Vortex microavalanches in superconducting Pb thin films

Article

关键词: FIELD PENETRATION;    AVALANCHES;    MAGNETIZATION;    INSTABILITY;    GROWTH;   

DOI  :  10.1103/PhysRevB.68.224509

来源: SCIE

【 摘 要 】

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=0.7T(c). 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.

【 授权许可】

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