Doping-induced enhancement of the critical currents of grain boundaries in YBa2Cu3O7-δ

被引：150

作者：

Schmehl, A ^{[1
]}

Goetz, B ^{[1
]}

Schulz, RR ^{[1
]}

Schneider, CW ^{[1
]}

Bielefeldt, H ^{[1
]}

Hilgenkamp, H ^{[1
]}

Mannhart, J ^{[1
]}

机构：

[1] Univ Augsburg, Inst Phys, Ctr Elect Correlat & Magnetism, D-86135 Augsburg, Germany

来源：

EUROPHYSICS LETTERS | 1999年 / 47卷 / 01期

关键词：

D O I：

10.1209/epl/i1999-00359-2

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The critical current density of grain boundaries in YBa2Cu3O7 - delta films is increased beyond the hitherto established limit by overdoping the superconductor. Using Ca-doping, values for the critical current density are obtained, that exceed the highest values reported ever for the undoped material by more than a factor of seven. Further, it is found that the overdoping strongly reduces the grain boundary normal-state resistivity. This systematic improvement of the grain boundary transport properties by doping is of great importance for applications of the high-T-c cuprates and gives insight into the mechanisms controlling the grain boundary behavior.

引用

页码：110 / 115

页数：6

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