Anomalous double-stripe charge ordering in β- NaFe2 O3 with double triangular layers consisting of almost perfect regular Fe4 tetrahedra

Shintaro Kobayashi, Hiroaki Ueda, Chishiro Michioka, Kazuyoshi Yoshimura, Shin Nakamura, Takuro Katsufuji, Hiroshi Sawa

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1 Citation (Scopus)

Abstract

The physical properties of the mixed-valent iron oxide β-NaFe2O3 were investigated by means of synchrotron radiation x-ray diffraction, magnetization, electrical resistivity, differential scanning calorimetry, Na23 NMR, and Fe57Mössbauer measurements. This compound has double triangular layers consisting of almost perfect regular Fe4 tetrahedra, which suggests geometrical frustration. We found that this compound exhibits an electrostatically unstable double-stripe-type charge ordering, which is stabilized by the cooperative compression of Fe3+O6 octahedra, owing to a valence change and Fe2+O6 octahedra due to Jahn-Teller distortion. Our results indicate the importance of electron-phonon coupling for charge ordering in the region of strong charge frustration.

Original languageEnglish
Article number054402
JournalPhysical Review Materials
Volume2
Issue number5
DOIs
Publication statusPublished - 2018 May 7

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

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