Superconducting parameters of lead in Al/Formvar/Pb tunnel junctions

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Abstract
The functions Δ(ω), α2(ω) F(ω) and Z(ω) and the parameters λ, <ωn>, μ* of Pb are calculated by analysing the tunnel characteristics of Al/Formvar/Pb junctions. The results, in comparison with those obtained on Al/AlxOy/Pb tunnel junctions, seem to exclude the direct influence of the Formvar on the electron-phonon interaction function via the transfer of vibrational structures in the explored energy range. All the observed modifications (the lowering of the amplitude of the phononic peaks of the Pb and the variation of their ratio, the reduction of λ, the negative value of μ*) are connected with the particular structure of the insulator-superconductor interface. This interpretation is supported by the data of the ESCA analysis of the tunnel structure

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