Orbiton-mediated multi-phonon scattering in La${}_{1-x}$Sr${}_x$MnO${}_3$

Abstract

We report on Raman scattering measurements of single crystalline La${}_{1-x}$Sr${}_x$MnO${}_3$ ($x$=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.

6pages, 6figures, submitted to PRB

References in corpus (4)

• Orbital excitations in LaMnO${}_3$
• Re-examination of orbital ordering in LaMnO${}_3$: Electron-electron and electron-lattice interactions
• Existence of orbital polarons in ferromagnetic insulating La${}_{1-x}$Sr${}_x$MnO${}_3$ (0.11$<x<$0.14) evidenced by giant phonon softening
• Theory of Raman Scattering from Orbital Excitations in Manganese Oxides

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• Anomalous multi-order Raman scattering in LaMnO_3: a signature of a quantum lattice effect in a Jahn-Teller crystal
• Low temperature mixed spin state of Co3+ in LaCoO3 evidenced from Jahn-Teller lattice distortions
• Coupled spin-lattice fluctuations in a compound with orbital degrees of freedom: the Cr based dimer system Sr3Cr2O8