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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/1028

Title: Composition dependence of the in-plane Cu-O bond-stretching LO phonon mode in YBa2Cu3O6+x.
Authors: Stercel, F
Egami, T
Mook, HA
Yethiraj, M
Chung, JH
Arai, M
Frost, C
Dogan, F
Keywords: Superconductors
Copper Oxides
Lattice Parameters
Excitation
Density
Scattering
Neutrons
Phonons
Issue Date: Jan-2008
Publisher: American Physical Society
Citation: Stercel, F., Egami, T., Mook, H. A., Yethiraj, M., Chung, J. H., Arai, M., et al. (2008). Composition dependence of the in-plane Cu-O bond-stretching LO phonon mode in YBa2Cu3O6+x. Physical Review B, 77(1), 014502.
Abstract: An inelastic pulsed neutron scattering study was performed on the dependence of the dispersion and spectral intensity of the in-plane Cu-O bond-stretching LO phonon mode on doped charge density. The measurements were made in the time-of-flight mode with the multiangle position sensitive spectrometer of the ISIS facility on single crystals of YBa2Cu3O6+x (x=0.15, 0.35, 0.6, 0.7, and 0.95). The focus of the study is the in-plane Cu-O bond-stretching LO phonon mode, which is known for strong electron-phonon coupling and unusual dependence on composition and temperature. It is shown that the dispersions for the samples with x=0.35, 0.6, and 0.7 are similar to the superposition of those for x=0.15 and 0.95 samples, and cannot be explained in terms of the structural anisotropy. It is suggested that the results are consistent with the model of nanoscale electronic phase separation, with the fraction of the phases being dependent on the doped charge density. © 2008, American Physical Society
URI: http://dx.doi.org/10.1103/PhysRevB.77.014502
http://apo.ansto.gov.au/dspace/handle/10238/1028
ISSN: 1098-0121
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