EFFECTIVE QUASIPARTICLE RECOMBINATION TIMES AND ELECTRONIC DENSITY OF STATES AT THE FERMI LEVEL IN SUPERCONDUCTING FILMS

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Abstract
Quasiparticle recombination times τexp, directly measured in evaporated superconducting Sn- and Al-tunnel junctions, show reasonable agreement with the values calculated on the basis of the ray-acoustic trapping lifetime model of Eisenmenger et al. τexp decreases in O2 -perturbed granular Al-junctions. In Pb the measured times indicate 2Ɗ-phonon volume losses. The electronic density of states at the Fermi-Level No in Sn-, Pb- and Al-films differs less than 5 % from No of the corresponding bulk material

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