Anomalous double-stripe charge ordering in β-NaFe2O3 with double triangular layers consisting of almost perfect regular Fe4 tetrahedra
Anomalous double-stripe charge ordering in β-NaFe2O3 with double triangular layers consisting of almost perfect regular Fe4 tetrahedra
复制标题
β-NaFe2O3 中的反常双带电荷排序，具有由几乎完美的规则 Fe4 四面体组成的双三角形层
DOI：
10.1103/physrevmaterials.2.054402
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发表时间：
2018
影响因子：
3.4
通讯作者：
and Hiroshi Sawa
中科院分区：
文献类型：
--
作者：
Shintaro Kobayashi;Hiroaki Ueda;Chishiro Michioka;Kazuyoshi Yoshimura;Shin Nakamura Takuro Katsufuji;and Hiroshi Sawa
采用同步辐射X射线衍射、磁化强度、电阻率、差示扫描量热、核磁共振等测试手段对混合价氧化铁的物理性质进行了研究。该化合物具有由几乎完美的正四面体组成的双三角层，这表明几何挫折。我们发现该化合物呈现静电不稳定的双条纹型电荷有序，这种有序是通过八面体的协同压缩来稳定的，这是由于Jahn-Teller畸变引起的价态变化和八面体。我们的研究结果表明，在强电荷阻挫区的电荷有序的电子-声子耦合的重要性。
The physical properties of the mixed-valent iron oxidewere investigated by means of synchrotron radiation x-ray diffraction, magnetization, electrical resistivity, differential scanning calorimetry,NMR, andmeasurements. This compound has double triangular layers consisting of almost perfect regulartetrahedra, 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 ofoctahedra, owing to a valence change andoctahedra due to Jahn-Teller distortion. Our results indicate the importance of electron-phonon coupling for charge ordering in the region of strong charge frustration.