Vortex Dynamics at the transition to the normal state in YBCO films

Abstract

We propose a description of the vortex dynamics in YBCO films from the critical to the normal states. This description supposes that the vortex motion is thermally activated along the twin boundaries of the films. The discontinuity observed in the current-voltage curves at the transition to the normal state is explained by the sudden increase in the dissipated power rate due to vortex depinning. However, near the critical temperature, this phenomenon does not occur because the vortex activation energy is near zero. We also show how the current at the transition to the normal state can be computed from the current-voltage curves measured at low currents. The predictions of this description are compared to the data published by Gonzalez et al. [Phys.Rev.B68,054514 (2003)].

References in corpus (5)

• Role of twin boundaries on the vortex dynamics in YBa${}_2$Cu${}_3$O${}_7$
• Current-induced highly dissipative domains in high Tc thin films
• Avalanches and Self-Organized Criticality in Superconductors
• Normal-superconducting transition induced by high current densities in YBa2Cu3O7-d melt-textured samples and thin films: Similarities and differences
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Cited by in corpus (2)

• An analytical approach to the thermal instability of superconducting films under high current densities
• Transport properties of ybco thin films near the critical state with no applied field