Superconducting tunnel junction detectors: the quasiparticle diffusion in the nonlinear regime
1995; Elsevier BV; Volume: 355; Issue: 2-3 Linguagem: Inglês
10.1016/0168-9002(94)01154-0
ISSN1872-9576
AutoresE. Esposito, B. I. Ivlev, C. Nappi, Giovanni Piero Pepe, U. Scotti di Uccio,
Tópico(s)Superconductivity in MgB2 and Alloys
ResumoX-ray STJ detector response is analyzed in the framework of the kinetic transport equation for the non-equilibrium quasi-particles. Numerical solutions of the resulting equation which describes the diffusion of excitations in the plane of the junction are presented and discussed. A particular attention is paid to the limits of “small” and “large” junctions, with respect to the effective diffusion length of quasi-particles. An almost linear behaviour is expected, under suitable conditions, for “large” Nb-based devices, in agreement with experiments reported in the current literature. Deviations from linearity are however possible in “small” devices or in case of short electronic mean free path.
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