Volume 59, Number 4, August 2002
|Page(s)||599 - 605|
|Section||Condensed matter: electronic structure, electrical, magnetic, and opticalproperties|
|Published online||01 August 2002|
Dendritic magnetic instability in superconducting films
Department of Physics, University of Oslo P. O. Box 1048
Blindern, 0316 Oslo, Norway
2 A. F. Ioffe Physico-Technical Institute 26 Polytekhnicheskaya st., St. Petersburg 194021, Russia
3 National Creative Research Initiative Center for Superconductivity Department of Physics, Pohang University of Science and Technology Pigohang 790-784, Republic of Korea
Accepted: 17 May 2002
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.
PACS: 74.76.-w – Superconducting films / 74.25.Ha – Magnetic properties / 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics
© EDP Sciences, 2002
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