Size of flux jumps in superconducting films

Abstract

Magneto-optical imaging is used to visualize vortex avalanches in MgB2 films at 4K. Avalanches ranging from 50 to 50000 vortices were detected. The size distribution function has a clear peak whose position moves towards larger sizes as the applied field increases. This field dependence as well as variation of flux density profile during an avalanche are well described by a proposed model assuming a thermal origin of the avalanches. The model is based on the adiabatic approach and takes into account nonlocal electrodynamics in thin superconductors. The threshold field for thermal avalanches is predicted to be much smaller than that for thick superconductors, in agreement with the experiment.

arXiv comment8 pages, 10 figures, submitted to PRB

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Cited by in corpus (9)

• Dendritic and uniform flux jumps in superconducting films
• Onset of dendritic flux avalanches in superconducting films
• Nucleation and propagation of thermomagnetic avalanches in thin-film superconductors
• Collapse of the critical state in superconducting niobium
• Evidence of rf-driven branching of dendritic vortex avalanches in MgB2 microwave resonators
• Oscillatory regimes of the thermomagnetic instability in superconducting films
• Flux Penetration in Superconducting Strip with Edge-Indentation
• Dendritic flux avalanches in a superconducting MgB2 tape
• Scaling Behavior of Quasi-One-Dimensional Vortex Avalanches in Superconducting Films