The interplay between the lattice and magnetism in La(Fe 11.4 Al 1.6 )C 0.02 studied by powder neutron diffraction
The interplay between the lattice and magnetism in La(Fe 11.4 Al 1.6 )C 0.02 studied by powder neutron diffraction
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DOI：
10.1088/1674-1056/21/4/046101
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发表时间：
2012-04
影响因子：
1.7
通讯作者：
Zhi-Cui Wang;Lunhua He;Hai Wang;Liu Rongdeng;Fangwei Wang
中科院分区：
文献类型：
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作者：
Zhi-Cui Wang;Lunhua He;Hai Wang;Liu Rongdeng;Fangwei Wang
用磁性测量和粉末中子衍射研究了La（Fe 11.4Al 1.6）C 0.02的晶体结构和磁性随温度和外加磁场的变化。Rietveld精修表明La（Fe 11.4Al 1.6）C0.02结晶为立方NaZn 13型，具有两个不同的Fe位：Fe I（8b）和Fe II（96 i），Al原子优先占据Fe II位。在39 K ~ 139 K的中温下，外加磁场为0.7 T时，可诱导出铁磁态，在100 K和0.7 T时，相应地出现大晶格。在所有其他条件下，La（Fe11.4Al1.6）C0.02在顺磁（T > TN = 182 K）或反铁磁状态下没有净磁化，因此保持其小晶格。Fe-Fe键长的分析表明，铁磁状态更喜欢更长的Fe-Fe距离。
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.