Flux dynamics in current-carrying superconductors

被引：0
|
作者：
Bobyl, AV [1 ]
Johansen, TH [1 ]
Shantsev, DV [1 ]
机构：
[1] Univ Oslo, Dept Phys, N-0316 Oslo, Norway
来源：
MAGNETO-OPTICAL IMAGING | 2004年 / 142卷
关键词：
current-carrying; transport current; YBCO; inversion; creep; dendritic instability;
D O I：
暂无
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
PC controlled setup for magneto- optical (MO) investigations of current- carrying superconducting films was developed. It included a current pulse circuit synchronized with the microscope and PC software for image processing allowing us to determine field distributions across superconducting Strip using spatially-dependent calibration and iterative inversion to find current distributions. We study these distributions during and after a current pulse, with and without applied magnetic field, current re-distribution during the pulse, precursors to strip bum-out at high currents, and dendritic instability triggered by the pulse. We find critical-state behaviour accompanied by slow creep of magnetic flux at moderate currents in YBCO films, and fast avalanches related to heating effects at higher currents in YBCO and MgB2.
引用
收藏
页码：205 / 214
页数：10
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