Magnetic phase transition in Mn0.5Te0.5−xSbx
Magnetic phase transition in Mn0.5Te0.5−xSbx
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Mn0.5Te0.5−xSbx 中的磁相变
DOI：
10.1063/1.338720
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发表时间：
1987
影响因子：
3.2
通讯作者：
S. Noor
中科院分区：
文献类型：
--
作者：
S. Noor
利用电阻率和X射线粉末衍射技术研究了NiAs型Mn0.5Te0.5−xSbx系统的磁相变。晶体学上，发现晶格参数（a）随x平滑地减小，而（c）以阶梯状的方式表现，在0.2（1.63）处发生转变，这代表了砷化镍的金属性质（在x>0.3处）。另一方面，电阻率曲线的形状表现出逐渐演变与增加x值，确认所提出的相变。电阻率最小值对x的曲线图显示出在0.2<x<0.3的范围内的明显反转。此外，由ln σ vs 1/T曲线确定的具有绝缘性质的样品的激活能随x急剧下降。这一切都被认为是由于电子浓度的变化。
The magnetic phase transition in the (NiAs‐type) system Mn0.5Te0.5−xSbx was investigated by electrical resistivity and x‐ray powder diffraction techniques. Crystallographically, the lattice parameter (a) was found to decrease smoothly with x, while (c) behaved in a steplike manner with the changeover taking place at 0.2 1.63) which typifies the metallic nature (at x>0.3) in nickel arsenides. On the other hand, the shapes of the electrical resistivity curves exhibited a gradual evolution with increasing x values, confirming the proposed phase transition. A plot of resistivity minima versus x showed a clear inversion in the range 0.2<x<0.3. Moreover, activation energies of specimens characterized by the insulating nature, determined from the ln σ vs 1/T plots, dropped sharply with x. It is all thought to be due to changes in the electronic concent...