Effect of depairing in electrodes on the stationary properties of weak links

The effect of depairing processes in electrodes on the stationary properties of short (L≪ξ∗) weak links is analyzed for arbitrary temperatures using the Usadel equations. It is shown that as the parameter γJ=γSL/ξ∗=(σNξS)/(σSL) increases σN1S,ξ∗,andξS are, respectively, the conductivity and damping length of the bridge materials and of the electrodes), the maximum in the function IS(φ) is displaced toward lower values of φ , while the characteristic voltage Vc drops proportionately to γJ−1. The functions Vc(T,γJ) are determined numerically. It is concluded that the decrease in Vc of a SNS sandwich both due to the proxi!llity effect and due to the suppression of the superconductivity of the electrodes by the current is not important if γS≲0.1.

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