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Superconductivity in a Hubbard-Froehlich Model and in cuprates | | T. M. Hardy
; J. P. Hague
; J. H. Samson
; A. S. Alexandrov
; | | Date: |
17 Jun 2008 | | Abstract: | 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. | | Source: | arXiv, 0806.2810 | | Services: | Forum | Review | PDF | Favorites | |
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