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.
Recommended Citation
F. Stercel et al., "Composition dependence of the in-plane Cu-O bond-stretching LO phonon mode in YBa2Cu3O6+x," Physical Review B-Condensed Matter and Materials Physics, vol. 77, no. 1, American Physical Society, Jan 2008.
The definitive version is available at https://doi.org/10.1103/PhysRevB.77.014502
Department(s)
Materials Science and Engineering
International Standard Serial Number (ISSN)
2469-9969, 2469-9950
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2026 American Physical Society, All rights reserved
Publication Date
2008-01-01
Comments
Acknowledgements: The authors are grateful to K. A. Müller, L. P. Gor’kov, A. Bussmann-Holder, D. Reznik, E. Dagotto, and A. Moreo for useful discussions. The work carried out at the University of Pennsylvania and at the University of Tennessee was supported by the National Science Foundation through DMR04- 04781.