TY - JOUR
T1 - Anomalous double-stripe charge ordering in β- NaFe2 O3 with double triangular layers consisting of almost perfect regular Fe4 tetrahedra
AU - Kobayashi, Shintaro
AU - Ueda, Hiroaki
AU - Michioka, Chishiro
AU - Yoshimura, Kazuyoshi
AU - Nakamura, Shin
AU - Katsufuji, Takuro
AU - Sawa, Hiroshi
N1 - Funding Information:
The authors thank S. Kawaguchi, A. Nakano, and S. Kitou for supporting the SR-XRD measurements, M. Imai for supporting the analysis of NMR data, and N. Katayama for helpful discussion. This work was partially carried out using the facilities of Research Center for Low Temperature and Materials Sciences, Kyoto University. The synchrotron radiation experiments were performed at the BL02B2 of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2016A1620 and 2016B1437). This work was supported by JSPS KAKENHI Grants No. 14J01400, No. 16J04046, and No. 16H04131. The figures of crystal structure were created using VESTA . Rietveld analyses were conducted using the GSAS program .
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/5/7
Y1 - 2018/5/7
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevMaterials.2.054402
DO - 10.1103/PhysRevMaterials.2.054402
M3 - Article
AN - SCOPUS:85059645191
SN - 2475-9953
VL - 2
JO - Physical Review Materials
JF - Physical Review Materials
IS - 5
M1 - 054402
ER -