Investigation of stimulated dynamics in strongly anisotropic high-temperature superconductors system Bi–Pb–Sr–Ca–Cu–O

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 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O 10-δ showed the presence of threshold phenomena. The small duration pulses doesn't change the course of relaxation processes taking place in vortex matter. When the duration of pulses exceeds some critical value (threshold), then their influence change the course of relaxation process which is revealed by stepwise change of relaxing mechanical moment .rel τ These investigation showed that the time for formatting of Abrikosov vortex lattice in Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O 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 2 Cu 3 O 7-δ and on two orders exceeds the creation time of a single vortex observed in classical type II superconductors.