Anisotropy of the penetration depth in YBa2Cu3O7-delta: Josephson-tunneling studies

被引:34
作者
Sun, AG
Han, SH
Katz, AS
Gajewski, DA
Maple, MB
Dynes, RC
机构
[1] Department of Physics, University of California, San Diego, San Diego
来源
PHYSICAL REVIEW B | 1995年 / 52卷 / 22期
关键词
D O I
10.1103/PhysRevB.52.R15731
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The modulation of the Josephson critical current between two superconductors in a magnetic field provides a direct, low-field dc measurement of the penetration depth of the two superconductors. To measure the in-plane penetration depth anisotropy of YBa2Cu3O7-delta, we have fabricated low leakage Pb/Insulator/YBa2Cu3O7-delta tunnel junctions on detwinned YBa2Cu3O7-delta single crystals with tunneling along the c axis. By applying the magnetic field along the b and a crystalline axes of YB(a)2Cu(3)O(7-delta) lambda(a) and b are extracted from the respective field modulation patterns. We find a large anisotropy [(lambda(a)/lambda(b))(2) greater than or equal to 2] of the penetration depths along the a and b axes.
引用
收藏
页码:15731 / 15733
页数:3
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