2012
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||17 October 2012|
High-temperature superconductivity from realistic Coulomb and Fröhlich interactions
1 Instituto de Fisica “Gleb Wataghin”, Universidade Estadual de Campinas - UNICAMP 13083-970, Campinas, São Paulo, Brasil
2 Department of Physics, Loughborough University - Loughborough LE11 3TU, UK, EU
3 Dipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno - I-84084 Fisciano (SA), Italy, EU
Received: 23 July 2012
Accepted: 13 September 2012
In recent years ample experimental evidence has shown that charge carriers in high-temperature superconductors are strongly correlated but also coupled with lattice vibrations (phonons), signalling that the true origin of high-Tc superconductivity can only be found in a proper combination of Coulomb and electron-phonon interactions. On this basis, we propose and study a model for high-Tc superconductivity which accounts for realistic Coulomb repulsion, strong electron-phonon (Fröhlich) interaction and residual on-site (Hubbard-) correlations without any ad hoc assumptions on their relative strength and interaction range. In the framework of this model, which exhibits a phase transition to a superconducting state with a critical temperature Tc well in excess of 100 K, we emphasize the role of as the driving parameter for a BEC/BCS crossover. Our model lays a microscopic foundation for the polaron-bipolaron theory of superconductivity. We argue that the high-Tc phenomenon originates in competing Coulomb and Fröhlich interactions beyond the conventional BCS description.
PACS: 74.20.-z – Theories and models of superconducting state / 74.72.-h – Cuprate superconductors / 71.38.-k – Polarons and electron-phonon interactions
© EPLA, 2012
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