Demler, EugeneBerlinksy, A.J.Kallin, C.Arnold, G.B.Beasley, M.R.2016-08-311998Demler, E., A. J. Berlinsky, C. Kallin, G. B. Arnold, and M. R. Beasley. 1998. “Proximity Effect and Josephson Coupling in the SO(5) Theory of High-Tc Superconductivity.” Physical Review Letters 80 (13) (March 30): 2917–2920. doi:10.1103/physrevlett.80.2917.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:28242606We consider proximity effect coupling in superconducting-antiferromagnetic-superconducting sand- wiches 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 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.en-USJournal Article2016-08-3110.1103/PhysRevLett.80.2917