Structural distortions and magnetisms in Fe-doped LaMn1-xFexO 3 (0x ≤ 0.6)

doi:10.1088/1674-1056/22/10/107806

中国物理B ›› 2013, Vol. 22 ›› Issue (10): 107806-107806.doi: 10.1088/1674-1056/22/10/107806

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Structural distortions and magnetisms in Fe-doped LaMn_1-xFe_xO₃ (0< x ≤ 0.6)

郑龙, 吴小山

Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China

收稿日期:2013-03-21 修回日期:2013-04-19 出版日期:2013-08-30 发布日期:2013-08-30
基金资助:
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).

Structural distortions and magnetisms in Fe-doped LaMn_1-xFe_xO₃ (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

Received:2013-03-21 Revised:2013-04-19 Online:2013-08-30 Published:2013-08-30
Contact: Wu Xiao-Shan E-mail:xswu@nju.edu.cn
Supported by:
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).

摘要/Abstract

摘要： X-ray absorption spectra (XAS) at Mn K-edge and Fe K-edge in LaMn_1-xFe_xO₃ 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 t_2g⁴e_g¹ (S=3/2) to the higher spin t_2g³e_g² (S=5/2) near the phase transition.

关键词: structural distortion, X-ray absorption, phase transition

Abstract: X-ray absorption spectra (XAS) at Mn K-edge and Fe K-edge in LaMn_1-xFe_xO₃ 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 t_2g⁴e_g¹ (S=3/2) to the higher spin t_2g³e_g² (S=5/2) near the phase transition.

Key words: structural distortion, X-ray absorption, phase transition

中图分类号: (X-ray absorption spectra)

78.70.Dm

36.40.Cg (Electronic and magnetic properties of clusters) 61.05.cp (X-ray diffraction)

郑龙, 吴小山. Structural distortions and magnetisms in Fe-doped LaMn_1-xFe_xO₃ (0< x ≤ 0.6)[J]. 中国物理B, 2013, 22(10): 107806-107806.

Zheng Long (郑龙), Wu Xiao-Shan (吴小山). Structural distortions and magnetisms in Fe-doped LaMn_1-xFe_xO₃ (0< x ≤ 0.6)[J]. Chin. Phys. B, 2013, 22(10): 107806-107806.

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Structural distortions and magnetisms in Fe-doped LaMn_1-xFe_xO₃ (0< x ≤ 0.6)

Structural distortions and magnetisms in Fe-doped LaMn_1-xFe_xO₃ (0< x ≤ 0.6)

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