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Using time-dependent Ginzburg-Landau theory, we study the dynamic properties of a rectangular superconducting loop, which are found to depend on the position of the current leads. For asymmetric positioning of the leads, different kinetic inductance of the two paths for injected electric current leads to different critical conditions in the two branches. System self-regulates by allowing vortex entry, as vortex currents bring equilibration between the two current flows and the conventional “resistive” state can be realized. We also demonstrate that individual vortex entry in the loop can be detected by measuring the voltage between normalmetal leads, for applied currents comparable in magnitude to the screening currents.

Vortices induced in a superconducting loop by asymmetric kinetic inductance and their detection in transport measurements