Fluctuations of the Critical Current through Josephson Junctions with Dirty Normal Metal Barriers
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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 ζ, the magnitude of the fluctuations is shown to be of order eΔ/&plank; (Δ is the pair potential). When L is several times as long as ζ, numerical results suggest that the fluctuations become of order e√<△E_c>/&plank; (E_c is the correlation energy). These results are compared with previous theoretical studies.
- 社団法人日本物理学会の論文
- 1994-07-15
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