Orbiton-mediated multi-phonon scattering in La$_{1-x}$Sr$_x$MnO$_3$
K.-Y. Choi, P. Lemmens, G. G\"untherodt, Yu. G. Pashkevich, V. P., Gnezdilov, P. Reutler, L. Pinsard-Gaudart, B. B\"uchner, and A. Revcolevschi
TL;DR
This study investigates high-frequency Raman scattering in La$_{1-x}$Sr$_x$MnO$_3$, revealing multi-phonon processes with orbiton-phonon interactions that depend on temperature, polarization, and doping levels.
Contribution
It provides the first detailed analysis of multi-phonon scattering up to fourth-order in La$_{1-x}$Sr$_x$MnO$_3$, highlighting orbiton-phonon coupling effects.
Findings
Observation of multi-phonon scattering up to fourth-order.
Anomalies in peak energy and intensity related to orbiton-phonon interactions.
Strong dependence of spectra on temperature, polarization, and doping.
Abstract
We report on Raman scattering measurements of single crystalline LaSrMnO (=0, 0.06, 0.09 and 0.125), focusing on the high frequency regime. We observe multi-phonon 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 multi-phonon Raman spectra.
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