Phonon absorption by superconducting tunnel junction x-ray detectors.

Wigmore, J. K. and Steele, A. C. and Kozorezov, A. G. and Peacock, A. and den Hartog, R. and Verhoeve, P. (2003) Phonon absorption by superconducting tunnel junction x-ray detectors. Journal of Applied Physics, 93 (9). pp. 5707-5713. ISSN 1089-7550

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Pulses of nonequilibrium phonons (heat pulses) have been used to mimic the absorption of x-ray photons in superconducting niobium tunnel junctions. For device characterization, the technique provides a valuable alternative to photoabsorption with good time resolution and continuous variability of absorbed energy. In addition, excitation is uniform across the tunnel junction, so that the effects of quasiparticle diffusion can be neglected in the analysis, and hence, the Rothwarf–Taylor equations solved exactly. Consistency is obtained between device parameters obtained from phonon measurements and those inferred from modeling of photoabsorption. In addition, the quasiparticle recombination rate can be determined directly from the nonlinearity of the energy response.

Item Type:
Journal Article
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Journal of Applied Physics
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Deposited On:
11 Jul 2008 11:39
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28 Nov 2023 11:05