Magnetic penetration depth in superconducting La2-xSrxCuO4 films

被引：17

作者：

Paget, KM

Guha, S

Cieplak, MZ

Trofimov, IE

Turneaure, SJ

Lemberger, TR

机构：

[1] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[2] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08855 USA

[3] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[4] Polish Acad Sci, Inst Phys, Warsaw, Poland

来源：

PHYSICAL REVIEW B | 1999年 / 59卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.59.641

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have measured the magnetic penetration depth lambda(T) in a series of superconducting La2-xSrxCuO4 films with Sr concentrations from x = 0.135 to 0.175. lambda (-2)(T) - lambda (-2)(0) is quadratic in T for 0.4<T<10 K, which puts an upper limit of about 4 K on a possible isotropic gap. The larger magnitude of lambda(0), reduced T-C, and higher resistivity of films relative to bulk samples, plus the T-2 behavior of lambda (-2)(T)- lambda (-2)(0), lead naturally to the conclusion that superconductivity in La2-xSrxCuO4 is d wave. Near T-C the real part of the conductivity and lambda(T) are analyzed for critical behavior. The data indicate that the critical region is no wider than 1 K. [S0163-1829(98)02646-0].

引用

页码：641 / 646

页数：6

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