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

E. Demler; A. J. Berlinsky; C. Kallin; G. B. Arnold; M. R. Beasley

doi:10.1103/PhysRevLett.80.2917

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

E. Demler, A. J. Berlinsky, C. Kallin, G. B. Arnold, M. R. Beasley

DOI 10.1103/PhysRevLett.80.2917 · Physical Review Letters

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Abstract

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 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
PrBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown