Vibronic coupling and band gap trends in CuGeO3 nanorods

Source Publication (e.g., journal title)

Physical Review B

Authors

Kenneth Robert O'NealFollow
Amal al-Wahish, University of Tennessee, Knoxville
Z Li, National High Magnetic Field Laboratory
P Chen, University of Tennessee, Knoxville
J W. Kim, Nanjing University, China
Sang-Wook Cheong, Pohang University of Science and Technology, Korea
G Dhalenne, Universite Paris-Sud
A Revcolevschi, Universite Paris Sud (Paris XI)
X-T Chen, Nanjing University, China
Janice L. Musfeldt, University of Tennessee, Knoxville

Document Type

Article

Publication Date

8-28-2017

DOI

10.1103/PhysRevB.96.075437

Abstract

We measured the optical response of CuGeO3 nanorods in order to reveal size effects on the electronic properties. The vibronically activated d-to-d color band excitations are activated by the 131 and 478 cm−1 phonons, with the relative contribution of the lower frequency O-Cu-O bending mode increasing with decreasing size until it dominates the process. We also uncover trends in the direct band gap, with the charge transfer edge hardening with decreasing size. These findings advance the understanding of size effects in low-dimensional copper oxides.

Recommended Citation

O'Neal, Kenneth Robert; al-Wahish, Amal; Li, Z; Chen, P; Kim, J W.; Cheong, Sang-Wook; Dhalenne, G; Revcolevschi, A; Chen, X-T; and Musfeldt, Janice L., "Vibronic coupling and band gap trends in CuGeO3 nanorods" (2017). Chemistry Publications and Other Works.
https://trace.tennessee.edu/utk_chempubs/53

Submission Type

Post-print