Orbiton-mediated multiphonon scattering in La1-xSrxMnO3 -: art. no. 024301

We report on Raman scattering measurements of single crystalline La1-xSrxMnO3 (x=0, 0.06, 0.09, and 0.125), focusing on the high-frequency regime. We observe multiphonon scattering processes up to fourth order which show distinct features: (i) anomalies in peak energy and its relative intensity and (ii) a pronounced temperature, polarization, and doping dependence. These features suggest a mixed orbiton-phonon nature of the observed multiphonon Raman spectra.