Existence of orbital polarons in ferromagnetic insulating La${}_{1-x}$Sr${}_x$MnO${}_3$ (0.11$<x<$0.14) evidenced by giant phonon softening

Abstract

We present an inelastic light scattering study of single crystalline (La${}_{1-y}$Pr${}_y$)${}_{1-x}$Sr${}_x$MnO${}_3$ ($0\le x\le 0.14$,$y=0$ and $x=1/8$,$0\le y\le 0.5$). A giant softening up to 20 - 30 cm${}^{-1}$ of the Mn-O breathing mode has been observed only for the ferromagnetic insulating (FMI) samples ($0.11\le x\le 0.14$) upon cooling below the Curie temperature. With increasing Pr-doping the giant softening is gradually suppressed. This is attributed to a coupling of the breathing mode to orbital polarons which are present in the FMI phase.

4 pages, 5 figures

References in corpus (1)

• Orbital excitations in LaMnO${}_3$

Cited by in corpus (5)

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• Anomalous low-energy phonons in nearly tetragonal BiFeO3 thin films
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• Raman evidence for Orbiton-Mediated Multiphonon Scattering in Multiferroic TbMnO${}_3$
• Anomalous multi-order Raman scattering in LaMnO_3: a signature of a quantum lattice effect in a Jahn-Teller crystal