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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Structure, magnetic and electrical properties of the UMn4-xFexAl8 system
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Structure, magnetic and electrical properties of the UMn4-xFexAl8 system

机译：UMn4-xFexAl8系统的结构，电磁性能

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UMn4Al8 is paramagnetic, however, it seems to be on the verge of magnetic ordering. Therefore, it is interesting to check if an admixture of Fe can induce a magnetic ordering in the U and Mn sublattices. The UMn4-xFexAl8 system exists in the whale concentration range 0 less than or equal to x less than or equal to 4. The lattice parameters follow roughly Vegard's law. Magnetic susceptibility, which is measured at T=1.8-300 K in a magnetic field of 0.5 T, fulfils the Curie-Weiss law above 100 K for x=1 and 2, and above 150 K for x=3; however, the values of the effective magnetic moment and the paramagnetic Curie temperature have only the meaning of the material constants. Below 100 K, the temperature dependence of magnetic susceptibility exhibits anomalies which can be related to magnetic ordering of different sublattices (Fe,U,Mn?). Magnetization measurements at 4.2 K in magnetic fields up to 40 T (pulsed held) show a hysteresis and saturation that indicate a ferro(ferri)magnetic character of the ordering. The electric resistivity curves versus temperature show a shape which is far from a typical metallic behavior. Magnetoresistivity curves are similar to those observed for UFe4Al8. (C) 1998 Elsevier Science S.A. [References: 13]
机译：UMn4Al8是顺磁性的，但是，它似乎处于磁性排序的边缘。因此，有趣的是检查铁的混合物是否可以在U和Mn亚晶格中引起磁序。 UMn4-xFexAl8系统存在于鲸鱼浓度范围0小于或等于x小于或等于4。晶格参数大致遵循Vegard定律。在0.5 T的磁场中，在T = 1.8-300 K时测得的磁化率满足x = 1和2高于100 K，x = 3高于150 K的居里-魏斯定律;然而，有效磁矩和顺磁性居里温度的值仅具有材料常数的含义。低于100 K时，磁化率的温度依赖性显示出异常，这可能与不同亚晶格（Fe，U，Mn？）的磁排序有关。在高达40 T（脉冲保持）的磁场中，在4.2 K时的磁化强度测量显示出磁滞和饱和，表明有序的铁（铁）磁特性。电阻率曲线与温度的关系曲线显示出与典型的金属行为相去甚远的形状。磁电阻率曲线与对UFe4Al8观察到的相似。 （C）1998 Elsevier Science S.A. [参考：13]

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