Abstract
We report the use of a parallel magnetic field to suppress the superconducting gap and intergrain Josephson coupling in granular Al films. The critical field ${H}_{c}\ensuremath{\parallel}$ is spin paramagnetically limited, and the field induced superconductor-insulator (S-I) transition is found to go from second order to first order at 250 mK. In the vicinity of ${H}_{c}\ensuremath{\parallel}$, the field reproduces the quasireentrance and super-resistive behavior seen in the zero-field S-I transition. We show that the super-resistive phase is dominated by Coulomb blockade.
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