Superconductor-insulator transition in a parallel magnetic field
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
Wu, W., & Adams, P. (1994). Superconductor-insulator transition in a parallel magnetic field. Physical Review Letters, 73 (10), 1412-1415. https://doi.org/10.1103/PhysRevLett.73.1412