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Type: Artigo de periódico
Title: High-temperature superconductivity from realistic Coulomb and Frohlich interactions
Author: Alexandrov, AS
Samson, JH
Sica, G
Abstract: 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-T-c 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-T-c superconductivity which accounts for realistic Coulomb repulsion, strong electron-phonon (Frohlich) interaction and residual on-site (Hubbard-(U) over tilde) 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 T-c well in excess of 100 K, we emphasize the role of (U) over tilde 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-T-c phenomenon originates in competing Coulomb and Frohlich interactions beyond the conventional BCS description. Copyright (C) EPLA, 2012
Country: França
Editor: Epl Association, European Physical Society
Rights: aberto
Identifier DOI: 10.1209/0295-5075/100/17011
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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