Defect controlled vortex generation in current-carrying narrow superconducting strips

Abstract

We experimentally study effect of single circular hole on the critical current $I_c$ of narrow superconducting strip with width $W$ much smaller than Pearl penetration depth $\Lambda$. We found nonmonotonous dependence of $I_c$ on the location of a hole across the strip and a weak dependence of $I_c$ on radius of hole has been found in case of hole with $\xi \ll R\ll W$ ($\xi$ is a superconducting coherence length) which is placed in the center of strip. The observed effects are caused by competition of two mechanisms of destruction of superconductivity - the entrance of vortex via edge of the strip and the nucleation of the vortex-antivortex pair near the hole. The mechanisms are clearly distinguishable by difference in dependence of $I_c$ on weak magnetic field.

7 pages, 7 figures

References in corpus (4)

• Superconducting nanowire single-photon detectors: physics and applications
• Critical-Current Reduction in Thin Superconducting Wires Due to Current Crowding
• Vortex assisted mechanism of photon counting in superconducting nanowire single photon detector revealed by external magnetic field
• Intrinsic detection efficiency of superconducting single photon detector in the modified hot spot model

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