Systematic studies on effects of cationic ordering on structural and magnetic properties in Sr2 FeMoO6

Y. H. Huang*, M. Karppinen, H. Yamauchi, J. B. Goodenough

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

57 Citations (Scopus)

Abstract

Sr2 FeMoO6 samples with various degrees of Fe, Mo ordering were prepared from a sol-gel-derived precursor with a sample-encapsulation technique. The order parameter ξ for Fe and Mo, determined by Rietveld refinement, ranged from 0.56 to 0.95. Structural data suggest that the equilibration reaction FeIII + MoV = FeII + MoVI is shifted toward the left by the trapping of minority-spin electrons in Mo-rich trap states for ξ<0.7 and that it is shifted toward the right at a transition from polaronic to itinerant minority-spin electrons at ξ0.9. In accord with a first-order polaronic-itinerant electronic transition, well-ordered itinerant-electron regions appear to be nucleated and to grow in a partially ordered matrix until they meet at antiphase boundaries. This heterogeneous development is at odds with models of homogeneous site disorder with a constant oxidation state of the Fe and Mo atoms.

Original languageEnglish
Article number104408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number10
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

Fingerprint Dive into the research topics of 'Systematic studies on effects of cationic ordering on structural and magnetic properties in Sr2 FeMoO6'. Together they form a unique fingerprint.

Cite this