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Quasiparticle relaxation in optically excited high-Q superconducting resonators

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arxiv 0802.0640 v2 pith:HNC3XQY4 submitted 2008-02-05 cond-mat.supr-con cond-mat.mes-hall

Quasiparticle relaxation in optically excited high-Q superconducting resonators

R. Barends , J. J. A. Baselmans , S. J. C. Yates , J. R. Gao , J. N. Hovenier , T. M. Klapwijk This is my paper
classification cond-mat.supr-con cond-mat.mes-hall
keywords relaxationelectron-phononsuperconductingtimefindinteractionquasiparticletemperature
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The quasiparticle relaxation time in superconducting films has been measured as a function of temperature using the response of the complex conductivity to photon flux. For tantalum and aluminium, chosen for their difference in electron-phonon coupling strength, we find that at high temperatures the relaxation time increases with decreasing temperature, as expected for electron-phonon interaction. At low temperatures we find in both superconducting materials a saturation of the relaxation time, suggesting the presence of a second relaxation channel not due to electron-phonon interaction.

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