Superconductivity in a Hubbard-Fröhlich model and in cuprates

T. M. Hardy, J. P. Hague, J. H. Samson, and A. S. Alexandrov
Phys. Rev. B 79, 212501 – Published 2 June 2009

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.

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  • Received 3 February 2009

DOI:https://doi.org/10.1103/PhysRevB.79.212501

©2009 American Physical Society

Authors & Affiliations

T. M. Hardy1, J. P. Hague1,2, J. H. Samson1, and A. S. Alexandrov1

  • 1Department of Physics, Loughborough University, Loughborough LE11 3TU, United Kingdom
  • 2Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA, United Kingdom

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Issue

Vol. 79, Iss. 21 — 1 June 2009

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