Vortex microavalanches in superconducting Pb thin films

Details Vortex microavalanches in superconducting Pb thin films Vortex microavalanches in superconducting Pb thin films

2003-07-04

arxiv.org/abs/cond-mat/0307092v1

Physics

Condensed Matter

Superconductivity

6 pages, 5 figures

Scientific paper

10.1103/PhysRevB.68.224509

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.

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