Superconductor-insulator transition in a parallel magnetic field

Document Type

Article

Publication Date

1-1-1994

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 Hc 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 Hc, 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. © 1994 The American Physical Society.

Publication Source (Journal or Book title)

Physical Review Letters

First Page

1412

Last Page

1415

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