Trapping a Single Vortex and Reducing Quasiparticles in a Superconducting Resonator

I. Nsanzineza and B. L. T. Plourde
Phys. Rev. Lett. 113, 117002 – Published 12 September 2014
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Abstract

Vortices trapped in thin-film superconducting microwave resonators can have a significant influence on the resonator performance. Using a variable-linewidth geometry for a weakly coupled resonator, we are able to observe the effects of a single vortex trapped in the resonator through field cooling. For resonant modes where the vortex is near a current antinode, the presence of even a single vortex leads to a measurable decrease in the quality factor and a dispersive shift of the resonant frequency. For modes with the vortex located at a current node, the presence of the vortex results in no detectable excess loss and, in fact, produces an increase in the quality factor. We attribute this enhancement to a reduction in the density of nonequilibrium quasiparticles in the resonator due to their trapping and relaxation near the vortex core.

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  • Received 21 April 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.117002

© 2014 American Physical Society

Authors & Affiliations

I. Nsanzineza and B. L. T. Plourde*

  • Department of Physics, Syracuse University, Syracuse, New York 13244-1130, USA

  • *bplourde@syr.edu

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Issue

Vol. 113, Iss. 11 — 12 September 2014

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