Poor screening and nonadiabatic superconductivity in correlated systems

Article

关键词: ELECTRON-PHONON INTERACTION;    HIGH-TEMPERATURE SUPERCONDUCTORS;    T-C SUPERCONDUCTORS;    VERTEX CORRECTIONS;    MIGDALS THEOREM;    GAP ANISOTROPY;    D-WAVE;    TRANSITION;    BANDS;   

DOI  :  10.1103/PhysRevB.68.214514

来源: SCIE

【 摘 要 】

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.

【 授权许可】

Free