Abstract
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 language | English |
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Pages (from-to) | 327-330 |
Number of pages | 4 |
Journal | Journal of Superconductivity and Novel Magnetism |
Volume | 15 |
Issue number | 5 |
Publication status | Published - 2002 |
Keywords
- In-plane anisotropy
- MAPS
- Phonon dispersion
- Y-based cuprates
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics