Abstract
Temperature and composition dependences of high-energy longitudinal optical (LO) phonons in YBa2Cu3O6+x, studied by inelastic neutron scattering measurements, provide clear evidence for temperature dependent spatial inhomogeneity of doped charges. The measurements indicate that charge doping increases the volume fraction of the charged regions, while the local charge density remains unchanged. For the optimally doped sample the charge distribution changes sharply near the superconducting transition temperature, with stronger charge inhomogeneity below TC. The remarkable magnitude of the phonon response to charge suggests strong involvement of phonons in charge dynamics.
Recommended Citation
Y. Petrov et al., "Phonon Signature of Charge Inhomogeneity in High Temperature Superconductors YBa2Cu3O6+x," arXiv preprint cond-mat/0003414, Cornell University, Oct 2018.
The definitive version is available at https://doi.org/10.48550/arXiv.cond-mat/0003414
Department(s)
Materials Science and Engineering
Document Type
Article - Journal
Document Version
Preprint
File Type
text
Language(s)
English
Publication Date
2018-10-28
Comments
The authors are grateful to A. R. Bishop, V. J. Emery, L. P. Gor’kov, A. Bussmann-Holder, and V. Kresin for useful discussions. The research at University of Pennsylvania was supported by the National Science Foundation through DMR96-28136. Measurements were made at Oak Ridge National Laboratory, which is managed by Lockheed Martin Energy Research under contract no. DE-AC05-96OR22464 for the Department of Energy.