Abstract
It is shown, using La2CuO4 as an example, that the already large (nonlocal) electron-phonon coupling as calculated in the adiabatic approximation is further strongly enhanced for certain phonons in the nonadiabatic regime, where dynamical screening comes into play. At the same time, a low-lying plasmon mode of the electronic system appears for wave vectors in the (0,0,1) direction which mixes strongly with the phonons of appropriate symmetry and leads in addition to the phonons to very large changes of the crystal potential. Such a coexistence of phononlike and plasmonlike modes in the same frequency range is argued to be a specific feature of the high-temperature superconductors(HTSC's) related to their layered structure and weak screening of the strong ionic forces in c direction. It leads to a significant increase of the retarded attractive interaction.
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