THE EFFECT OF TWIN BOUNDARIES ON THE FLUX-PINNING IN MPMG PROCESSED YBCO

被引：18

作者：

FUJIMOTO, H ^{[1
]}

TAGUCHI, T ^{[1
]}

MURAKAMI, M ^{[1
]}

KOSHIZUKA, N ^{[1
]}

机构：

[1] ISTEC,SUPERCOND RES LAB,KOTO KU,TOKYO 135,JAPAN

来源：

PHYSICA C | 1993年 / 211卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(93)90146-H

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Using magnetic measurements we have investigated the effect of twin boundaries on flux pinning over the temperature range of 4.2 to 85 K in YBaCuO superconductors prepared by the melt-powder-melt-growth process (MPMG). It has been found that non-superconducting Y2BaCuO5 (211) particles dispersed in the 123 matrix can work as strong pinning centers, resulting in higher J(c) values. Despite non-superconducting 211 particles being the main pinning centers, defects such as twin boundaries, oxygen deficiency and stacking faults are also considered to be possible pinning centers in melt-processed YBCO. An enhancement of J(c) was observed when the magnetic field was applied parallel to the twin planes. The results indicate that twin planes contribute to flux pinning, but that their effect is not very large in MPMG processed samples.

引用

页码：393 / 403

页数：11

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