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Phonon excitation of quasiparticles in niobium and tantalum superconducting tunnel junction photon detectors.

Wigmore, J. K. and Boyd, P. and Steele, A. C. and Kozorezov, A. G. and Bradley, D. Ian (2004) Phonon excitation of quasiparticles in niobium and tantalum superconducting tunnel junction photon detectors. Nuclear Instruments and Methods A, 520 (1-3). pp. 263-266. ISSN 0168-9002

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Abstract

We report phonon pulse measurements of quasiparticle (qp) self-recombination and trapping by Abrikosov vortice's in Nb and Ta superconducting tunnel junctions. The quasiparticle loss times, determined from the shape of the tunnel junction output pulse, were found to be strongly correlated with flux trapping. The measured results were compared with the model of Golubov and Houwman. It was found that qp self-recombination, as measured from the dependence of responsivity on absorbed phonon energy, was also modified by the presence of traps. A process of phonon-mediated de-trapping is proposed to explain the observed effects.

Item Type: Article
Journal or Publication Title: Nuclear Instruments and Methods A
Uncontrolled Keywords: superconducting tunnel junctions ; X-ray detection ; non-equilibrium phonons ; self-recombination ; fluxoid loss ; X-RAY-DETECTORS
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
Faculty of Health and Medicine > Health Research
ID Code: 23542
Deposited By: Dr Richard P. Haley
Deposited On: 03 Feb 2009 11:48
Refereed?: Yes
Published?: Published
Last Modified: 17 Sep 2013 08:18
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23542

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