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

TL;DR

This study investigates how pulsed magnetic fields affect relaxation processes in vortex matter of high-temperature superconductor HoBa2Cu3O7-d, revealing threshold effects and vortex lattice formation times.

Contribution

It introduces a mechanical method to study vortex relaxation phenomena and identifies threshold pulse durations that alter vortex relaxation behavior in high-temperature superconductors.

Findings

Pulsed magnetic fields influence vortex relaxation processes.

Threshold pulse durations exist beyond which vortex behavior changes.

Vortex lattice formation time is approximately 20 microseconds.

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 isotropic high-temperature superconductors system HoBa2Cu3O7-d showed the presence of threshold phenomena. The small duration pulses does 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 change the course of relaxation process which is revealed by stepwise change of relaxing mechanical moment . These investigations showed that the time for formatting of Abrikosov vortex lattice in HoBa2Cu3O7-d is of the order of 20 microsec. which on the order of value exceeds the time necessary for formation of a single vortex observed in type II superconductors.