12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Quasiparticle dynamics in a tantalum supercondu...
View graph of relations

« Back

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

Research output: Contribution to journalJournal article

Published

Journal publication date2004
JournalPhysica Status Solidi (C)
Journal number11
Volume1
Number of pages4
Pages2791-2794
Original languageEnglish

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.