Abstract
Resonant inelastic x-ray scattering at the N edge reveals clearly resolved harmonics of the anion plane vibrations in the -(BEDT-( spin-liquid insulator. Tuning the incoming light energy at the edge of two distinct N sites permits us to excite different sets of phonon modes. The cyanide (CN) stretching mode is selected at the edge of the ordered N sites which are more strongly connected to the bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) molecules, while positionally disordered N sites show multimode excitation. Combining measurements with calculations on an anion plane cluster permits us to estimate the site-dependent electron-phonon coupling of the modes related to nitrogen excitation.
4 More- Received 27 July 2017
DOI:https://doi.org/10.1103/PhysRevB.96.184303
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