Wide-Range Tuning of the Mo Oxidation State in La1–xSrxFe2/3Mo1/3O3 Perovskites

Sergey Ya Istomin, Varvara V. Chernova, Evgeny V. Antipov, Maxim V. Lobanov, Ivan A. Bobrikov, Viktor Yu Yushankhai, Anatoly M. Balagurov, K. Y. Hsu, J. Y. Lin, J. M. Chen, J. F. Lee, Olga S. Volkova, Alexander N. Vasiliev

Research output: Contribution to journalArticlepeer-review

Abstract

La1–xSrxFe2/3Mo1/3O3(0 ≤ x ≤ 1) perovskites allow exceptionally wide tuning of the Mo oxidation state from +3 (x = 0) to +6 (x = 1) with the FeIIIoxidation state virtually unchanged. The end members of this series show antiferromagnetic ordering in LaFe2/3Mo1/3O3at TN= 520 K and ferrimagnetic ordering in SrFe2/3Mo1/3O3at TC= 420 K. The crucial role of electron correlations in the Mo 4d shell suggests that LaFe2/3Mo1/3O3with a half-filled band is a Mott insulator, whereas SrFe2/3Mo1/3O3is a band insulator. In both cases, the magnetic structure is dictated by antiferromagnetic superexchange between localized magnetic moments. At intermediate compositions, an interplay of antiferromagnetic-superexchange and double-exchange interactions results in nonmonotonous variations of both the magnetic-ordering temperature and saturation magnetization.

Original languageEnglish
Pages (from-to)2942-2951
Number of pages10
JournalEuropean Journal of Inorganic Chemistry
Volume2016
Issue number18
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • Iron
  • Magnetic properties
  • Molybdenum
  • Perovskite phases

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