Quasiparticle relaxation in high Q superconducting resonators

Conference paper (2009)
Department
Kavli Institute of Nanoscience (AS) (TU Delft)
Copyright: ©2009 Barends, R.; Van Vliet, S.; Baselmans, J.J.A.; Yates, S.J.C.; Gao, J.R.; Klapwijk, T.M.; Institute of Physics
DOI: https://doi.org/doi:10.1088/1742-6596/150/5/052016
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Published Date

31-12-2009

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Source:

Journal of physics. Conference series, 150

Faculty

Applied Sciences

Department

Kavli Institute of Nanoscience

Abstract

We present measurements of the quasiparticle relaxation time in Ta superconducting films shaped as planar resonators using the response of the complex conductivity to photon flux. These films have been implanted with magnetic (Mn) as well as non-magnetic atoms (Al). We find a significant decrease of the relaxation time with increasing impurity concentration for both cases, observing a reduction of the low temperature relaxation time, from 25 µs to 10 µs when implanting 100 ppm Mn. This indicates that impurities enhance quasiparticle relaxation in superconductors, regardless of their magnetic moment.

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