Orbital and Charge Ordering in La1-xSr1+xMnO4 (0.4≤x ≤0.5)
Orbital and Charge Ordering in La1-xSr1+xMnO4 (0.4≤x ≤0.5)
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La1-xSr1+xMnO4 (0.4≤x ≤0.5) 中的轨道和电荷排序
DOI：
10.1143/jpsj.70.1194
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发表时间：
2001
影响因子：
1.7
通讯作者：
N. Wakabayashi
中科院分区：
文献类型：
--
作者：
Y. Wakabayashi;Y. Murakami;Y. Moritomo;I. Koyama;H. Nakao;T. Kiyama;T. Kimura;Y. Tokura;N. Wakabayashi
用共振X射线散射技术研究了层状钙钛矿化合物La 1-xSr 1+ xMnO 4中空穴浓度与电荷序（CO）和轨道序（OO）的关系。在空穴浓度x在0.5 ~ 0.48之间的化合物中，在210 K以下观察到CO和OO，但当x ≤0.46时，两者都没有观察到。转变温度在0.5 ~ 0.48之间几乎与x无关。从超晶格峰形分析得到的两个阶的相关长度在任何温度下都是有限的。此外，与立方钙钛矿相反，OO的ε大于CO的ε。在x =0.48的临界浓度下，OO的ε与CO的ε一样短。这些结果表明，OO是该体系中CO生成的先决条件。
Hole concentration dependence of charge order (CO) and orbital order (OO) in layered perovskite compounds La 1- x Sr 1+ x MnO 4 has been studied by means of the resonant X-ray scattering technique. Both CO and OO are observed below 210 K in the compounds having the hole concentration x between 0.5 and 0.48, but neither is observed for x ≤0.46. The transition temperatures are nearly independent of x between 0.5 and 0.48. Correlation lengths ξ's for both orders obtained from analyses of superlattice peak profiles are finite at any temperature. Moreover, in contrast to the cubic perovskite, ξ for OO is larger than that for CO. ξ for OO is as short as that for CO at the critical concentration of x =0.48. These results suggest that OO is prerequisite to the forming of CO in this system.