The effect of phase and inelastic relaxation of electrons on superconducting properties of bismuth amorphous films

The influence of the enhancement of electron elastic scattering, whose measure is the magnitude of resistance “per square” R□, on the superconducting transition temperature Tc of cold-deposited amorphous bismuth films of thickness less than 100 Å is analyzed. It is found that a decrease in Tc with increasing R□ correlates with the enhancement of inelastic and phase relaxation of electrons. The formula proposed on the basis of the analysis describes the experimental dependence Tc(R□) and takes into account the decrease in the phase relaxation time τϕ with increasing T□ Investigations of the dependence of fluctuation conduction above Tc on temperature and transverse magnetic field reveal deviations from the Aslamazov–Larkin and Maki–Thompson corrections for ε > εt (ε = In (T/Tc)). The values of εt vary from 0.5 to 0.25 and increase with R□ These effects are explained by the effect of inelastic electron–phonon collisions leading to a decrease in τϕ with increasing temperature and to a corresponding increase in the pair braking parameter r = In (Tc0/Tc) (Tc0 is the unperturbed value of Tc).

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