Oscillatory regimes of the thermomagnetic instability in superconducting films

Author
Vestgården, Jørn Inge
Galperin, Yuri
Johansen, Tom Henning
Date Issued
2016
Permalink
http://publications.ffi.no/123456789/520
DOI
10.1103/PhysRevB.93.174511
Collection
Articles
Description
Vestgården, Jørn Inge; Galperin, Yuri; Johansen, Tom Henning. Oscillatory regimes of the thermomagnetic instability in superconducting films. Physical Review B. Condensed Matter and Materials Physics 2016 ;Volum 93.(17)
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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.
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