Large magnetoresistance in double perovskite Sr2Cr1.2Mo0.8O6-δ

Z. Zeng, I. D. Fawcett, M. Greenblatt, M. Croft

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Sr2Cr1.2Mo0.8O6-δ (δ=0, 0.2) with a double perovskite structure was prepared by solid state reaction in evacuated quartz tubes. Cr and Mo are partially ordered on the B site. Oxygen vacancies decrease the ordering, but increase the lattice parameters. X-ray absorption spectroscopy results are consistent with Cr being 3+, and Mo being close to 5+ for δ = 0.2 and 5.5 for δ = 0. The spin of Cr3+ (d3) and Mo5+ (d1) order in an anti-parallel arrangement by superexchange interaction, and lead to ferrimagnetic ordering below 465 K. Both compounds are n-type narrow gap semiconductors. Large magnetoresistance (-43%) is observed in Sr2Cr1.2Mo0.8O6. The MR behavior is attributed to an intra-grain tunneling mechanism.

Original languageEnglish (US)
Pages (from-to)705-715
Number of pages11
JournalMaterials Research Bulletin
Volume36
Issue number3-4
DOIs
StatePublished - Feb 2001

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • A. Magnetic materials
  • B. Chemical synthesis
  • C. Electronic conductivity
  • C. XANES
  • D. Magnetic properties

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