Effect of high-temperature heat-treatment on the pinning properties of melt-textured Nd123

被引：36

作者：

Chikumoto, N ^{[1
]}

Yoshioka, J ^{[1
]}

Otsuka, M ^{[1
]}

Hayashi, N ^{[1
]}

Murakami, M ^{[1
]}

机构：

[1] SHIBAURA INST TECHNOL,MINATO KU,TOKYO 105,JAPAN

来源：

PHYSICA C | 1997年 / 281卷 / 2-3期

关键词：

NdBa2Cu3O7-delta; melt-texture; high-temperature annealing; flux pinning; superconducting transition; peak effect;

D O I：

10.1016/S0921-4534(97)01454-8

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have investigated the effect of high-temperature annealing on the superconducting transition and the flux pinning properties of Nd123 melt-textured in 1% O-2-Ar. After the high-temperature annealing, a decrease in J(c) was observed in most samples even though no appreciable change was observed in T-c. TEM observations and EDX analysis show that the spatial variation of the Nd/Ba ratio almost disappears after high-temperature annealing. Therefore, the observed change in J(c)-B properties can be understood by a reduction in the field-induced pinning due to homogenization of Nd/Ba substitution regions. These results strongly support the idea that the secondary peak effect and high pinning performance in Nd123 can be ascribed to the presence of Nd/Ba spatial variation. (C) 1997 Elsevier Science B.V.

引用

页码：253 / 259

页数：7

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