"Chain scenario" for Josephson tunneling with pi-shift in YBa2Cu3O7

Details "Chain scenario" for Josephson tunneling with pi-shift in YBa2Cu3O7 "Chain scenario" for Josephson tunneling with pi-shift in YBa2Cu3O7

1995-04-19

arxiv.org/abs/cond-mat/9504076v2

PRL 75, 2574 (1995)

Physics

Condensed Matter

4 pages, revtex, 1 figure uuencoded (POSTSCRIPT figure replaced - the previous file did not print Greek letters correctly)

Scientific paper

10.1103/PhysRevLett.75.2574

We point out that all current Josephson-junction experiments probing directly the symmetry of the superconducting state in YBa2Cu3O7, can be interpreted in terms of the bilayer antiferromagnetic spin fluctuation model, which renders the superconducting state with the order parameters of extended $s$ symmetry, but with the opposite signs in the bonding and antibonding Cu-O plane bands. The essential part of our interpretation includes the Cu-O chain band which would have the order parameter of the same sign as antibonding plane band. We show that in this case net Josephson currents along and perpendicular to the chains have the phase shift equal to pi.

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