Abstract
Evidence for strong electron–phonon coupling inhigh-Tc cuprates is reviewed, with emphasis on the electron and phonon spectral functions. Effectsdue to the interplay between the Coulomb and electron–phonon interactions are studied.For weakly doped cuprates, the phonon self-energy is strongly reduced due tocorrelation effects, while there is no corresponding strong reduction for the electronself-energy. Polaron formation is studied, focusing on effects of Coulomb interaction andantiferromagnetic correlations. It is argued that experimental indications of polaronformation in undoped cuprates are due to a strong electron–phonon interaction for thesesystems.
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