Current-induced dendritic magnetic instability in superconducting MgB2 films

Details Current-induced dendritic magnetic instability in superconducting MgB2 films Current-induced dendritic magnetic instability in superconducting MgB2 films

2002-01-15

arxiv.org/abs/cond-mat/0201260v2

Appl. Phys. Lett. v.80, p.4588-4590 (2002)

Physics

Condensed Matter

Superconductivity

3 pages, 3 figures, resubmitted to Appl.Phys.Lett

Scientific paper

10.1063/1.1485304

Magneto-optical imaging reveals that in superconducting films of MgB2 a transport current creates avalanche-like flux dynamics where highly branching dendritic penetration patterns are formed. The instability is triggered when the current exceeds a threshold value, and the superconductor, shaped as a long strip, is initially in the critical state. The instability exists up to 19 K, which is a much wider temperature range than in previous experiments, where dendrites were formed by applying a magnetic field. The instability is believed to be of thermo-magnetic origin indicating that thermal stabilization may become crucial in applications of MgB2.

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