s-wave superconductivity from antiferromagnetic spin-fluctuation model for bilayer materials

Details s-wave superconductivity from antiferromagnetic spin-fluctuation model for bilayer materials s-wave superconductivity from antiferromagnetic spin-fluctuation model for bilayer materials

1995-01-25

arxiv.org/abs/cond-mat/9501118v1

PRL 74, 2303 (1995)

Physics

Condensed Matter

Revtex, 3 figures

Scientific paper

10.1103/PhysRevLett.74.2303

It is usually believed that the spin-fluctuation mechanism for high-temperature superconductivity results in d-wave pairing, and that it is destructive for the conventional phonon-mediated pairing. We show that in bilayer materials, due to nearly perfect antiferromagnetic spin correlations between the planes, the stronger instability is with respect to a superconducting state whose order parameters in the even and odd plane-bands have opposite signs, while having both two-dimensional $s$-symmetry. The interaction of electrons with Raman- (infrared-) active phonons enhances (suppresses) the instability.

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