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  • 1
    Electronic Resource
    Electronic Resource
    Study of non-equilibrium signals in superconducting single crystal niobium (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 611-616 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We are developing a low temperature detector for dark matter based on single crystal superconducting Nb. This work requires a detailed knowledge of the behaviour of phonons and quasiparticles in Nb which arise from particle interactions. We discuss the use of superconducting tunnel junctions (STJs) and series connected arrays of superconducting tunnel junctions (SASTJs) to detect the high energy phonon flux arising from laser and particle interactions. The signal shapes and their variation with temperature for Al-Ox-Al and Sn-Ox-Sn junctions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693484
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Modelling the thermalisation of non-equilibrium phonon distributions in bulk single crystals (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 683-689 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Differentiation between types of particle interactions in single crystals may be achieved by detecting variation in the frequency distribution of phonons produced. Homogeneous superconducting tunnel junctions of a range of materials can be used to probe phonon distributions above different energy thresholds. The apparent decay times of high energy phonons (and consequently the time evolution of non-equilibrium signals) become significantly altered by the existence of the thermal phonon background. We have developed a model of the behaviour of phonon distributions and studied the way in which initially non-equilibrium distributions (superimposed on thermal distributions) thermalise. Good agreement has been observed between our model and the results obtained with superconducting tunnel junctions observing the phonon flux from laser excitations on Nb single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693496
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Superconducting tunnel junctions and quasiparticle trapping (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 521-532 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The interaction of a nuclear particle or X-ray with a superconductor leads to the breaking of Cooper pairs and the creation of excess phonons and quasiparticles. The basic physics and the use of superconducting tunnel junctions as detectors of excess quasiparticles are reviewed. For superconducting absorbers of appreciable mass intrinsic limitations require the use of the phenomenon of quasiparticle trapping. The relaxation phonons released in the trapping process can also be detected and they can lead to amplification via further pair breaking. Superconducting tunnel junctions can also detect phonons produced by particle interactions in a substrate absorber. The use of series-connected arrays of junctions to achieve high sensitivity and good energy resolution is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693471
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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