Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Superconductivity: Cuprate High-Temperature Superconductors 1
TT 25.7: Vortrag
Mittwoch, 25. März 2009, 11:15–11:30, HSZ 304
Electron-Phonon Interaction in Strongly Correlated Systems — •giorgio sangiovanni1 and olle gunnarsson2 — 1Vienna 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)