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】
Free