Field-induced pinning effect of Nd(Ba1-xNdx)(2)Cu3O7-delta single crystal grown by the traveling-solvent floating-zone method

被引：30
|
作者：
Egi, T
Wen, JG
Kuroda, K
Mori, H
Unoki, H
Koshizuka, N
机构：
[1] Super. Conduct. Research Laboratory, Intl. Super. Conduct. Technol. Ctr., Tokyo, 135, 10-13 Shinonome 1-chome, Koto-ku
来源：
PHYSICA C | 1996年 / 270卷 / 3-4期
关键词：
NdBa2Cu3O7-delta single crystal; peak effect; pinning center; high critical current density; substitution;
D O I：
10.1016/S0921-4534(96)00483-2
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have studied the superconducting properties of Nd(Ba1-xNdx)(2)Cu3O7-delta (Nd123, x approximate to 0.1) single crystals grown by the traveling-solvent floating-zone method under 0.1% O-2 in Ar atmosphere. The enhancement of the magnetization with increasing field is observed in the hysteresis (M-H) loop in fields both parallel and perpendicular to the c-axis of the Nd123 single crystals as well as in the bulk crystals prepared by the oxygen-controlled-melt-growth (OCMG) method. The composition variation of Ba/Nd is observed in the matrix of Nd123 crystals by an analytical TEM equipped with a cold field-emission gun. It turns out that the enhancement is due to the field-induced pinning effect ascribed to the weak superconducting Nd-Ba substitution regions in the Nd123 matrix.
引用
收藏
页码：223 / 230
页数：8
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