Dendritic flux avalanches and nonlocal electrodynamics in thin superconducting films

Details Dendritic flux avalanches and nonlocal electrodynamics in thin superconducting films Dendritic flux avalanches and nonlocal electrodynamics in thin superconducting films

2004-07-19

arxiv.org/abs/cond-mat/0407490v1

Phys. Rev. Lett. 94, 037002 (2005)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, see http://mti.msd.anl.gov/aran_h1.htm for extensive collection of movies of dendritic flux and temperatur

Scientific paper

10.1103/PhysRevLett.94.037002

We present numerical and analytical studies of coupled nonlinear Maxwell and thermal diffusion equations which describe nonisothermal dendritic flux penetration in superconducting films. We show that spontaneous branching of propagating flux filaments occurs due to nonlocal magnetic flux diffusion and positive feedback between flux motion and Joule heat generation. The branching is triggered by a thermomagnetic edge instability which causes stratification of the critical state. The resulting distribution of magnetic microavalanches depends on a spatial distribution of defects. Our results are in good agreement with experiments performed on Nb films.

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