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

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

1997-07-03

arxiv.org/abs/cond-mat/9707030v1

Phys. Rev. Lett. 80, 2917 (1998)

Physics

Condensed Matter

Superconductivity

4 pages, LATEX, 5 eps figs

Scientific paper

10.1103/PhysRevLett.80.2917

We consider proximity effect coupling in Superconducting/Antiferromagnetic/Superconducting (S-A-S) 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 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 S-N-S and S-I-S junctions, but for thin junctions it shows a sharp break in slope at the Freedericksz point.

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