Phonon Dispersion Measurements of YBa2Cu3O6.15 and YBa2Cu3O6.95 by Time-of-Flight Neutron Spectroscopy

Author

• J-H Chung
• T. Egami
• R. J. McQueeney
• M. Yethiraj
• M. Arai
• T. Yokoo
• Herbert A. Mook
• Y. Endoh
• S. Tajima
• C. Frost
• Fatih Dogan, Missouri University of Science and TechnologyFollow

Abstract

We measured the phonon dispersions of YBa₂Cu₃O_6.15 and YBa₂Cu₃O_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 an isotropy beyond what is expected for structural origin. Such an isotropy 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.

Recommended Citation

J. Chung and T. Egami and R. J. McQueeney and M. Yethiraj and M. Arai and T. Yokoo and H. A. Mook and Y. Endoh and S. Tajima and C. Frost and F. Dogan, "Phonon Dispersion Measurements of YBa2Cu3O6.15 and YBa2Cu3O6.95 by Time-of-Flight Neutron Spectroscopy," Journal of Superconductivity, vol. 15, no. 5, pp. 327 - 330, Springer, Oct 2002.

The definitive version is available at https://doi.org/10.1023/A:1021057810930

Department(s)

Materials Science and Engineering

Comments

Acknowledgements: This work was supported by the National Science Foundation through DMR01-02565.

Keywords and Phrases

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

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2026 Springer Nature, All rights reserved

Publication Date

2002-10-01