Oscillatory regimes of the thermomagnetic instability in superconducting films

Authors

J I. Vestgarden, University of OsloFollow
Y Galperin, University of Oslo
Tom H. Johansen, University of WollongongFollow

RIS ID

107451

Publication Details

Vestgarden, J. I., Galperin, Y. M. & Johansen, T. H. (2016). Oscillatory regimes of the thermomagnetic instability in superconducting films. Physical Review B, 93 (17), 174511-1-174511-4.

Abstract

The stability of superconducting films with respect to oscillatory precursor modes for thermomagnetic avalanches is investigated theoretically. The results for the onset threshold show that previous treatments of nonoscillatory modes have predicted much higher thresholds. Thus, in film superconductors, oscillatory modes are far more likely to cause thermomagnetic breakdown. This explains the experimental fact that flux avalanches in film superconductors can occur even at very small ramping rates of the applied magnetic field. Closed expressions for the threshold magnetic field and temperature, as well oscillation frequency, are derived for different regimes of the oscillatory thermomagnetic instability.