Investigation of relaxation phenomena in high-temperature superconductors HoBa2Cu3O7−δ at the action of pulsed magnetic fields

Abstract

A mechanical method to investigate the stimulated Abrikosov vortex dynamics in superconductors has been used. We found out that pulsed magnetic fields change the path of relaxation processes taking place in vortex matter. The study of the influence of magnetic pulses differing in their durations and amplitudes on the vortex system of the isotropic high-temperature superconductor system HoBa 2 Cu 3 O 7−δ showed the presence of a threshold phenomena. Short duration pulses do not change the path of relaxation processes taking place in vortex matter. When the duration of pulses exceeds some critical value (threshold), then their influence changes the path of relaxation process which is revealed by a stepwise change of the relaxing mechanical moment τ rel . These investigations showed that the time for formatting of the Abrikosov vortex lattice in HoBa 2 Cu 3 O 7−δ is of the order of 20 µs which exceeds by one order of magnitude the time necessary for formation of a single vortex observed in type II superconductors.

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

“…one could conclude that the Abrikosov vortex system creation time in high-temperature anisotropic superconductor Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O 10-δ makes the value of the order of 150 µs. This value almost on the order of value higher then the Abrikosov vortex lattice creation time in the isotropic high-temperature superconductor of HoBa 2 Cu 3 O 7-δ system which is of the order of 20µs [22] and on two orders of value higher then the time for creation of single vortex for the first time measured by G. Boato, G.Gallinaro and C. Rizzuto [26], who showed that this time is less then 10 -5 sec. in classic type II superconductor.…”

Temperature dependence investigation of dissipation processes in strongly anisotropic hightemperature superconductors of Bi-Pb-Sr-Ca-Cu-O system synthesized using solar energy

“…Using this method, in this work it was studied the creation of Abrikosov vortex lattice structure, the kinetics of formation and disintegration of this structure and the Abrikosov vortex motion dynamics [25,26].…”