Abstract
We follow the classic strong-coupling theory of superconductivity through electron–phonon interaction with a buckling-like phonon mode. We find a nonzero d-wave order parameter in the sense of the Eliashberg theory. We derive a zero temperature gap Δ(0,π) at the gap edge versus the electron–phonon coupling strength g 2 relation. We find that large enough value for Δ(0,π) as compared to those of high- T c superconductors cannot be realized in the electron-buckling-like-phonon coupling on the CuO 2 planes.
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