中国物理B ›› 2012, Vol. 21 ›› Issue (4): 46101-046101.doi: 10.1088/1674-1056/21/4/046101

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王志翠1 2,何伦华2,王海1,刘荣灯3,王芳卫2   

  • 收稿日期:2012-01-04 修回日期:2012-01-10 出版日期:2012-02-29 发布日期:2012-02-29
  • 通讯作者: 王芳卫,fwwang@aphy.iphy.ac.cn E-mail:fwwang@aphy.iphy.ac.cn

The interplay between the lattice and magnetism in La(Fe11.4Al1.6)C0.02 studied by powder neutron diffraction

Wang Zhi-Cui(王志翠)a) b), He Lun-Hua(何伦华)b), Wang Hai(王海)a), Liu Rong-Deng(刘荣灯)c), and Wang Fang-Wei(王芳卫)b)†   

  1. a. Magneto-Optic Thin Film Laboratory, Department of Physics, Capital Normal University, Beijing 100037, China;
    b. ECTSI/CSNS, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    c. China Institute of Atomic Energy, Beijing 102413, China
  • Received:2012-01-04 Revised:2012-01-10 Online:2012-02-29 Published:2012-02-29
  • Contact: Wang Fang-Wei,fwwang@aphy.iphy.ac.cn E-mail:fwwang@aphy.iphy.ac.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (973 Program) (Grant No. 2010CB833102) and the National Natural Science Foundation of China (Grant No. 10974244).

Abstract: The crystallographic structure and magnetic properties of La(Fe11.4Al1.6)C0.02 are studied by magnetic measurement and powder neutron diffraction with temperature and applied magnetic field. Rietveld refinement shows that La(Fe11.4Al1.6)C0.02 crystallizes into the cubic NaZn13-type with two different Fe sites: FeI (8b) and FeII (96i), and that Al atoms preferentially occupy the FeII site. A ferromagnetic state can be induced at a medial temperature of 39 K-139 K by an external magnetic field of 0.7 T, and a large lattice is correspondingly found at 100 K and 0.7 T. In all other conditions, La(Fe11.4Al1.6)C0.02 has no net magnetization in the paramagnetic (T>TN=182 K) or antiferromagnetic states, and thus keeps its small lattice. Analysis of the Fe-Fe bond length indicates that the ferromagnetic state prefers longer Fe-Fe distances.

Key words: neutron diffraction, crystallographic structure, magnetic phase transition

中图分类号:  (Neutron diffraction and scattering)

  • 61.05.F-
83.10.Tv (Structural and phase changes)