Structural distortions and magnetisms in Fe-doped LaMn1-xFexO3 (0 < x ≤ 0.6)

被引：11
|
作者：
Zheng Long
Wu Xiao-Shan [1 ]
机构：
[1] Nanjing Univ, Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
来源：
CHINESE PHYSICS B | 2013年 / 22卷 / 10期
基金：
中国国家自然科学基金;
关键词：
structural distortion; X-ray absorption; phase transition; TRANSPORT-PROPERTIES; SUBSTITUTION;
D O I：
10.1088/1674-1056/22/10/107806
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
X-ray absorption spectra (XAS) at Mn K-edge and Fe K-edge in LaMn1-xFexO3 show that with the increase of Fe substitution the chemical valence of Mn4+ decreases, while the chemical valence of Fe3+ remains unchanged. Structural distortions, such as the rotating and tilting for oxygen octahedron in the unit cell vary with iron content. A phase transition occurs at the Fe content values of 0.2 similar to 0.3. The evolutions of rotation and tilting angle of FeO6/MnO6 octahedral may be the vital factors to the structure and magnetism. We believe that the spin configuration of Fe3+ may vary from the intermediate spin t(2g)(4)e(g)(1) (S = 3/2) to the higher spin t(32g)e(g)(2) (S = 5/2) near the phase transition.
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收藏
页数：4
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