EFFECTS OF STRONG COULOMB CORRELATIONS ON THE PHONON-MEDIATED SUPERCONDUCTIVITY - A MODEL INSPIRED BY COPPER OXIDES

被引：74

作者：

KIM, JH

TESANOVIC, Z

机构：

[1] Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 71卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.71.4218

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study how strong Coulomb correlations affect the phonon-mediated superconductivity. Using the Hubbard model representation of a strongly correlated system, we evaluate the Eliashberg electron-pair correlation function for different values of hole doping concentration, x. The pair interaction is repulsive near half filling (x=0), but it becomes attractive above some critical value of x, making the phonon-mediated superconductivity possible. We also compute the isotope effect coefficient.

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页码：4218 / 4221

页数：4

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