Field-dependent critical current in type-II superconducting strips: Combined effect of bulk pinning and geometrical edge barrier
Andrey A. Elistratov, Denis Yu. Vodolazov, Igor L. Maksimov, John R. Clem
DOI 10.1103/PhysRevB.66.220506 · Physical Review B
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Abstract
Recent theoretical and experimental research on low-bulk-pinning superconducting strips has revealed striking domelike magnetic-field distributions due to geometrical edge barriers. The observed magnetic-flux profiles differ strongly from those in strips in which bulk pinning is dominant. In this paper we theoretically describe the current and field distributions of a superconducting strip under the combined influence of both a geometrical edge barrier and bulk pinning at the strip’s critical current Ic, where a longitudinal voltage first appears. We calculate Ic and find its dependence upon a perpendicular applied magnetic field Ha. The behavior is governed by a parameter p, defined as the ratio of the bulk-pinning critical current Ip to the geometrical-barrier critical current Is0. We find that when p>2/π and Ip is field independent, Ic vs Ha exhibits a plateau for small Ha, followed by the dependence Ic−Ip∝Ha−1 in higher magnetic fields.
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