Poor screening and nonadiabatic superconductivity in correlated systems

被引：7

作者：

Boeri, L

Cappelluti, E

Grimaldi, C

Pietronero, L

机构：

[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[2] INFM, UdR RM1, Rome, Italy

[3] Enrico Fermi Ctr, I-00184 Rome, Italy

[4] Ecole Polytech Fed Lausanne, LPM, Inst Prod & Robot, CH-1015 Lausanne, Switzerland

[5] CNR, Ist Acust OM Corbino, I-00133 Rome, Italy

来源：

PHYSICAL REVIEW B | 2003年 / 68卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.68.214514

中图分类号：

T [工业技术];

学科分类号：

08 ;

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.

引用

页数：12