Enhancement of magnetic ordering temperature in iron substituted ytterbium manganate (YbMn1-xFexO3)

S. L. Samal, T. Magdaleno, K. V. Ramanujachary, S. E. Lofland, A. K. Ganguli

Research output: Contribution to journalArticle

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Abstract

Oxides of the type YbMn1-xFexO3; x≤0.3 showing multiferroic behavior have been synthesized by the solid state route. These oxides crystallize in the hexagonal structure known for the parent YbMnO3 with the c/a ratio increasing with Fe substitution. The distortion of the MnO5 polyhedra (tbp) decreases and the Mn-O-Mn bonds in the a-b plane become shorter with Fe-substitution. Magnetic ordering is observed from the low temperature neutron diffraction study. The compounds were found to be antiferromagnetic and the ordering temperature TN increased from 82 K for pure YbMnO3 to 95 K for YbMn0.7Fe0.3O3. Variable temperature dielectric measurements (15-110 K) show an anomaly in the dielectric constant at temperatures close to the antiferromagnetic ordering temperature for all the compositions, showing a unique correlation between the magnetic and electric field. The increase in the ordering temperature in YbMn1-xFexO3 is explained on the basis of increase in covalence of Mn/Fe-O-Mn/Fe bonds (shorter) with iron substitution.

Original languageEnglish (US)
Pages (from-to)643-648
Number of pages6
JournalJournal of Solid State Chemistry
Volume183
Issue number3
DOIs
StatePublished - Mar 1 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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