Berlin 2008 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 33: Symposium: High-Temperature Superconductivity
TT 33.8: Talk
Thursday, February 28, 2008, 16:50–17:05, H 0104
q-dependence of the giant bond-stretching phonon anomaly in the stripe compound La1.48Nd0.4Sr0.12CuO4 measured by IXS — •Daniel Lamago1,2, 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 La1.48Nd0.4Sr0.12CuO4. 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.