Vortex microavalanches in superconducting Pb thin films

Abstract

Local magnetization measurements on 100 nm type-II superconducting Pb thin films show that flux penetration changes qualitatively with temperature. Small flux jumps at the lowest temperatures gradually increase in size, then disappear near T = 0.7Tc. Comparison with other experiments suggests that the avalanches correspond to dendritic flux protrusions. Reproducibility of the first flux jumps in a decreasing magnetic field indicates a role for defect structure in determining avalanches. We also find a temperature-independent final magnetization after flux jumps, analogous to the angle of repose of a sandpile.

6 pages, 5 figures

References in corpus (5)

• Dendritic magnetic instability in superconducting MgB2 films
• Suppression of Superconducting Critical Current Density by Small Flux Jumps in $Mg{B}_2$ Thin Films
• Dendritic flux patterns in MgB2 films
• Vortex avalanches and magnetic flux fragmentation in superconductors
• Local threshold field for dendritic instability in superconducting MgB2 films

Cited by in corpus (5)

• Experiments in vortex avalanches
• Dendritic flux penetration in Pb films with a periodic array of antidots
• Size of flux jumps in superconducting films
• Evidence of rf-driven branching of dendritic vortex avalanches in MgB2 microwave resonators
• Paramagnetic reentrance of the ac-screening: Evidence of vortex avalanches in Pb thin films