Competition of charge, orbital, and ferromagnetic correlations in layered manganites

Physics – Condensed Matter – Strongly Correlated Electrons

Scientific paper

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10 pages, 4 figures

Scientific paper

10.1103/PhysRevB.63.132404

The competition of charge, orbital, and ferromagnetic interactions in layered manganites is investigated by magneto-Raman scattering spectroscopy. We find that the colossal magnetoresistance effect in the layered compounds results from the interplay of the orbital and ferromagnetic double-exchange correlations. Inelastic scattering by charge-order fluctuations dominates the quasiparticle dynamics in the ferromagnetic-metal state. The scattering is suppressed at low frequencies, consistent with the opening of a charge-density wave pseudogap.

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