Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 151, Issue 1-2, Pages 585-590Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-007-9690-5
Keywords
thin superconducting films; niobium nitride; critical current; magnetic vortex; edge barrier
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The temperature dependence of the critical current of NbN thin-film bridges was experimentally studied. At low temperatures we observed significant enhancement (up to two times at 4 K) of the critical current density over de-pinning value in the sub-micrometer wide bridges. This enhancement can be described by an increase of the edge barrier for penetration of magnetic vortices into narrow superconducting strips.
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