The role of a finite-width Riedel peak in the interference conductivity of a Josephson tunnel junction is treated phenomenologically. It is shown that allowance for the finite width of the peak can lead to a change in sign of this conductivity in the region ω≪Δ from positive, as given by standard theory, to negative. Separate mechanisms responsible for finite peak width are analyzed. It is found that only some of these mechanisms lead to the change in the interference conductivity mentioned above. The results obtained are compared with experiment.
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Zorin et al. (1979) studied this question.
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