Crystal structure and magnetic properties of Nd(Mn1-xFex)2Si2 compounds
Chen Ye-Qing(陈业青)a), Luo Jun(骆军)a)†, Liang Jing-Kui(梁敬魁)a)b), Li Jing-Bo(李静波)a), and Rao Guang-Hui(饶光辉)a)
a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; b International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China
Abstract X-ray powder diffraction, resistivity and magnetization studies have been performed on polycrystalline Nd(FexMn1 - x)2Si2 (0 ≤ x ≤ 1) compounds which crystallize in a ThCr2Si2-type structure with the space group I4/mmm. The field-cooled temperature dependence of the magnetization curves shows that, at low temperatures, NdFe2Si2 is antiferromagnetic, while the other compounds show ferromagnetic behaviour. The substitution of Fe for Mn leads to a decrease in lattice parameters a, c and unit-cell volume V. The Curie temperature of the compounds first increases, reaches a maximum around x=0.7, then decreases with Fe content. However, the saturation magnetization decreases monotonically with increasing Fe content. This Fe concentration dependent magnetization of Nd(FexMn1-x)2Si2 compounds can be well explained by taking into account the complex effect on magnetic properties due to the substitution of Mn by Fe. The temperature's square dependence on electrical resistivity indicates that the curve of Nd(Fe0.6Mn0.4)2Si2 has a quasi-linear character above its Curie temperature, which is typical of simple metals.
Received: 25 May 2009
Revised: 22 June 2009
Accepted manuscript online:
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
Fund: Project supported by the National
Basic Research Program of China (Grant No 2006CB601101).
Cite this article:
Chen Ye-Qing(陈业青), Luo Jun(骆军), Liang Jing-Kui(梁敬魁), Li Jing-Bo(李静波), and Rao Guang-Hui(饶光辉) Crystal structure and magnetic properties of Nd(Mn1-xFex)2Si2 compounds 2009 Chin. Phys. B 18 4944
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