Magnetic properties of (Mn1-xRux)3Ga alloys
Magnetic properties of (Mn1-xRux)3Ga alloys
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DOI：
10.1007/s003390101148
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发表时间：
2002-12-01
影响因子：
2.7
通讯作者：
Yamaguchi, Y
中科院分区：
文献类型：
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作者：
Hori, T;Akimitsu, M;Yamaguchi, Y
我们发现，(Mn1-xRu-x)(3)Ga(0.33小于或等于x小于或等于0.67)伪二元合金具有有序的B.C.C.结构。晶格常数a对于x几乎是恒定的：当x=0.33时，a=6.000埃；当x=0.67时，a=5.992埃。对于x=0.33的合金，即Mn2RuGa，在20kOe的磁场中，磁化强度几乎饱和。4.2K下的饱和磁化强度为23emu/g，居里温度T-C为460K。(Mn1-xRux)(3)Ga的T-C随x的增加几乎呈线性下降，在x=0.67(MnRu2Ga)附近消失。我们还从中子衍射实验中测定了原子结构和磁性结构。合金Mn2RuGa(x=0.33)具有CuHg2Ti型有序结构，磁性锰原子主要占据4a(0，0，0)和4d(3/4，3/4，3/4)位。我们还观察到4a和4d位上的Mn原子的磁矩是反平行的，每个Mn原子的磁矩分别为Mu(A)=4.6和Mu(D)=3.3Mu(B)。
We found that the pseudo binary alloys (Mn1-x Ru-x)(3)Ga, with 0.33 less than or equal to x less than or equal to 0.67, have an ordered b.c.c. structure. The lattice constant a is almost constant with respect to x: a = 6.000 Angstrom for x = 0.33 and a = 5.992 Angstrom for x = 0.67. For the alloy with x = 0.33, i.e. Mn2RuGa, the magnetization is almost saturated in a field of 20 kOe. The saturation magnetization at 4.2 K is 23 emu/g, and the Curie temperature, T-C, is 460K. The T-C of (Mn1-xRux)(3)Ga decreases almost linearly with increasing x, and it vanishes around x = 0.67 (MnRu2Ga). We also determined atomic and magnetic structures from neutron diffraction experiments. The alloy Mn2RuGa (x = 0.33) has an ordered structure of CuHg2Ti type; the magnetic Mn atoms mainly occupy the 4a (0,0,0) and 4d (3/4, 3/4, 3/4) sites. We also observed that the magnetic moments of Mn atoms on the 4a and 4d sites are antiparallel to each other; values of the magnetic moment are mu(a) = 4.6 and mu(d) = 3.3 mu(B) per Mn atom.