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Title: High-temperature superconductivity from realistic Coulomb and Frohlich interactions
Authors: Alexandrov, A.S.
Samson, J.H.
Sica, G.
Issue Date: 2012
Publisher: © EPLA (Europhysics Letters Association)
Citation: ALEXANDROV, A.S., SAMSON, J.H. and SICA, G., 2012. High-temperature superconductivity from realistic Coulomb and Frohlich interactions. EPL (Europhysics Letters), 100 (1), 17011, 6pp.
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-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 (Frohlich) interaction and residual on-site (Hubbard ~U ) 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 100K, we emphasize the role of ~U 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 Frohlich interactions beyond the conventional BCS description.
Version: Accepted for publication
DOI: 10.1209/0295-5075/100/17011
URI: https://dspace.lboro.ac.uk/2134/11605
Publisher Link: http://dx.doi.org/10.1209/0295-5075/100/17011
ISSN: 0295-5075
Appears in Collections:Published Articles (Physics)

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