PhysicsRevB.79.212501.pdf (123.07 kB)
Superconductivity in a Hubbard-Frohlich model and in cuprates
journal contributionposted on 2009-08-06, 08:38 authored by Thomas M. Hardy, J.P. Hague, John Samson, A.S. Alexandrov
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.
CitationHARDY, T.M. ... et al, 2009. Superconductivity in a Hubbard-Frohlich model and in cuprates. Physical Review B, 79, 212501, pp.1-4.
Publisher© American Physical Society
- VoR (Version of Record)
NotesThis 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