| Structural distortions and magnetisms in Fe-doped LaMn1-xFexO3 （0 〈 x ≤0.6） |
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| 引用本文： | 郑龙,吴小山.Structural distortions and magnetisms in Fe-doped LaMn1-xFexO3 （0 〈 x ≤0.6）[J].中国物理 B,2013(10):563-566. |
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| 作者姓名： | 郑龙 吴小山 |
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| 作者单位： | Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China |
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| 基金项目： | Project supported by the State Key Program for Basic Research of China (Grant No.2010CB923404);the National Natural Science Foundation of China (Grant Nos.11274153,11204124,and 51202108) |
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| 摘 要： | X-ray absorption spectra （XAS） at Mn K-edge and Fe K-edge in LaMnl-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 0.2~0.3. 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 t2g4eg1 （S = 3/2） to the higher spin t2g3eg2 （S = 5/2） near the phase transition.
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| 关 键 词： | Fe 结构 扭曲 X射线吸收光谱 掺杂 磁矩 化学价态 八面体 |
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