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q-Dependence of the giant bond-stretching phonon anomaly in the stripe compound La1.48Nd0.4Sr0.12CuO4 measured by IXS |
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| Authors: | D. Reznik T. Fukuda A.Q.R. Baron S. Tsutsui K. Yamada |
| Affiliation: | a Forschungszentrum Karlsruhe, Institut für Festkörperphysik, P.O.B. 3640, D-76021 Karlsruhe, Germany b Synchrotron Radiation Research Unit, Japan Atomic Energy Agency (SPring-8), Sayo, Hyogo 679-5148, Japan c Laboratoire Léon Brillouin, CE Saclay, F-91191 Gif-sur-Yvette Cedex, France d Materials Dynamics Laboratory, Harima RIKEN, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan e Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan f Institute for Material Research, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan |
| Abstract: | 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 indicate a two-peak lineshape (with superimposed broad and narrow peaks) in the vicinity of the anomaly. The high resolution IXS data show that the narrow peak is mostly an artifact of the poor transverse Q-resolution of INS. Otherwise, the agreement between the INS and IXS was excellent. |
| Keywords: | A. Superconductors D. Phonons D. Superconductivity |
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