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Title: Superconductivity in a Hubbard-Frohlich model and in cuprates
Authors: Hardy, Thomas M.
Hague, J.P.
Samson, J.H.
Alexandrov, A.S.
Keywords: Electron-phonon interactions
Fluctuations in superconductors
High-temperature superconductors
Hubbard model
Monte Carlo methods
Spin fluctuations
Wave functions
Issue Date: 2009
Publisher: © American Physical Society
Citation: HARDY, T.M. ... et al, 2009. Superconductivity in a Hubbard-Frohlich model and in cuprates. Physical Review B, 79, 212501, pp.1-4.
Abstract: Using the variational Monte Carlo method, we find that a relatively weak long-range electron-phonon interaction induces a d-wave superconducting state in doped Mott-Hubbard insulators and/or strongly correlated metals with a condensation energy significantly larger than can be obtained with Coulomb repulsion only. Moreover, the superconductivity is shown to exist for infinite on-site Coulomb repulsion without the need for additional mechanisms such as spin fluctuations to mediate d-wave superconductivity. We argue that our superconducting state is robust with respect to a more intricate choice of the trial-wave function and that a possible origin of high-temperature superconductivity lies in a proper combination of strong electron-electron correlations with poorly screened Fröhlich electron-phonon interaction.
Description: This article has been published in the journal, Physical Review B [© American Physical Society]. It is also available at: http://link.aps.org/doi/10.1103/PhysRevB.79.212501
Version: Published
DOI: 10.1103/PhysRevB.79.212501
URI: https://dspace.lboro.ac.uk/2134/5104
ISSN: 1098-0121
Appears in Collections:Published Articles (Physics)

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