Flux Jumps Driven by a Pulsed Magnetic Field

TL;DR

This study investigates flux jumps in high temperature superconductors, examining how heavy ion irradiation affects their stability under pulsed magnetic fields with varying sweep rates.

Contribution

It provides experimental insights into how heavy ion irradiation influences flux jump behavior and stability in HTSCs under different magnetic and thermal conditions.

Findings

Flux jumps depend on magnetic field and sweep rate.

Heavy ion irradiation alters flux jump characteristics.

Flux jumps are influenced by thermal contact and critical current density.

Abstract

The understanding of flux jumps in the high temperature superconductors is of importance since the occurrence of these jumps may limit the perspectives of the practical use of these materials. In this work we present the experimental study of the role of heavy ion irradiation in stabilizing the HTSC against flux jumps by comparing un-irradiated and 7.5 10^10 Kr-ion/cm2 irradiated (YxTm1-x)Ba2Cu3O7 single crystals. Using pulsed field magnetization measurements, we have applied a broad range of field sweep rates from 0.1T/s up to 1800 T/s to investigate the behavior of the flux jumps. The observed flux jumps, which may be attributed to thermal instabilities, are incomplete and have different amplitudes. The flux jumps strongly depend on the magnetic field, on the magneto-thermal history of the sample, on the magnetic field sweep rate, on the critical current density jc, on the temperature and on the thermal contact with the bath in which the sample is immersed.