Quasiparticle relaxation rates in Nb/AlO-x/Nb tunnel junctions due to Abrikosov vortices

J.B. Le grand, J. Martin, R.P. Hubener, A.W. Hamster, G.C.S. Brons, J. Flokstra

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    Superconducting tunnel junctions are promising detector elements in next generation x-ray, UV, and optical detectors. Quasiparticles which approach the neighborhood of the normal core may scatter and emit a phonon, thus being trapped in the Abrikosov vortex (AV). In this way the existence of AVs reduces the lifetime of quasiparticles. In this experiment excess quasiparticles in a Nb/AlO𝑥/Nb junction are created by means of a low temperature scanning electron microscope. The trapping rate of quasiparticles into AVs is determined by measuring the quasiparticle lifetime as a function of the AV concentration. This results in an effective trapping radius of the AV of 14.8±1.4nm, which is slightly less than theoretical expectations.
    Original languageEnglish
    Pages (from-to)7413-7417
    Number of pages5
    JournalJournal of Applied Physics
    Issue number11
    Publication statusPublished - 1997


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