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TT: Fachverband Tiefe Temperaturen

TT 33: Symposium: High-Temperature Superconductivity

TT 33.5: Vortrag

Donnerstag, 28. Februar 2008, 15:55–16:10, H 0104

The phonon buckling mode in YBa₂Cu₃O_6+x measured by inelastic neutron scattering — •Markus Raichle¹, Dmitry Reznik², Mohammed Bakr¹, Vladimir Hinkov¹, Klaudia Hradil³, Daniel Lamago², Clemens Ulrich¹, Markus Bröll¹, Philippe Bourges², Yvan Sidis², Chengtian Lin¹, and Bernhard Keimer¹ — ¹MPI für Festkörperforschung, Stuttgart, Germany — ²Laboratoire Léon Brillouin, Paris, France — ³Universität Göttingen, Göttingen, Germany

Cuk et al. [Phys. Rev. Lett. 93, 117003 (2004)] and Devereaux et al. [Phys. Rev. Lett. 93, 117004 (2004)] relate the antinoidal kink in ARPES measurements with the B1g phonon buckling mode. However, this assumption is controversial as this kink has also been related to the magnetic resonance mode by Kaminski et al. [Phys. Rev. Lett. 86, 1070 (2001)] and Kim et al. [Phys. Rev. Lett. 91, 167002 (2003)]. Until now inelastic neutron scattering measurements on this phonon mode on YBa₂Cu₃O_6+x by Reznik et al. [Phys. Rev. Lett. 75, 2396 (1995)] has only been done on twinned samples for x=1. Here we present high resolution neutron measurements on the buckling mode on YBCO for x=0.6 and x=1.0. These measurements performed at Puma and 1T1 at Saclay have been made on fully detwinned samples. Thus we could show that this phonon mode performes an anisotropic superconductivity-induced interaction with a neighboring phonon mode. Hence these measurements enrich the experimental evidence for superconductivity induced phonon effects in high temperature superconductors.