The Origin of Tc Enhancement in Heterostructure Cuprate Superconductors

被引：11
作者：
Bergman, Doron L. [1 ]
Pereg-Barnea, Tamar [1 ,2 ]
机构：
[1] CALTECH, Dept Phys, Pasadena, CA 91125 USA
[2] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
来源：
MATERIALS | 2011年 / 4卷 / 10期
关键词：
high T-c superconductivity; heterostructures; cuprates;
D O I：
10.3390/ma4101835
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Recent experiments on heterostructures composed of two or more films of cuprate superconductors of different oxygen doping levels have shown a remarkable T-c enhancement (up to 50%) relative to single compound films. We provide a simple explanation of the enhancement which arises naturally from a collection of experimental works. We show that the enhancement could be caused by a structural change in the lattice, namely an increase in the distance of the apical oxygen from the copper-oxygen plane. This increase modifies the effective off-site interaction in the plane which in turn enhances the d-wave superconductivity order parameter. To illustrate this point we study the extended Hubbard model using the fluctuation exchange approximation.
引用
收藏
页码：1835 / 1845
页数：11
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