Hole stripe and orbital fluctuating state in LaMnO$_{3+δ}$ ($0.085\leq δ\leq0.125$) unveiled by Raman spectroscopy

Details Hole stripe and orbital fluctuating state in LaMnO$_{3+δ}$ ($0.085\leq δ\leq0.125$) unveiled by Raman spectroscopy Hole stripe and orbital fluctuating state in LaMnO$_{3+δ}$ ($0.085\leq δ\leq0.125$) unveiled by Raman spectroscopy

2005-06-13

arxiv.org/abs/cond-mat/0506258v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, 1 table

Scientific paper

Giant softening by 30 cm$^{-1}$ of the 490- and 620-cm$^{-1}$ modes is observed by Raman scattering measurements below the Curie temperature of single crystalline LaMnO$_{3+\delta}$ ($0.085\leq \delta\leq0.125$). A pseudogap-like electronic continuum and a Fano antiresonance at 144 cm$^{-1}$ appear below the charge ordering temperature. This gives evidence for the presence of an orbital fluctuating state and the formation of a hole stripe, respectively. This is further corroborated by a unstructured broadening and shifting of multiphonon features with increasing doping $\delta$. Our study suggests the significance of double exchange mechanism in the charged ordered insulating state.

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