Phonon Dispersion Measurements of YBa2Cu3O6.15 and YBa2Cu3O6.95 by Time-of-Flight Neutron Spectroscopy
Journal Article
·
· Journal of Superconductivity
- National Institute of Standards and Technology (NIST)
- University of Pennsylvania
- Ames Laboratory
- ORNL
- Institute of Materials Structure Science, Japan
- Tohoku University, Japan
- Superconductivity Research Laboratory, Japan
- ISIS Facility, Rutherford Appleton Laboratory
- University of Washington, Seattle
We measured the phonon dispersions of YBa{sub 2}Cu{sub 3}O{sub 6.15} and YBa{sub 2}Cu{sub 3}O{sub 6.95} 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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 978071
- Journal Information:
- Journal of Superconductivity, Vol. 15, Issue 5; ISSN 0896-1107
- Country of Publication:
- United States
- Language:
- English
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