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Brief Communication Arising
Nature 455, E6-E7 (2 October 2008) | doi:10.1038/nature07364; Received 1 July 2008; Accepted 20 August 2008
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Photoemission kinks and phonons in cuprates
D. Reznik1, G. Sangiovanni2, O. Gunnarsson3 & T. P. Devereaux3
Abstract
Arising from: F. Giustino, M. L. Cohen & S. G. Louie Nature 452, 975–978 (2008)
One of the possible mechanisms of high transition temperature (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.1 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 have an important role. Here we show that the calculations used by Giustino et al.1 do not reproduce the huge influence of electron–phonon coupling on important phonons observed in experiments. Thus, we would similarly expect that these calculations do not explain the role of electron–phonon coupling for the electronic dispersion.
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