R_3(Fe,M)_(29)化合物中的Fe-Fe及R-Fe之间的交换作用

The Fe-Fe and R-Fe Exchange interactions in R_3(Fe,M)_29 Compounds

根据Ｒ３（Ｆｅ，Ｍ）２９（Ｒ＝稀土，Ｍ＝Ｖ、Ｔｉ、Ｍｏ）化合物的居里温度的实验值，使用平均场近似的方法计算Ｒ３（Ｆｅ，Ｍ）２９化合物中的Ｒ－Ｆｅ，Ｆｅ－Ｆｅ之间的交换耦合参数ＪＲＦｅ和ＪＦｅＦｅ。结果表明：对于Ｒ相同而Ｍ不同时，当Ｍ＝Ｖ时ＪＦｅＦｅ最大，而Ｍ＝Ｍｏ时ＪＦｅＦｅ最小；但是，当Ｍ＝Ｔｉ时ＪＲＦｅ最大，当Ｍ＝Ｍｏ时ＪＲＦｅ最小。

The effective exchange coupling parameters JFeFe in the Fe sublattice and JRFe between the R and Fe sublattices have been caculated based on a mean field approximation according to the experimental values of the Curie temperature of R_3(Fe,M)_29(R=rare earth,M=V,Ti and Mo)compoundsJFeFe is largest when M=V and smallest when M=Mo,but JRFe is largest when M=Ti and smallest when M=Mo for the same R and different M in the R_3(Fe,M)_29 compounds