INVESTIGATION OF INTERGRAIN AND INTRAGRAIN CRITICAL CURRENTS IN HIGH-TC CERAMIC SUPERCONDUCTORS

被引：144

作者：

KUPFER, H ^{[1
]}

APFELSTEDT, I ^{[1
]}

FLUKIGER, R ^{[1
]}

KELLER, C ^{[1
]}

MEIERHIRMER, R ^{[1
]}

RUNTSCH, B ^{[1
]}

TUROWSKI, A ^{[1
]}

WIECH, U ^{[1
]}

WOLF, T ^{[1
]}

机构：

[1] UNIV KARLSRUHE,D-7500 KARLSRUHE 1,FED REP GER

来源：

CRYOGENICS | 1988年 / 28卷 / 10期

关键词：

Ceramic Superconductors - High Temperature Superconductors - Intergrain Critical Currents - Intragrain Critical Currents - Oxide Superconductors;

D O I：

10.1016/0011-2275(88)90148-8

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Polycrystalline sintered bulk samples of REBa2Cu3O7 with RE = Y, Gd were studied by a.c. susceptibility and an inductive measurement technique which allows the separation of intergrain (transport) from intragrain critical current density. Field and temperature dependence of the intergrain current are compared with theoretical predictions for a weakly coupled grain structure. Up to fields 0.3 T the weak link character of the intergrain current predominates. At higher fields it changes and points to a percolation current via superconducting grain boundaries. A quantitative correlation between intragrain current and twin spacing is hidden, probably by oxygen deficiency in the grain interior. No variation of the intragrain critical current density with temperature is observed up to 85 K in a textured specimen.

引用

页码：650 / 660

页数：11

共 47 条

[1] TUNNELING BETWEEN SUPERCONDUCTORS [J].