Quasiparticle relaxation in optically excited high-Q superconducting resonators

Details Quasiparticle relaxation in optically excited high-Q superconducting resonators Quasiparticle relaxation in optically excited high-Q superconducting resonators

2008-02-05

arxiv.org/abs/0802.0640v2

Phys. Rev. Lett. 100, 257002 (2008)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.100.257002

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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