Poor screening and nonadiabatic superconductivity in correlated systems

Abstract

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.

12 Pages, 6 Figures, Accepted on Physical Review B

References in corpus (4)

• Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors
• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Anomalous Dispersion of Longitudinal Optical Phonons in $\mathbf{N}{\mathbf{d}}_{1.86}\mathbf{C}{\mathbf{e}}_{0.14}\mathbf{Cu}{\mathbf{O}}_{4+\mathbf{\delta }}$ Determined by Inelastic X-ray Scattering
• Nonadiabatic Pauli susceptibility in fullerene compounds

Cited by in corpus (4)

• Imaging nano-scale electronic inhomogeneity in lightly doped Mott insulator Ca_{2-x}Na_{x}CuO_{2}Cl_{2}
• Full-bandwidth Eliashberg theory of superconductivity beyond Migdal's approximation
• Influence of phonon renormalization in Eliashberg theory for superconductivity in 2D and 3D systems
• Transport properties in correlated systems: An analytical model