Phonon dispersion measurements of YBa2Cu3O 6.15 and YBa2Cu3O6.95 by time-of-flight neutron spectroscopy

J. H. Chung, T. Egami, R. J. McQueeney, M. Yethiraj, M. Arai, T. Yokoo, H. A. Mook, Y. Endoh, S. Tajima, C. Frost, F. Dogan

Research output: Contribution to journalArticlepeer-review


We measured the phonon dispersions of YBa2Cu3O 6.15 and YBa2Cu3O6.95 by time-of-flight inelastic neutron scattering. The in-plane bond-stretching modes in the metallic phase showed a distinct a-b plane anisotropy beyond what is expected for structural origin. Such anisotropy in the longitudinal optical modes, which is absent in the TO, suggests strong in-plane anisotropy in the underlying electronic structure. Apical oxygen bond-stretching modes showed a large frequency change between the insulating and the metallic phases. This large softening also is beyond structural origin, and suggests the effect of local electronic environment.

Original languageEnglish
Pages (from-to)327-330
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Issue number5
Publication statusPublished - 2002


  • In-plane anisotropy
  • MAPS
  • Phonon dispersion
  • Y-based cuprates

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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