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The maximum zero-voltage (Josephson) current Iₛ in identical-superconductor tunnel junctions is shown to be related to the response of the bulk superconductor to ac fields. Strong-coupling effects reduce Iₛ to 78.8% of the weak-coupling prediction for Pb and to 91.1% of that for Sn, corresponding to similar strong-coupling reductions in the bulk supercurrent response of these materials.
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Fulton et al. (1968) studied this question.
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