Evolution of structure and magnetic properties in electron-doped double perovskites, Sr2-xLaxMnWO6 (0≤x≤1)

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Abstract

Powder neutron and X-ray diffraction studies show that the double perovskites in the region 0≤x≤1 exhibit two crystallographic modifications at room temperature: monoclinic P21/n and tetragonal I4/m, with a boundary at 0.75<x<0.9. Magnetic susceptibility measurements indicate that for x=0 and 0.5 Sr2-xLaxMnWO6 orders antiferromagnetically (AFM) at 15 and 25 K, respectively, for 0.75≤x<1.0, a contribution of weak ferromagnetism (FM), probably due to canted-AFM order, increases with increasing x. The end point compound SrLaMnWO6 shows the strongest FM cluster effect; however, no clear evidence of magnetic order is discernable down to 4.2 K. X-ray absorption spectroscopy (XAS) confirms Mn 2+ and mixed-valent W6+/5+ formal oxidation states in Sr2-xLaxMnWO6.

Original languageEnglish (US)
Pages (from-to)1356-1366
Number of pages11
JournalJournal of Solid State Chemistry
Volume178
Issue number5
DOIs
StatePublished - May 1 2005

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

Keywords

  • Double perovskite
  • Magnetic properties
  • Neutron diffraction
  • SrLaMnWO
  • Structure

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