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Quasiparticle dynamics in a tantalum superconducting tunnel junction photon detector studied using phonon pulses.

Wigmore, J. K. and Boyd, P. and Kozorezov, A. G. and Bradley, D. Ian (2004) Quasiparticle dynamics in a tantalum superconducting tunnel junction photon detector studied using phonon pulses. Physica Status Solidi (C), 1 (11). pp. 2791-2794. ISSN 1610-1634

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Abstract

We have used non-equilibrium phonon pulses to mimic X-ray photon absorption in a high quality Ta superconducting tunnel junction at 20 mK. From pulse shape measurements the charge output and decay time were determined. Values obtained were in good agreement with those obtained by photo-absorption after allowance for loss due to flux trapping, Results obtained for the quasiparticle loss rate due to Abrikosov vortices (fluxoids) were compared with the trapping model of Golubov and Houwman. Comparison of Ta and Nb results suggest that at very low temperatures fluxoid trapping may result in enhanced tunnelling rather than extra loss.

Item Type: Article
Journal or Publication Title: Physica Status Solidi (C)
Uncontrolled Keywords: 74.25.Kc • 85.25.Oj
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23541
Deposited By: Dr Richard P. Haley
Deposited On: 03 Feb 2009 11:40
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:11
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23541

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