Proximity Effect and Josephson Coupling in the SO(5) Theory of High- Tc Superconductivity

We consider proximity effect coupling in superconducting-antiferromagnetic-superconducting sandwiches using the recently developed SO(5) effective theory of high temperature superconductivity. We find that, for narrow junctions, the A region acts like a strong superconductor, and that there is a critical junction thickness which depends on the effective SO(5) coupling constants and on the phase difference across the junction, at which the A …