Abstract
Well-defined zigzag-shaped ramp-type Josephson junctions between and Nb have been studied. The magnetic field dependencies of the critical currents provide evidence for -wave–induced alternations in the direction of the Josephson current between neighboring sides of the zigzag structure. The arrays present controllable model systems to study the influences of facets in high-angle high- grain boundaries. From the characteristics, we estimate a possible imaginary -wave admixture to the order parameter of the to be below .
- Received 15 August 2001
DOI:https://doi.org/10.1103/PhysRevLett.88.057004
©2002 American Physical Society