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Structural distortions and magnetisms in Fe-doped LaMn1-xFexO 3 (0< x ≤ 0.6) |
Zheng Long (郑龙), Wu Xiao-Shan (吴小山) |
Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China |
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Abstract 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 0.2~0.3. 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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Received: 21 March 2013
Revised: 19 April 2013
Accepted manuscript online:
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PACS:
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78.70.Dm
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(X-ray absorption spectra)
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36.40.Cg
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(Electronic and magnetic properties of clusters)
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61.05.cp
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(X-ray diffraction)
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Fund: Project supported by the State Key Program for Basic Research of China (Grant No. 2010CB923404) and the National Natural Science Foundation of China (Grant Nos. 11274153, 11204124, and 51202108). |
Corresponding Authors:
Wu Xiao-Shan
E-mail: xswu@nju.edu.cn
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Cite this article:
Zheng Long (郑龙), Wu Xiao-Shan (吴小山) Structural distortions and magnetisms in Fe-doped LaMn1-xFexO 3 (0< x ≤ 0.6) 2013 Chin. Phys. B 22 107806
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