Dendritic magnetic instability in superconducting MgB2 films

Details Dendritic magnetic instability in superconducting MgB2 films Dendritic magnetic instability in superconducting MgB2 films

2001-04-06

arxiv.org/abs/cond-mat/0104113v4

Europhys. Lett. 59, No. 4, p.599-605 (2002)

Physics

Condensed Matter

Superconductivity

Extended version: 4 pages, 7 figures, submitted to PRL, for high-quality MO images see http://www.fys.uio.no/faststoff/ltl/r

Scientific paper

10.1209/epl/i2002-00146-1

Magneto-opitcal studies of a c-oriented epitaxial MgB2 film show that below 10 K the global penetration of vortices is dominated by complex dendritic structures abruptly entering the film. We suggest that the observed behavior is due to a thermo-magnetic instability which is supported by vortex dynamics simulations. The instability is also responsible for large fluctuations in the magnetization curves in MgB2 at low temperatures.

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