Phonon origin of low energy and high energy kinks in high temperature cuprate superconductors

Details Phonon origin of low energy and high energy kinks in high temperature cuprate superconductors Phonon origin of low energy and high energy kinks in high temperature cuprate superconductors

2010-05-21

arxiv.org/abs/1005.3930v3

EPL, 90 (2010) 47005

Physics

Condensed Matter

Superconductivity

11 pages, 3 figures

Scientific paper

Eliashberg theory generalized for the account of the electron-hole nonequivalence and electron correlations in the vertex function is used. The phonon contribution to the nodal electron Green function in cuprates is viewed. At non- zero temperatures the singularities (kinks) in the frequency behavior of a real and imaginary part of an electron nodal Green function, and also in the nodal part of the density of the electron states modified by an electron-phonon interaction are studied. It is shown that near the optimal doping both the low-energy and high-energy nodal Green function kinks and also the abnormal broadening of a band in cuprates are reproduced with the electron-phonon interaction in the extended Eliashberg theory.

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