Crystal structure and magnetic properties of Nd(Mn1-xFex)2Si2 compounds

doi:10.1088/1674-1056/18/11/054

中国物理B ›› 2009, Vol. 18 ›› Issue (11): 4944-4948.doi: 10.1088/1674-1056/18/11/054

Crystal structure and magnetic properties of Nd(Mn_1-xFe_x)₂Si₂ compounds

陈业青¹, 骆军¹, 李静波¹, 饶光辉¹, 梁敬魁²

(1)Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; (2)Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China

收稿日期:2009-05-25 修回日期:2009-06-22 出版日期:2009-11-20 发布日期:2009-11-20
基金资助:
Project supported by the National Basic Research Program of China (Grant No 2006CB601101).

Crystal structure and magnetic properties of Nd(Mn_1-xFe_x)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

Received:2009-05-25 Revised:2009-06-22 Online:2009-11-20 Published:2009-11-20
Supported by:
Project supported by the National Basic Research Program of China (Grant No 2006CB601101).

摘要/Abstract

摘要： X-ray powder diffraction, resistivity and magnetization studies have been performed on polycrystalline Nd(Fe_xMn_1 - 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(Fe_xMn_1-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(Fe_0.6Mn_0.4)₂Si₂ has a quasi-linear character above its Curie temperature, which is typical of simple metals.

Abstract: X-ray powder diffraction, resistivity and magnetization studies have been performed on polycrystalline Nd(Fe_xMn_{1 - 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(Fe_xMn_1-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(Fe_0.6Mn_0.4)₂Si₂ has a quasi-linear character above its Curie temperature, which is typical of simple metals.

Key words: Nd(Fe_xMn_1-x)₂Si₂, crystal structure , magnetic properties , resistivity

中图分类号: (Alloys )

61.66.Dk

75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 72.15.Eb (Electrical and thermal conduction in crystalline metals and alloys) 75.50.Ee (Antiferromagnetics) 75.50.Bb (Fe and its alloys) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

陈业青, 骆军, 梁敬魁, 李静波, 饶光辉. Crystal structure and magnetic properties of Nd(Mn_1-xFe_x)₂Si₂ compounds[J]. 中国物理B, 2009, 18(11): 4944-4948.

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(Mn_1-xFe_x)₂Si₂ compounds[J]. Chin. Phys. B, 2009, 18(11): 4944-4948.

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Crystal structure and magnetic properties of Nd(Mn_1-xFe_x)₂Si₂ compounds

Crystal structure and magnetic properties of Nd(Mn_1-xFe_x)₂Si₂ compounds

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