Two Types of Charge Ordering in the Half-Doped Manganites of Bi0.5(Ca,Sr)0.5MnO3
Two Types of Charge Ordering in the Half-Doped Manganites of Bi0.5(Ca,Sr)0.5MnO3
复制标题
Bi0.5(Ca,Sr)0.5MnO3 半掺杂锰氧化物中两种类型的电荷排序
DOI：
10.1143/jpsj.78.044704
复制
发表时间：
2009
影响因子：
1.7
通讯作者：
S. Cheong
中科院分区：
文献类型：
--
作者：
Y. Horibe;J. Ahn;P. Sharma;S. Mori;C. H. Chen;Se;S. Cheong
通过对Bi0.5Ca0.5-xSrxMnO3(x=0-0.5)中电荷有序随化学压力变化的研究，我们发现了两种不同的电荷有序方案的具体性质，它们与x=0.2-0.2 5时从Pnma-型对称性到ImMa型对称性的结构变化有关。X=0-0.2(Pnma)的电荷有序与半掺杂锰氧化物中常见的棋盘式模式一致。另一方面，x=0.25-0.5(I M M A)的大容差系数稳定了双条电荷排序方案。这些发现表明了两个相互竞争的电荷有序态的双临界性质，并为理解半掺杂锰氧化物中的主要电荷有序机制提供了进一步的见解。
From our study of the evolution of charge ordering in Bi 0.5 Ca 0.5- x Sr x MnO 3 ( x = 0–0.5) with chemical pressure, we found the detailed nature of two distinct charge ordering schemes, associated with the structural change from P n m a - to I m m a -type symmetry at x = 0.2–0.25. Charge ordering for x = 0–0.2 ( P n m a ) is consistent with the checkerboard-type pattern, commonly observed in half-doped manganites. On the other hand, a large tolerance factor for x = 0.25–0.5 ( I m m a ) stabilizes a double-stripe charge ordering scheme. These findings indicate the bicritical nature of two competing charge ordered states and provide further insight towards understanding the dominant charge ordering mechanism in half-doped manganites.