Abstract
Josephson currents in superconductor-normal metal-superconductor junctions are studied numerically when the normal metal region is in the diffusive regime. The average critical current and the fluctuations of the critical current are calculated as a function of the length of the normal metal region L . In the case where L is shorter than the coherence length of the superconductor ξ, the magnitude of the fluctuations is shown to be of order \(e{\mit\Delta}/\hbar \) (Δ is the pair potential). When L is several times as long as ξ, numerical results suggest that the fluctuations become of order \(e\sqrt {{\mit\Delta}E_{{\rm c}}}/\hbar \) ( E c is the correlation energy). These results are compared with previous theoretical studies.
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