Doping-induced transition from double exchange to charge order in La1-xCaxMnO3 near x=0.50

M. Roy, J. F. Mitchell, A. P. Ramirez, P. Schiffer

Research output: Contribution to journalArticlepeer-review


We study a series of the perovskite manganite compounds La1-xCaxMnO3 closely spaced in doping near x=0.50 where the ground state undergoes a doping-dependent metal-insulator transition (MIT) from a metallic to a charge-ordered state. A significant difference is found between the value of x and the Mn+4 fraction which defines the metal-insulator phase boundary. In the immediate doping regime of the MIT, the resistivity data can be quantitatively described by a model based on the coexistence of two carrier types: nearly localized carriers in the charge-ordered state exhibiting variable-range hopping and a parasitic population of free carriers which is tunable by either magnetic field or stoichiometry.

Original languageEnglish (US)
Pages (from-to)5185-5188
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
StatePublished - Sep 1 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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