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Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: Superconductivity: Cuprate High-Temperature Superconductors 1

TT 25.7: Talk

Wednesday, March 25, 2009, 11:15–11:30, HSZ 304

Electron-Phonon Interaction in Strongly Correlated Systems — •giorgio sangiovanni1 and olle gunnarsson21Vienna University of Technology — 2Max-Planck Institute - Stuttgart

Oxygen isotope effect on the low-energy dispersion kink has been recently reported by Iwasawa et al. using high-resolution laser photoemission [1], suggesting a major role of the half-breathing oxygen phonon in high-temperature superconducting cuprates. The same phonon mode displays a huge anomaly approximately half-way to the zone boundary in the dispersion and in the width detected by inelastic neutron scattering [2]. In order to get a strong coupling to the half-breathing and other phonon modes in theoretical calculations electronic correlations turn out to be an essential ingredient.

[1] H. Iwasawa, et al., Phys. Rev. Lett. 101, 157005 (2008)

[2] D. Reznik, et al., Nature 455, E6 (2008)

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