Geometry-induced reduction of the critical current in superconducting nanowires

Abstract

Reduction of the critical current in narrow superconducting NbN lines with sharp and rounded bends with respect to the critical current in straight lines was studied at different temperatures. We compare our experimental results with the reduction expected in the framework of the London model and the Ginsburg-Landau model. We have experimentally found that the reduction is significantly less than either model predicts. We also show that in our NbN lines the bends mostly contribute to the reduction of the critical current at temperatures well below the superconducting transition temperature.

References in corpus (5)

• Geometry-dependent critical currents in superconducting nanocircuits
• Current Assisted, Thermally Activated Flux Liberation in Ultrathin Nanopatterned NbN Superconducting Meander Structures
• Critical-Current Reduction in Thin Superconducting Wires Due to Current Crowding
• Depairing currents in superconducting films of Nb and amorphous MoGe
• Dissipation in ultra-thin current-carrying superconducting bridges; evidence for quantum tunneling of Pearl vortices

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