Poor screening and nonadiabatic superconductivity in correlated systems

Details Poor screening and nonadiabatic superconductivity in correlated systems Poor screening and nonadiabatic superconductivity in correlated systems

2003-11-12

arxiv.org/abs/cond-mat/0311281v1

Physics

Condensed Matter

Strongly Correlated Electrons

12 Pages, 6 Figures, Accepted on Physical Review B

Scientific paper

10.1103/PhysRevB.68.214514

In this paper we investigate the role of the electronic correlation on the hole doping dependence of electron-phonon and superconducting properties of cuprates. We introduce a simple analytical expression for the one-particle Green's function in the presence of electronic correlation and we evaluate the reduction of the screening properties as the electronic correlation increases by approaching half-filling. The poor screening properties play an important role within the context of the nonadiabatic theory of superconductivity. We show that a consistent inclusion of the reduced screening properties in the nonadiabatic theory can account in a natural way for the $T_c$-$\delta$ phase diagram of cuprates. Experimental evidences are also discussed.

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