Time relaxation of persistent currents in YBa2Cu3O7-x crystals with columnar defects

被引：21

作者：

Civale, L ^{[1
]}

Pasquini, G ^{[1
]}

Levy, P ^{[1
]}

Nieva, G ^{[1
]}

Casa, D ^{[1
]}

Lanza, H ^{[1
]}

机构：

[1] COMIS NACL ENERGIA ATOM,DEPT FIS,RA-1429 BUENOS AIRES,DF,ARGENTINA

来源：

PHYSICA C | 1996年 / 263卷 / 1-4期

关键词：

D O I：

10.1016/0921-4534(95)00782-2

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have measured the persistent currents and their time relaxation in YBa2Cu3O7-x, single crystals with correlated disorder introduced by irradiation with high-energy heavy-ions. For vortex density lower than the defect density, and for applied fields either parallel or nonparallel to the columnar defects, we find clear evidence of a pinning-crossover between a regime of strong individual pinning at low temperatures and a regime of weaker collective pinning at high temperatures. We explore the vortex dynamics above and below this crossover.

引用

页码：389 / 395

页数：7

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