Charge ordering and magnetoresistance of (formula presented)

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Abstract

The two-electron (formula presented) doped (formula presented) (formula presented) system was prepared by sol-gel method and investigated by x-ray absorption spectroscopy (XAS), X-ray diffraction, and temperature and field dependent magnetic and transport measurements. The results are compared in detail to the one-electron (formula presented)-doped (formula presented) system, facilitated by the analogous (formula presented) parametrization as (formula presented) (formula presented) The XAS results indicate: that the formal valence of cerium is (formula presented) thereby validating the charge transfer of (formula presented) per doped Ce to Mn. The XAS also shows separate (formula presented) and (formula presented) spectral components, in dramatic contrast to results on (formula presented)-doped systems. Low Ce doping (formula presented) and 0.05) rapidly stabilizes a robust ferromagnetic component in addition to a persistent antiferromagnetic component in the ordered state. Higher Ce doping (formula presented) induces a charge/orbital ordering transition that increases with composition to near 255 K. In different composition ranges the magnetoresistance manifests inter-grain-tunneling and a field coupling of the local charge/orbital order parameter mechanisms. The latter mechanism appears to induce a large magnetoresistance, as high as -72%, in (formula presented)

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number22
DOIs
StatePublished - 2001

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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