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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/118/01/0099-0103

    • Keywords

       

      X-ray diffraction; magnetization, magnetoresistance, manganites

    • Abstract

       

      Structural, magnetic and magnetotransport properties of La0.7−xCexBa0.3MnO3 (x = 0–0.4) have been investigated although some unreacted secondary phases of CeO2 were present. The rhombohedral structure (R-3c) forx = 0 transforms to orthorhombic with the space groupImma forx = 0.3. All samples showed ferromagnetic transition above 300 K and a negative magnetoresistance. For x>0.1, magnetization data measured at 1 T showed a decrease at low temperatures (T < 50 K) due to antiferro-magnetic coupling between Ce-local moments and Mn-moments. Forx = 0.4, the resistivity showed a maximum around 200 K which corresponds to ordering temperature of cerium. Since these results are similar to that observed in the Sr-containing La0.5−xCexSr0.5MnO3 (x = 0–0.4) system, we suggest that the cerium ions are in the trivalent state and the anomalous behaviour has been attributed to a Kondo-like effect.

    • Author Affiliations

       

      R Vengadesh Kumara Mangalam1 A Sundaresan1

      1. Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore - 560 064
    • Dates

       
  • Journal of Chemical Sciences | News

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