Well-defined grain boundary weak-links in silver-sheathed (Tl0.78Bi0.22)(Sr0.8Ba0.2)(2)Ca2Cu3Ox tape conductors

被引：7

作者：

Everett, J ^{[1
]}

Dhalle, M ^{[1
]}

Johnston, MD ^{[1
]}

Caplin, AD ^{[1
]}

Moore, JC ^{[1
]}

Fox, S ^{[1
]}

Hyland, D ^{[1
]}

Grovenor, CRM ^{[1
]}

机构：

[1] UNIV OXFORD,DEPT MAT,OXFORD OX1 3PH,ENGLAND

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 1996年 / 9卷 / 12期

关键词：

D O I：

10.1088/0953-2048/9/12/010

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The key factors that make the thallium-based 1223 phase conductors attractive candidates for high-field applications at 77 K are a high transition temperature (about 115 K) and an irreversibility line comparable to that of YBa2Cu3O7. However, a third important factor is the grain boundary behaviour. We have performed detailed current-voltage (I-V) studies of a silver-sheathed (Tl0.78Bi0.22)(Sr0.8Ba0.2)(2)Ca2Cu3Ox (Tl-1223/Ag) tape. Although the tape has a fairly high self-field critical current density J(c) at 77 K (about 5 x 10(3) A cm(-2)), the I-V characteristics display the 'weak-link' signatures well known for YBa2Cu3O7: linear dissipation above a sharply defined critical current, a pronounced decrease of J(c) in a magnetic field H and hysteresis with respect to field cycling. Broader implications for the superconductive behaviour of HTS grain boundaries are discussed.

引用

页码：1077 / 1080

页数：4

共 31 条

[1] EVIDENCE FOR LOCAL COMPOSITION VARIATIONS WITHIN YBA2CU3O7-DELTA GRAIN-BOUNDARIES [J].