Vortex microavalanches in superconducting Pb thin films

H. A. Radovan; R. J. Zieve

doi:10.1103/PhysRevB.68.224509

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Vortex microavalanches in superconducting Pb thin films

H. A. Radovan, R. J. Zieve

DOI 10.1103/PhysRevB.68.224509 · Physical Review B

T1

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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 temperature 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown