Current-Induced Critical State in NbN Thin-Film Structures
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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.
KeywordsThin superconducting films Niobium nitride Critical current Magnetic vortex Edge barrier
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- 9.A. Engel, A. Semenov, H.-W. Hübers, K. Il’in, M. Siegel, in New Frontiers in Superconductivity Research, ed. by B.P. Martins (NOVA Publishers, New York, 2006), Chap. 6, p. 153 Google Scholar