Properties of superconducting microbridges in the pure limit

An exact solution of Eilenberger's equations for a superconducting microbridge in the limit a ≪ ξ0, a ≪ l is given (a is the radius of the constriction between the superconductors, l is the mean free path and ξ0 is the coherence length). The current is independent of the ratio between l and ξ0 is expressed in terms of the contact resistance in the normal state. When T = 0, the magnitude of the critical current exceeds the critical current of the tunnel contact with the same resistance, by a factor of two.

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