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Influence of hole carrier density and sintering temperature on the electronic properties of magnetoresistive La0.7Pb0.3Mn1⊟xRuxO3 (0.0 ≤ x ≤x 0.4)

Published online by Cambridge University Press:  31 January 2011

Ranjan Kumar Sahu ,
Manju Lata Rao ,
Solomon Sundar Manoharan ,
Dieter Elefant ,
Peter Verges  and
Claus M. Schneider
Ranjan Kumar Sahu
Affiliation:
Materials Chemistry Laboratory, Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh-208 016, India
Manju Lata Rao
Affiliation:
Materials Chemistry Laboratory, Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh-208 016, India
Solomon Sundar Manoharan*
Affiliation:
Materials Chemistry Laboratory, Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh-208 016, India
Dieter Elefant
Affiliation:
Institute for Solid State and Materials Research Dresden, Helmholtz Straße 20, D-01069, Dresden, Germany
Peter Verges
Affiliation:
Institute for Solid State and Materials Research Dresden, Helmholtz Straße 20, D-01069, Dresden, Germany
Claus M. Schneider
Affiliation:
Institute for Solid State and Materials Research Dresden, Helmholtz Straße 20, D-01069, Dresden, Germany
*
b)Address all correspondence to this author.ssundar@iitk.ac.in
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Abstract

A novel magnetic pair-making interaction between Mn and Ru shows a strong correlation between the magnetic ordering and electronic transport, which was well exemplified in the investigation of bulk polycrystalline samples of La0.7Pb0.3Mn1⊟xRuxO3 and La0.6Pb0.4Mn1⊟xRuxO3, where 0.0 ≤ x ≤ 0.4. The metal-insulator transition (Tρ) complementing the Curie temperature (Tc) was observed up to 30% of Ru in La0.7Pb0.3Mn1⊟xRuxO3, and extended up to 40% of Ru in La0.6Pb0.4Mn1⊟xRuxO3, showing a unique double-exchange ferromagnetic exchange interaction between Mn and Ru ions. An upturn in resistance due to charge carrier localization at low temperatures (T<0.5 Tc) for more than 20% Ru doping was due to a dominant hole carrier density contribution rather than to grain boundary effects as inferred from the scanning electron microscopy and energy dispersive x-ray studies of the samples sintered at 1200 and 1400 °C. The charge localization effect of the eg electrons was removed by tuning the hole carrier density as demonstrated in the La0.6Pb0.4Mn1⊟xRuxO3 samples. Long range correlations between magnetism and transport in this series was attributed to the presence of mixed valence Ru(IV/V) and Mn(III)/(IV) pair, which shows a unique double exchange mediated interaction.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 12 , December 2002 , pp. 3090 - 3097
Copyright
Copyright © Materials Research Society 2002

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