One of the possible mechanisms of high Tc superconductivity is Cooper pairing with the help of bosons, which change the slope of the electronic dispersion as observed by photoemission. Giustino et al. calculated that in the high temperature superconductor La1.85Sr0.15CuO4 crystal lattice vibrations (phonons) should have a negligible effect on photoemission spectra and concluded that phonons do not play an important role. We show that the calculations employed by Giustino et al. fail to reproduce huge influence of electron-phonon coupling on important phonons observed in experiments. Thus one would expect these calculations to similarly fail in explaining the role of electron-phonon coupling for the electronic dispersion.
@article{arxiv.0809.0475,
title = {Photoemission kinks and phonons in cuprates},
author = {D. Reznik and G. Sangiovanni and O. Gunnarssonii and T. P. Devereaux},
journal= {arXiv preprint arXiv:0809.0475},
year = {2009}
}
Comments
To appear in Nature as a Brief Communiction Arising