Physics – Condensed Matter – Superconductivity
Scientific paper
1998-05-05
Physics
Condensed Matter
Superconductivity
7 pages, 12 enclosed postscript figures. To appear on Phys. Rev. B
Scientific paper
10.1103/PhysRevB.58.5736
The nonadiabatic electron-phonon corrections for the superconducting pairing are investigated for a specific tight-binding model corresponding to a 2d square lattice. This permits to investigate the role of various specific properties like the band filling, nesting effects and a realistic van Hove singularity on the superconducting effective pairing beyond Migdal's limit. The main results are: (i) Starting from a momentum independent electron-phonon coupling the nonadiabatic effects lead to an effective pairing which is strongly dependent on frequency and momentum. (ii) If instead the electron-phonon coupling is mainly forward (as due to correlation effects) the resulting pairing results to be strongly enhanced. These results confirm but also extend the simplified scheme used up to now to compute these properties. In this respect our results link the nonadiabatic effects to the specific properties of realistic materials.
Grimaldi Claudio
Perali Andrea
Pietronero Luciano
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