New type of charge/orbital ordering above room temperature in the perovskite Bi2/3Sr1/3MnO3
New type of charge/orbital ordering above room temperature in the perovskite Bi2/3Sr1/3MnO3
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钙钛矿 Bi2/3Sr1/3MnO3 中室温以上的新型电荷/轨道排序
DOI：
10.1021/cm021309f
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
B. Raveau
中科院分区：
文献类型：
--
作者：
M. Hervieu;S. Malo;O. Pérez;P. Beran;C. Martin;G. Baldinozzi;B. Raveau
电子显微镜研究表明，在富Mn 3+的钙钛矿结构Bi 2/3Sr 1/3 MnO 3中存在一种新型的电荷有序结构，其稳定性可达T1500 K.这种新的超结构，基于Imma型子细胞，其特征在于双调制与a = 2a p 2，B = 4a p，c = a p 2。X-射线粉末衍射证明了在T2 580 K的第二个结构转变，并建议低于T2的氧原子的位移调制。这些结果被解释为在500 K以下，氧原子的电荷轨道有序和调制位移有序以双Mn条带的形式相关共存。
A new type of charge ordering stable up to T 1 500 K has been evidenced by electron microscopy in the Mn 3+ -rich perovskite Bi 2/3 Sr 1/3 MnO 3 . This new superstructure, based on a Imma-type subcell is characterized by a double modulation with a = 2a p √2, b = 4a p , c = a p √2. X-ray powder diffraction evidences a second structural transition at T 2 580 K and suggests a displacive modulation of the oxygen atoms below T 2 . These results are interpreted as the correlated coexistence of charge-orbital ordering and modulated displacive ordering of oxygen atoms, in the form of double Mn stripes, below 500 K.