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|Type:||Artigo de periódico|
|Title:||High-temperature Superconductivity From Realistic Coulomb And Fröhlich Interactions|
|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 (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 T c well in excess of 100K, 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-T c phenomenon originates in competing Coulomb and Fröhlich interactions beyond the conventional BCS description. © Copyright EPLA, 2012.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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