Superconductivity in a Hubbard-Froehlich Model and in cuprates

Details Superconductivity in a Hubbard-Froehlich Model and in cuprates Superconductivity in a Hubbard-Froehlich Model and in cuprates

2008-06-17

arxiv.org/abs/0806.2810v1

Phys. Rev. B, Vol. 79, 212501 (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.79.212501

Using the variational Monte-Carlo method we find that a relatively weak long-range electron-phonon interaction induces a d-wave superconducting state of 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, removing the requirement for additional mechanisms such as spin fluctuations to mediate d-wave superconductivity. We argue that the superconducting state is robust with respect to a more intricate choice of the trial function and that the true origin of high-temperature superconductivity lies in a proper combination of strong electron-electron correlations with poorly screened Froehlich electron-phonon interaction.

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