Abstract
We identify excitations in the quasi-one-dimensional compound CaYCuO using resonant inelastic x-ray scattering. By tuning across the Cu edge, we observe abrupt shifts in the -peak positions as a function of incident photon energy. This observation demonstrates orbital-specific coupling of the high-energy excited states of the system to the low-energy degrees of freedom. A Franck-Condon treatment of electron-lattice coupling, consistent with other measurements in this compound, reproduces these shifts, explains the Gaussian line shapes, and highlights charge-orbital-lattice renormalization in the high-energy manifold.
- Received 20 November 2013
- Revised 9 December 2013
DOI:https://doi.org/10.1103/PhysRevB.89.041104
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