Neutron diffraction study of a layered cobalt oxide SrCo6O11

Takashi Saito, Anthony Williams, J. Paul Attfield, Tuerxun Wuernisha, Takashi Kamiyama, Shintaro Ishiwata, Yuhki Takeda, Yuichi Shimakawa, Mikio Takano

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The magnetic structure of a hexagonal layered cobalt oxide SrCo6O11, which exhibits a 1/3 magnetization plateau and a concomitant large negative megnetoresistance below 20 K, was studied by means of neutron diffraction measurements and Rietveld analysis. It has been found that only the trigonal bipyramidal site carries a localized moment, which corresponds to S = 2, and that the moment has an Ising-like anisotropy along the c-axis. These moments are aligned ferromagnetically in the c-plane, while the interlayer coupling is field dependent. The 1/3 magnetization plateau reflects a field-induced ferrimagnetic alignment along the c-axis like "up-up-down-up-up-down". We interpret this complex spin structure as resulting from competition of an anti ferromagnetic superexchange interaction between the nearest ferromagnetic layers and carrier-mediated, ferromagnetic interactions. (c) 2006 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)1584-1586
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2
DOIs
Publication statusPublished - Mar 2007

Keywords / Materials (for Non-textual outputs)

  • magnetization plateau
  • magnetic structure
  • SrCo6O11
  • TOF neutron diffraction
  • m agnetoresi stance
  • MAGNETIZATION
  • LATTICE

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