MgB2 films with very high critical current densities due to strong grain boundary pinning

被引：114

作者：

Kitaguchi, H

Matsumoto, A

Kumakura, H

Doi, T

Yamamoto, H

Saitoh, K

Sosiati, H

Hata, S

机构：

[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

[2] Kagoshima Univ, Fac Engn, Kagoshima 8900065, Japan

[3] Hitachi Ltd, Adv Res Lab, Kokubunji, Tokyo 1858601, Japan

[4] Kyushu Univ, Res Lab High Voltage Electron Microscopy, Fukuoka 8128581, Japan

[5] Kyushu Univ, Interdisciplinary Grad Sch Engn Sci, Kasuga, Fukuoka 8168580, Japan

来源：

APPLIED PHYSICS LETTERS | 2004年 / 85卷 / 14期

关键词：

D O I：

10.1063/1.1805195

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

MgB2 superconductor has a great potential for applications because of its high T-c and B-c2, exceeding those of any Nb-base superconductors at any temperature. It is now important to understand its flux pinning so as to raise J(c) to high values over a wide field range. We show that nanometer-sized columnar-grain structure can produce J(c) exceeding 5x10(6) A/cm(2). The angular dependence of J(c) indicates that the strongest pinning occurs when the field is aligned parallel to the grain boundaries. Our results confirm earlier deductions that grain boundaries in MgB2 act as effective pinning centers like those in Nb3Sn. (C) 2004 American Institute of Physics.

引用

页码：2842 / 2844

页数：3

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