Critical-current reduction in thin superconducting wires due to current crowding

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Published Date

03-05-2012

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Source:

Applied Physics Letters, 100 (18), 2012

ISSN:

0003-6951

ISBN:

0003-6951

Source:

http://apl.aip.org/resource/1/applab/v100/i18/p182602_s1

Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Abstract

We demonstrate experimentally that the critical current in superconducting NbTiN wires is dependent on their geometrical shape, due to current-crowding effects. Geometric patterns such as 90? corners and sudden expansions of wire width are shown to result in the reduction of critical currents. The results are relevant for single-photon detectors as well as parametric amplifiers.