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

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

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.

Keywords: structural distortion X-ray absorption phase transition

Received: 21 March 2013
Revised: 19 April 2013
Accepted manuscript online:

PACS:	78.70.Dm	(X-ray absorption spectra)
	36.40.Cg	(Electronic and magnetic properties of clusters)
	61.05.cp	(X-ray diffraction)

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

Cite this article:

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) 2013 Chin. Phys. B 22 107806

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

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