Competition of charge, orbital, and ferromagnetic correlations in layered manganites
arXiv:cond-mat/0007082 · doi:10.1103/PhysRevB.63.132404
Abstract
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.
10 pages, 4 figures