Source Publication (e.g., journal title)
The Journal of Chemical Physics
We report the discovery of finite length scale effects on vibronic coupling in nanoscale α-Fe2O3 as measured by the behavior of vibronically activated d-d on-site excitations of Fe3+ as a function of size and shape. An oscillator strength analysis reveals that the frequency of the coupled symmetry-breaking phonon changes with size, a crossover that we analyze in terms of increasing three-dimensional character to the displacement pattern. These findings demonstrate the flexibility of mixing processes in confined systems and suggest a strategy for both enhancing and controlling charge-lattice interactions in other materials.
O'Neal, Kenneth Robert; Patete, J M.; Chen, P; Holinsworth, Brian S.; Smith, J M.; Cheong, Sang-Wook; Wong, S S.; Marques, C; Aronson, M C.; and Musfeldt, Janice L., "Size-dependent vibronic coupling in α-Fe2O3" (2014). Chemistry Publications and Other Works.