The formation and propagation of flux avalanches in tailored MgB2 films

Details The formation and propagation of flux avalanches in tailored MgB2 films The formation and propagation of flux avalanches in tailored MgB2 films

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12i3043t&link_type=abstract

New Journal of Physics, Volume 12, Issue 9, pp. 093043 (2010).

Physics

2

Scientific paper

The applications of superconducting magnesium diboride are substantially limited by the presence of magnetic flux avalanches at low temperatures. Here, quickly moving magnetic vortices create large amounts of heat and magnetic noise. Such avalanches can be suppressed by evaporating metal layers to the surface of the superconductor, which acts both as a heat sink and as an electromagnetic drag by induced eddy currents. We show that it is necessary to distinguish between the mechanisms that are responsible for the formation and the propagation of avalanches. A high critical current favors avalanche formation but avalanche propagation is suppressed. The diverse consequences for creation and propagation explain the preference of avalanches for inhomogeneous superconductors.

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