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Europhys. Lett., 64 (4) , pp. 517-523 (2003)
Dynamics of the dendritic flux instability
in
films
U. Bolz, B. Biehler, D. Schmidt, B.-U. Runge and P. Leiderer Universität Konstanz - Universitätsstr. 10, 78464 Konstanz, Germany Bjoern.Biehler@uni-konstanz.de
(Received 23 April 2003; accepted in final form 2 September 2003)
Abstract
We have studied the dynamics of magnetic-flux avalanches in
superconducting
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
v
of the flux dendrites depends strongly on the magnetic field, and
values of
v up to 180
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.
74.72.Bk - Y-based cuprates.
74.78.Bz - High-
films.
74.25.Qt - Vortex lattices, flux pinning, flux creep.
© EDP Sciences 2003