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Quasi-particle lifetime broadening in normal-superconductor junctions with UPt3

par De Wilde, Yannick ;Klapwijk, Teun M.;Jansen, Aloysius G. M.;Heil, Joachim;Wyder, Peter
Référence Physica. B, Condensed matter, 218, 1-4, page (165-168)
Publication Publié, 1996-02

Article révisé par les pairs

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Résumé :

For the Andreev-reflection process of quasi-particles at a normal-metal—superconductor interface the influence of lifetime broadening of the quasi-particles on the current-voltage characteristics of NS point contacts is analyzed along the lines of the Blonder—Tinkham—Klapwijk model. The anomalous Andreev-reflection spectra obtained for the heavy-fermion compound UPt3 cannot be explained by lifetime broadening alone. Instead, an anisotropic superconducting order parameter has to be assumed which, if also lifetime broadening is included, leads to a fairly good agreement with the data.