Anisotropic energy gaps in copper oxide superconductors
Gerald D. Mahan
DOI 10.1103/PhysRevB.40.11317 · Physical Review B
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Abstract
Gap anisotropy is discussed for a two-dimensional superconductor on a square lattice. For s-wave pairing the simplest form of anisotropy is Δ(φ)=Δ0+Δ1 cos(4φ), where tan(φ)=kx/ky. This kind of gap anisotropy predicts a characteristic conductance in electron tunneling, which fits some of the reported experiments.
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