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

A. I. Liechtenstein·I. I. Mazin·O. K. Andersen
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Abstract

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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A. I. Liechtenstein, I. I. Mazin, O. K. Andersen. 1995-01-25. s-wave superconductivity from antiferromagnetic spin-fluctuation model for bilayer materials. https://doi.org/10.1103/physrevlett.74.2303

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