AC INDUCTANCE MEASUREMENTS OF HIGH-TEMPERATURE SUPERCONDUCTOR THIN-FILMS IN DC MAGNETIC-FIELDS

被引：2
|
作者：
FLIPPEN, RB
FINCHER, CR
FACE, DW
HOLSTEIN, WL
机构：
[1] Central research and Development E.I. du Pont de Nemours, Co., Inc., Wilmington
来源：
PHYSICA C | 1992年 / 193卷 / 1-2期
关键词：
Oxide Superconductors - Thallium Barium Calcium Copper Oxides - Yttrium Barium Copper Oxides;
D O I：
10.1016/0921-4534(92)90881-C
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
An AC inductance technique combined with a variable DC magnetic field has been used to measure at 77 K the flux exclusion properties of thin films of the high-temperature superconductors YBa2Cu3O7-x and Tl2Ba2CaCu2O8, prepared by coevaporation, in situ off-axis sputtering, or laser ablation. These results are compared to those for single crystal YBa2Cu3O7-x. A decrease in flux exclusion with applied DC field is seen for all samples, most strongly for Tl2Ba2CaCu2O8 films. The change in flux exclusion with magnetic field varies widely for YBa2Cu3O7-x samples, with some laser-ablated films showing less change in flux exclusion with magnetic field than single crystal YBa2Cu3O7-x. These results are interpreted in terms of magnetic field penetration through crystalline structures and grain boundaries in these materials.
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页码：145 / 153
页数：9
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