Superconducting order parameter in bilayer cuprates: Occurrence of π phase shifts in corner junctions
D. Z. Liu, K. Levin, J. Maly
DOI 10.1103/PhysRevB.51.8680 · Physical Review B
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Abstract
We study the order-parameter symmetry in bilayer cuprates such as Y-Ba-Cu-O, where interesting π phase shifts have been observed in Josephson junctions. Taking models that represent the measured spin-fluctuation spectra of this cuprate, as well as more general models of Coulomb-correlation effects, we classify the allowed symmetries and determine their associated physical properties. π phase shifts are shown to be a consequence of repulsive interactions, independent of whether a magnetic mechanism is operative. While it is known to occur in d states, this behavior can also be associated with (orthorhombic) s symmetry when the two subband gaps have opposite phase. Implications for the magnitude of Tc are discussed.
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