The Electron-Phonon Interaction Renormalized by Strong Correlations:
The Way to HTS

M. Kulic and O.V. Dolgov

Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth, Germany
Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany 

Tunneling and point contact spectroscopy show clear phonon features and together with optic measurements give strong support that the electron-phonon interaction (EPI) is large in HTS oxides. Strong electronic correlations (SEC), which renormalize the EPI in HTS oxides, together with the prononced Madelung energy give rise to the forward scattering peak in the EPI (FSP-EPI) for small hole doping d<< 1. The FSP-EPI mechanism explains relevant properties of the normal and superconducting states in HTS oxides.

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