Abstract
Inelastic neutron scattering data from a twinned single-crystal of YBa2Cu3O6.95 are presented that show a distinct a-b plane anisotropy in the oxygen vibrations. The Cu-O bond-stretching type phonons are simultaneously observed along the a and b directions due to a 4 meV splitting arising from the orthorhombicity. The present results show the bond-stretching branch along b (parallel to the chain) has a continuous dispersion, while the branch along a is discontinuous, suggesting a possibility of short-range cell-doubling along a. Furthermore, the LO mode along a is split in en ergy from its TO partner at non-zero q-vectors, while the b mode is not. These results imply strong anisotropy in the electronic screening and a one-dimensional character in underlying charge fluctuations.
Recommended Citation
R. J. McQueeny and T. Egami and J. Chung and Y. Petrov and M. Yethiraj and M. Arai and Y. Inamura and Y. Endoh and C. Frost and F. Dogan, "Anisotropy in the electronic screening of oxygen lattice modes in YBa2Cu3O6.95," arXiv preprint cond-mat/0105593, ArXiv, May 2001.
The definitive version is available at https://doi.org/10.48550/arXiv.cond-mat/0105593
Department(s)
Materials Science and Engineering
Document Type
Article - Journal
Document Version
Preprint
File Type
text
Language(s)
English
Rights
© 2026 ArXiv, All rights reserved
Publication Date
2001-05-30
