Source Publication (e.g., journal title)
We combine infrared and Raman spectroscopies to investigate finite length scale effects in CuGeO3 nanorods. The infrared-active phonons display remarkably strong size dependence whereas the Raman-active features are, by comparison, nearly rigid. A splitting analysis of the Davydov pairs reveals complex changes in chemical bonding with rod length and temperature. Near the spin-Peierls transition, stronger intralayer bonding in the smallest rods indicates a more rigid lattice which helps to suppress the spin-Peierls transition. Taken together, these findings advance the understanding of size effects and collective phase transitions in low-dimensional oxides.
O'Neal, Kenneth Robert; al-Wahish, Amal; Li, Z-Q; Dhalenne, G; Revcolevschi, A; Chen, X-T; and Musfeldt, Janice L., "Charge and Bonding in CuGeO3 Nanorods" (2018). Chemistry Publications and Other Works.