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Superconductivity and the metal-insulator transition: Tuning with spin-orbit scattering.

A small amount of bismuth was added to granular aluminum in order to enhance spin-orbit scattering. The metal-insulator transition was found to be shifted in accord with the antilocalization effect on an Anderson transition. The threshold for superconductivity is also shifted, to the same extent, remaining, as in the undoped system, separated from the metal-insulator transition by a narrow range of composition in which the samples are metallic but not fully superconducting. The correlation of the shifts demonstrates that superconductivity is suppressed by the vicinity of the metal-insulator transition.