Mazin I.I., Rashkeev S.N., Savrasov S.Y.
The Hopfield factor (electronic part of the electron-phonon coupling constant) is calculated in the rigid-muffin-tin approximation (RMTA) for several perovskite high-Tc superconductors. Calculations were performed in the conventional 'spherical' approximation and take into account the proper local symmetry. It is shown that the layered perovskite crystal symmetry generally favors strong electron-phonon interaction on the copper sites. The authors also estimate some non-RMTA effects.
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