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Competition of Charge, Orbital, and Ferromagnetic Correlations in Layered Manganites

Published

Author(s)

D B. Romero, Y Moritomo, J.F. Mitchell, H D. Drew

Abstract

We investigated the competition of charge, orbital, and ferromagnetic interactions in layered manganites by magneto-Raman scattering spectroscopy. The charge-order insulator LaSr2Mn207 reveals the phononic signatures of charge and orbital ordering which co-exist with double-exchange in the colossal magnetoresistance (CMR)compound La1.2Sr1.8Mn207. The CMR effect is a balance between the orbital and ferromagnetic correlations. A strong incoherent 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 and suggestive of non-Fermi liquid behavior.
Citation
Physical Review B (Condensed Matter and Materials Physics)
Volume
63
Issue
No. 13

Keywords

charge ordering, ferromagnetic-metal, layered manganites, non-Fermi liquid, orbital ordering, quantum criticality, Raman spectroscopy

Citation

Romero, D. , Moritomo, Y. , Mitchell, J. and Drew, H. (2001), Competition of Charge, Orbital, and Ferromagnetic Correlations in Layered Manganites, Physical Review B (Condensed Matter and Materials Physics) (Accessed March 4, 2024)
Created April 1, 2001, Updated February 17, 2017