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Photoemission kinks and phonons in cuprates

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Abstract

Arising from: F. Giustino, M. L. Cohen & S. G. Louie Nature 452, 975–978 (2008)10.1038/nature06874

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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Figure 1: Comparison of DFT predictions with experimental results for La 1.85 Sr 0.15 CuO 4 and YBa 2 Cu 3 O 7 at 10 K.

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Authors and Affiliations

  1. * Forschungszentrum Karlsruhe, Institut für Festkörperphysik, PO Box 3640, D-76021 Karlsruhe, Germany. reznik@llb.saclay.cea.fr ,

    D. Reznik

  2. Max-Planck-Institut für Festkörperforschung, D-70506 Stuttgart, Germany

    G. Sangiovanni

  3. ‡ Department of Photon Science, Stanford Linear Accelerator Center, Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA,

    O. Gunnarsson & T. P. Devereaux

Authors
  1. D. Reznik
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  2. G. Sangiovanni
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  3. O. Gunnarsson
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  4. T. P. Devereaux
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Reznik, D., Sangiovanni, G., Gunnarsson, O. et al. Photoemission kinks and phonons in cuprates. Nature 455, E6–E7 (2008). https://doi.org/10.1038/nature07364

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