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TT: Fachverband Tiefe Temperaturen

TT 33: Symposium: High-Temperature Superconductivity

TT 33.8: Vortrag

Donnerstag, 28. Februar 2008, 16:50–17:05, H 0104

q-dependence of the giant bond-stretching phonon anomaly in the stripe compound La_1.48Nd_0.4Sr_0.12CuO₄ measured by IXS — •Daniel Lamago^1,2, Dmitry Reznik², T. Fukuda³, K. Yamada⁴, and A.Q.R. Baron⁴ — ¹CEA Saclay, 91191 Gif Sur Yvette, France — ²Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany — ³Synchrotron Radiation Research Unit, Japan Atomic Energy Agency (Spring 8), Sayo, Hyogo 679-5148, Japan — ⁴Materials Dynamics Laboratory, Harima RIKEN, 1-1-1 Kouto, Sayo, Hyogo, 679-5148 Japan

Inelastic x-ray scattering (IXS) was used to study the Cu-O bond-stretching vibrations in the static stripe phase compound La_1.48Nd_0.4Sr_0.12CuO₄. It was found that the intrinsic width in Q-space of the previously reported huge anomalous phonon softening and broadening is approximately 0.08 r.l.u. HWHM. A detailed comparison was also made to inelastic neutron scattering (INS) studies, which reported a two-peak lineshape with a "normal" and an "anomalous" phonon peaks. The "normal" branch in the neutron data seems to be mostly suppressed in the high resolution IXS data. Otherwise the agreement between the INS and the IXS was excellent.