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    • Keywords

       

      Metal-nonmetal transition; perovskite oxides; mixed valency; giant magnetoresistance

    • Abstract

       

      Magnetoresistance (MR) in bulk samples of LaMnO3 has been investigated by varying the Mn4+ content from 10 to 33 per cent by chemical means, without aliovalent doping. With the increase in Mn4+ content, the structure of LaMnO3 changes first from orthorhombic to rhombohedral and then to cubic and the material becomes increasingly ferromagnetic, exhibiting a resistivity maximum akin to an insulator-metal transition atTPeak, just below the ferromagneticTc. The magnitude of MR is highest in the cubic sample (with 33% Mn4+) around theTPeak, and negligible in the non-magnetic orthorhombic sample (12% Mn4+).

    • Author Affiliations

       

      R Mahendiran1 R Mahesh2 A K Raychaudhuri1 C N R Rao2

      1. Department of Physics, Indian Institute of Science, Bangalore - 560 012, India
      2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore - 560 012, India
    • Dates

       
  • Pramana – Journal of Physics | News

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