Abstract
It is used the mechanical method of Abrikosov vortex stimulated dynamics investigation in superconductors. With its help it was studied relaxation phenomena in vortex matter of high-temperature superconductors. It established that pulsed magnetic fields change the course of relaxation processes taking place in vortex matter. The study of the influence of magnetic pulses differing by their durations and amplitudes on vortex system of strongly anisotropic high-temperature superconductors system Bi 1.7Pb 0.3Sr 2Ca 2Cu 3O 10− δ showed the presence of threshold phenomena. The small duration pulses do not change the course of relaxation processes taking place in vortex matter. When the duration of pulses exceeds some critical value (threshold), then their influence changes the course of relaxation process which is revealed by stepwise change of relaxing mechanical moment τ rel . These investigations showed that the time for formatting of Abrikosov vortex lattice in Bi 1.7Pb 0.3Sr 2Ca 2Cu 3O 10− δ is of the order of 150 μs which on the order of value exceeds the time necessary for formation of a single vortex observed in isotropic high-temperature superconductor HoBa 2Cu 3O 7− δ and on two orders exceeds the creation time of a single vortex observed in classical type II superconductors.
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