Screening effects in superconductors

被引：9

作者：

Capezzali, M ^{[1
]}

Ariosa, D ^{[1
]}

Beck, H ^{[1
]}

机构：

[1] IBM CORP,DIV RES,CH-8803 RUSCHLIKON,ZH,SWITZERLAND

来源：

PHYSICA B | 1997年 / 230卷

关键词：

Coulomb interaction; phase diagram; phase dynamics;

D O I：

10.1016/S0921-4526(96)00712-0

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The partition function of the Hubbard model with local attraction and long-range Coulomb repulsion between electrons is written as a functional integral with an action A involving a pairing field Delta and a local potential V. After integration over V and over fluctuations in \Delta\(2), the final form of A involves a Josephson coupling between the local phases of Delta and a ''kinetic energy'' term, representing the screened Coulomb interaction between charge fluctuations. The competition between Josephson coupling and charging energy allows to understand the relation between T-C and composition in high-T-C materials, in particular superlattices, alloys and bulk systems of low doping.

引用

页码：962 / 965

页数：4

共 19 条

[1] Phase fluctuations of the superconducting order parameter in high-Tc systems [J].