The interplay between the lattice and magnetism in La(Fe<sub>11.4</sub>Al<sub>1.6</sub>)C<sub>0.02</sub> studied by powder neutron diffraction |
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| Authors: | Wang Zhi-Cui ab He Lun-Hua b Wang Haia Liu Rong-Deng c and Wang Fang-Wei |
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| Institution: | Magneto-Optic Thin Film Laboratory, Department of Physics, Capital Normal University, Beijing 100037, China;ECTSI/CSNS, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;China Institute of Atomic Energy, Beijing 102413, China |
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| Abstract: | The crystallographic structure and magnetic properties of La(Fe 11.4 Al 1.6 )C 0.02 are studied by magnetic measure- ment and powder neutron diffraction with temperature and applied magnetic field. Rietveld refinement shows that La(Fe 11.4 Al 1.6 )C 0.02 crystallizes into the cubic NaZn 13 -type with two different Fe sites: Fe I (8b) and Fe II (96i), and that Al atoms preferentially occupy the Fe II 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(Fe 11.4 Al 1.6 )C 0.02 has no net magnetization in the paramagnetic (T > T N = 182 K) or antifer- romagnetic states, and thus keeps its small lattice. Analysis of the Fe–Fe bond length indicates that the ferromagnetic state prefers longer Fe–Fe distances. |
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| Keywords: | neutron diffraction crystallographic structure magnetic phase transition |
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