Dynamics of the dendritic flux instability in YBa2Cu3O7-δ films

被引:79
作者
Bolz, U [1 ]
Biehler, B [1 ]
Schmidt, D [1 ]
Runge, BU [1 ]
Leiderer, P [1 ]
机构
[1] Univ Konstanz, D-78464 Constance, Germany
来源
EUROPHYSICS LETTERS | 2003年 / 64卷 / 04期
关键词
D O I
10.1209/epl/i2003-00261-y
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We have studied the dynamics of magnetic-flux avalanches in superconducting YBa2Cu3O7-delta films by means of a fast magneto-optic pump-probe technique. Two regimes of propagation are found: in regime I, directly after the nucleation of the avalanches by a femtosecond laser pulse, the velocity upsilon of the flux dendrites depends strongly on the magnetic field, and values of upsilon up to 180 km/s are observed. Within some ten nanoseconds after nucleation regime II is reached, where the propagation velocity has dropped by one order of magnitude and is nearly independent of sample temperature and magnetic field. Comparison with previous experiments on flux jumps in superconductors shows good qualitative agreement.
引用
收藏
页码:517 / 523
页数:7
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