Reentrant stability of superconducting films

Details Reentrant stability of superconducting films Reentrant stability of superconducting films

2007-02-28

arxiv.org/abs/cond-mat/0702683v1

Physics

Condensed Matter

Superconductivity

Scientific paper

We propose a mechanism responsible for the abrupt vanishing of the dendritic flux instability found in many superconducting films when an increasing magnetic field is applied. The onset of flux avalanches and the subsequent reentrance of stability in NbN films was investigated using magneto-optical imaging, and the threshold fields were measured as functions of critical current density, $j_c$. The results are explained with excellent quantitative agreement by a thermomagnetic model published recently, Phys. Rev. B73, 014512 (2006), showing that the reentrant stability is a direct consequence of a monotonously decreasing $j_c$ versus field.

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