T H Johansen et al 2001 Supercond. Sci. Technol. 14 726 doi:10.1088/0953-2048/14/9/319
T H Johansen1, M Baziljevich1, D V Shantsev1, P E Goa1, Y M Galperin1, W N Kang2, H J Kim2, E M Choi2, M-S Kim and S I Lee2
Show affiliationsMagneto-optical studies of a c-oriented MgB2 film with a critical current density of 107 A cm-2 demonstrate a breakdown of the critical state at temperatures below 10 K. Instead of conventional uniform and gradual flux penetration in an applied magnetic field, we observe an abrupt invasion of complex dendritic structures. When the applied field subsequently decreases, similar dendritic structures of the return flux penetrate the film. The static and dynamic properties of the dendrites are discussed.
74.78.-w Superconducting films and low-dimensional structures
78.20.Ls Magnetooptical effects
74.25.Qt Vortex lattices, flux pinning, flux creep
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
68.70.+w Whiskers and dendrites (growth, structure, and nonelectronic properties)
Issue 9 (September 2001)
Received 4 June 2001
Published 22 August 2001
T H Johansen et al 2001 Supercond. Sci. Technol. 14 726
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