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Van Hove singularities and nonadiabatic effects in superconductivity

1996; Institute of Physics; Volume: 36; Issue: 8 Linguagem: Inglês

10.1209/epl/i1996-00277-9

1286-4854

E. Cappelluti, L. Pietronero,

Advanced Chemical Physics Studies

The breakdown of Migdal's theorem implies the generalization of the electron-phonon theory of superconductivity to include various nonadiabatic effects. The reduced electronic screening due to the small carrier density and the presence of a van Hove singularity for the optimized cuprates complete a new scenario for both the superconductive and the normal state. In particular the van Hove singularity can be related to highest values of Tc, to the reduction of the isotope effect and to the linear resistivity.