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Chin. Phys. B, 2012, Vol. 21(4): 046101    DOI: 10.1088/1674-1056/21/4/046101
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

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

Wang Zhi-Cuia b,He Lun-Huab,Wang Haia,Liu Rong-Dengc,Wang Fang-Weib
1. Magneto-Optic Thin Film Laboratory, Department of Physics, Capital Normal University, Beijing 100037, China;
2. ECTSI/CSNS, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3. China Institute of Atomic Energy, Beijing 102413, China
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.
Keywords:  neutron diffraction      crystallographic structure      magnetic phase transition  
Received:  04 January 2012      Revised:  10 January 2012      Published:  29 February 2012
PACS:  61.05.F- (Neutron diffraction and scattering)  
  83.10.Tv (Structural and phase changes)  
Fund: 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).
Corresponding Authors:  Wang Fang-Wei,fwwang@aphy.iphy.ac.cn     E-mail:  fwwang@aphy.iphy.ac.cn

Cite this article: 

Wang Zhi-Cui,He Lun-Hua,Wang Hai,Liu Rong-Deng,Wang Fang-Wei The interplay between the lattice and magnetism in La(Fe11.4Al1.6)C0.02 studied by powder neutron diffraction 2012 Chin. Phys. B 21 046101

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