Abstract
We consider proximity effect coupling in superconducting-antiferromagnetic-superconducting sandwiches using the recently developed effective theory of high temperature superconductivity. We find that, for narrow junctions, the region acts like a strong superconductor, and that there is a critical junction thickness which depends on the effective coupling constants and on the phase difference across the junction, at which the region undergoes a Freedericksz-like transition to a state which is intermediate between superconductor and antiferromagnet. For thick junctions, the current-phase relation is sinusoidal, as in standard SNS and SIS junctions, but for thin junctions it shows a sharp break in slope at the Freedericksz point.
- Received 3 July 1997
DOI:https://doi.org/10.1103/PhysRevLett.80.2917
©1998 American Physical Society