Superconductor-to-metal quantum phase transition in overdoped La2-xSrxCuO4

被引：43
作者：
Lemberger, T. R. [1 ]
Hetel, I. [1 ]
Tsukada, A. [2 ]
Naito, M. [2 ]
Randeria, M. [1 ]
机构：
[1] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA
[2] Tokyo Univ Agr & Technol, Tokyo, Japan
来源：
PHYSICAL REVIEW B | 2011年 / 83卷 / 14期
基金：
美国国家科学基金会;
关键词：
SUPERFLUID DENSITY; PENETRATION DEPTH; THIN-FILMS; CUPRATE SUPERCONDUCTORS; 2-DIMENSIONAL SYSTEMS; 2-COIL APPARATUS; TL2BA2CUO6+DELTA; TEMPERATURE; BEHAVIOR; STRAIN;
D O I：
10.1103/PhysRevB.83.140507
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We investigate T-c and magnetic penetration depth lambda(T) near the superconductor-metal quantum phase transition in overdoped La2-xSrxCuO4 films. Both T-c and superfluid density n(s), alpha lambda(-2), decrease with overdoping. They obey the scaling relation T-c alpha [lambda(-2)(0)](alpha) with alpha approximate to 1/2. We discuss this result in the frameworks of disordered d-wave superconductors and of scaling near quantum critical points. Our result, and the linear scaling (alpha approximate to 1) found for the more anisotropic Tl2Ba2CuO6+delta, can both be understood in terms of quantum critical scaling, with different dimensionalities for fluctuations.
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页数：4
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