Improved strong magnetic field performance of low angle grain boundaries of calcium and oxygen overdoped YBa2Cu3Ox

被引：71

作者：

Daniels, GA

Gurevich, A

Larbalestier, DC

机构：

[1] Univ Wisconsin, Ctr Appl Superconduct, Madison, WI 53706 USA

[2] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA

来源：

APPLIED PHYSICS LETTERS | 2000年 / 77卷 / 20期

关键词：

D O I：

10.1063/1.1322053

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Critical currents and extended voltage-current characteristics of [001] tilt, low angle boundaries in thin film bicrystals of pure YBa2Cu3Ox and Y0.7Ca0.3Ba2Cu3Ox in strong magnetic fields (H < 10 T) have been measured. For 5 degrees [001] tilt boundaries, there are clear benefits to Ca additions, particularly when the sample is oxygen treated to further overdope the sample after growth. Ca-doping decreases excess grain boundary resistance and diminishes the gap between inter- and intragrain current density over a wide field and temperature range. In spite of the lower T-c of the 0.3 Ca-doped samples, Ca doping increases the intergrain critical current density at 44 K as high as 30% over 0-3 T and threefold at 5 T. (C) 2000 American Institute of Physics. [S0003-6951(00)03644-5].

引用

页码：3251 / 3253

页数：3

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