Abstract
Using scanning SQUID microscopy, we have directly imaged spontaneously generated delocalized magnetic flux in 45° [001] tilt grain boundaries in films. Implications for the transport properties of the grain boundaries are discussed. A model based on a -wave symmetry component of the superconducting order parameter and on grain-boundary faceting is consistent with the results of our experiments.
- Received 23 February 1996
DOI:https://doi.org/10.1103/PhysRevLett.77.2782
©1996 American Physical Society