Dendritic magnetic instability in superconducting MgB2 films

By T. H. Johansen, M. Baziljevich, D. Shantsev, P. E. Goa, Y. M. Gal pe rin, W. Kang, H. J. Kim, E. Choi, M.-S. Kim, S. Lee. 2001

174 citations recorded by the source corpus.

Magneto-optical imaging reveal that below 10 K the penetration of magnetic flux in MgB2 films is dominated by dendritic structures abruptly formed in response to an applied field. The dendrites show a temperature-dependent morphology ranging from quasi-1D at 4 K to large tree-like structures near 10 K. This behaviour is responsible for the anomalous noise found in magnetization curves, and strongly suppresses the apparent critical current. The instability is of thermo-magnetic origin, as supported by our simulations of vortex dynamics reproducing the variety of dendritic flux patterns.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/418d06dbbcb41fc61b7e67244762347e804f1804

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In Condensed Matter Physics

1. Ernesto Altshuler
2. Tom H. Johansen
3. Fabio Marchesoni
4. P. Hänggi

Citations in the corpus

• Colloquium: Experiments in vortex avalanches (2004, methodology): “Dendritic avalanches with the same qualitative characteristics were observed quite recently also in films of MgB2 (Johansen et al., 2002), and Nb3Sn (Rudnev et al., 2003) only here, as in the very early MOI experiments, the abrupt events were triggered simply by ramping up the applied field.”