Probing anisotropic magnetotransport in manganese perovskites using Raman spectroscopy

H. Liu, S. Yoon, S. Cooper, S. W. Cheong

Research output: Contribution to journalArticlepeer-review

Abstract

We report an electronic Raman scattering study of the colossal magnetoresistance (CMR) manganese perovskites as a function of temperature, magnetic field, symmetry, and doping. The low-frequency electronic Raman spectrum in the paramagnetic-insulating phase of these materials is characterized by a diffusive Raman-scattering response, while a nearly flat continuum response is observed in the ferromagnetic-metallic state. We found that the (Formula presented)-symmetry electronic scattering intensity is significantly reduced with applied magnetic field near (Formula presented) in a manner reminiscent of the dc magnetoresistivity. The strongly field-dependent scattering rate in the (Formula presented) channel appears to reflect the highly field-dependent mobility along the Mn-O bond direction expected in the double exchange mechanism. In addition, we observe a persistent field dependence in the (Formula presented) electronic scattering response for (Formula presented) suggesting that the ferromagnetic phase is inhomogeneous, perhaps consisting of both metallic and insulating components.

Original languageEnglish
Pages (from-to)R10115-R10118
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume58
Issue number16
DOIs
Publication statusPublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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