| Issue |
Europhys. Lett.
Volume 59, Number 4, August 2002
|
|
|---|---|---|
| Page(s) | 599 - 605 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and opticalproperties | |
| DOI | https://doi.org/10.1209/epl/i2002-00146-1 | |
| Published online | 01 August 2002 | |
Dendritic magnetic instability in superconducting 
films
1
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
Corresponding authors: t.h.johansen@fys.uio.no, silee@postech.ac.kr
Received:
18
March
2002
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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