Nascent vortices in current-carrying hybrid superconducting bridge
A. V. Bodyagin, D. Yu. Vodolazov
DOI 10.1103/PhysRevB.108.134519 · Physical Review B
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Abstract
We theoretically show that in a current-carrying hybrid superconductor (S)/normal metal (N) bridge there is a state with spatial oscillations of modulus of superconducting order parameter Δ along the bridge and zero vorticity. This stationary state is realized at large currents, when proximity-induced superconductivity in the N layer is suppressed. With an increase of the current the number of oscillations of Δ increases, which leads to oscillations of differential resistance or kinetic inductance of an SN bridge with normal or superconducting leads. At current the exceeding critical current Ic, this spatially oscillating state transforms to periodically in time moving the vortex chain across the SN bridge. Because of these properties, we call such a state a nascent vortex state.
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