Dynamics and morphology of dendritic flux avalanches in superconducting films

Details Dynamics and morphology of dendritic flux avalanches in superconducting films Dynamics and morphology of dendritic flux avalanches in superconducting films

2010-12-20

arxiv.org/abs/1012.4297v2

Phys. Rev. B, 84, 054537 (2011)

Physics

Condensed Matter

Superconductivity

7 pages 7 figures

Scientific paper

We develop a fast numerical procedure for analysis of nonlinear and nonlocal electrodynamics of type-II superconducting films in transverse magnetic fields taking into account realistic boundary conditions. Using this procedure we explore stability of such films with respect to dendritic flux avalanches. The calculated flux patterns are very similar to experimental magneto-optical images of MgB$_2$ and other superconductors, where the avalanche size and morphology change dramatically with temperature. We also find a threshold magnetic field, which agrees with both experiments and linear stability analysis. The simulations predict the temperature rise during an avalanche, where for a sub-microsecond time $T \approx 1.5 T_c$, and a precursor stage with large thermal fluctuations.

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