Charge and Bonding in CuGeO<sub>3</sub> Nanorods.
basic_science · Level V
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- Record sourced from PubMed, PMID 29727571.
- Also identified by DOI 10.1021/acs.nanolett.8b00407.
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Abstract
We combine infrared and Raman spectroscopies to investigate finite length scale effects in CuGeO<sub>3</sub> 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.