The magnetic structure in the antiferromagnetic phase of Ce(Fe1-xCox)2
The magnetic structure in the antiferromagnetic phase of Ce(Fe1-xCox)2
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Ce(Fe1-xCox)2反铁磁相的磁结构
DOI：
10.1088/0953-8984/1/3/014
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
B. Coles
中科院分区：
文献类型：
--
作者：
S. Kennedy;A. Murani;J. Cockcroft;S. Roy;B. Coles
本文用粉末中子衍射方法测定了立方晶系Laves相Ce（Fe_（1-x）Cox）_2（x=0.15，0.20）的低温（T约为90 K）磁相变性质。低于这个温度，铁磁性被反铁磁性相取代，它由（111）型片组成，具有平行自旋和相邻（111）片之间的反平行自旋耦合。磁矩的方向不能被唯一确定;然而，它们在相对于（111）片由sin 2 phi =2/3定义的圆锥内取向，并且包括（Fe，Co）子晶格最近邻方向。没有差异的幅度之间的（Fe，Co）的亚晶格的两个阶段的时刻可以检测到，也没有任何显着的磁矩检测在Ce网站在任何阶段。高分辨率的中子衍射测量表明，在反铁磁相的应用程序的大磁场（约= 4 T）恢复铁磁性，并删除相关的结构畸变。
The nature of the low-temperature (T approximately=90 K) magnetic phase transition in cubic Laves-phase Ce(Fe1-xCox)2 compounds with x=0.15, 0.20 has been determined using powder neutron diffraction measurements. Below this temperature, ferromagnetism is replaced by an antiferromagnetic phase, which consists of (111)-type sheets with parallel spins and antiparallel coupling of spins between adjacent (111) sheets. The orientation of the magnetic moments could not be uniquely determined; however, they are oriented within a cone that is defined by sin2 phi =2/3 relative to the (111) sheets and includes the (Fe, Co) sublattice nearest-neighbour directions. No difference in magnitude between the (Fe, Co) sublattice moments of the two phases could be detected, nor was any significant magnetic moment detected at the Ce sites in either phase. High-resolution neutron diffraction measurements show that the application of large magnetic fields ( approximately=4T) in the antiferromagnetic phase restores ferromagnetism and removes the associated structural distortion.