A survey of nonadiabatic superconductivity in cuprates and fullerides

Details A survey of nonadiabatic superconductivity in cuprates and fullerides A survey of nonadiabatic superconductivity in cuprates and fullerides

2000-06-21

arxiv.org/abs/cond-mat/0006325v3

Int. Journ. Mod. Phys. B 14, 2938 (2000)

Physics

Condensed Matter

Superconductivity

1 eps figure, ijmpb-macros, proceeding of SATT10, to appear on Int. Journ. Mod. Phys. B

Scientific paper

10.1142/S0217979200003137

High-$T_c$ superconductors are characterized by very low carrier densities. This feature leads to two fundamental consequences: on one hand the Fermi energies are correspondingly small and they can be of the same order of phonon frequencies. In such a situation nonadiabatic corrections arising from the breakdown of Migdal's theorem can not be longer neglected. In addition, small carrier densities imply poor screening and correlation effects have to be taken into account. We present a comprehensive overview of the theory of superconductivity generalized into the nonadiabatic regime which is qualitatively different from the conventional one. In this framework some of the observed properties of the cuprates and the fullerene compounds can be naturally accounted for, and a number of theoretical predictions are proposed that can be experimentally tested.

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