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Unusual flux jumps above 12 K in non-homogeneous MgB2 thin films

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Abstract:

Flux jumps are well known and widespread in superconducting thin films. Low temperature superconductors in particular show flux jumping below a certain threshold temperature. MgB2 thin films exhibit large flux jumps, so-called flux avalanches, at temperatures below about 10 K. Above this temperature, the vortex state in MgB2 should be stable. Magneto-optical investigations of non-homogeneous MgB2 films show that large flux jumps can also occur in the temperature range considered as stable. However, their behavior is different from the jumps below 10 K. This means in particular that the critical state is most probably not destroyed during the propagation of these jumps.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/0953-2048/25/6/065010

Publication date: June 1, 2012

iop/sust/2012/00000025/00000006/art065010
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