Reinvestigation of long-range magnetic ordering in icosahedral Tb-Mg-Zn
Reinvestigation of long-range magnetic ordering in icosahedral Tb-Mg-Zn
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DOI：
10.1103/physrevb.57.r11047
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发表时间：
1998-05-01
影响因子：
3.7
通讯作者：
Goldman, AI
中科院分区：
文献类型：
--
作者：
Islam, Z;Fisher, IR;Goldman, AI
我们目前的研究结果可能在二十面体相的Tb-Mg-Zn探测体磁化强度测量和中子衍射的磁有序。对破碎的单个晶粒和铸造的多晶样品的To-Mg-Zn进行测量。两个样品的磁化强度测量结果显示，只有一个自旋玻璃样转变在约5.8 g。来自破碎的单个晶粒的中子衍射仅揭示了低温下的短程磁有序，没有先前报道的长程磁有序的证据[Charrier，Ouladdiff，and施密特Phys.Rev.Lett. 78，4637（1997）]。同样，铸造多晶样品在低温下主要表现出扩散磁散射，但观察到至少一个相对尖锐的衍射峰。我们的研究结果表明，对于单晶粒样品，没有长程磁有序，在最好的情况下，这些准晶合金中的磁有序不是很强大。
We present results of a study of possible magnetic ordering in the icosahedral phase of Tb-Mg-Zn probed by bulk magnetization measurements and neutron diffraction. Measurements on both crushed single grains and cast polycrystalline samples of To-Mg-Zn were performed. Magnetization measurements on both samples reveal only a spin-glass-like transition at approximately 5.8 g. Neutron diffraction from the crushed single grains reveals only short-range magnetic ordering at low temperatures, with no evidence of the long-range magnetic ordering reported previously [Charrier, Ouladdiaf, and Schmitt Phys. Rev. Lett. 78, 4637 (1997)]. Likewise, the cast polycrystalline samples exhibit primarily diffuse magnetic scattering at low temperature, but at least one relatively sharp diffraction peak was observed. Our results indicate that for single grain samples there is no long-range magnetic ordering and that, at best, the magnetic ordering in these quasicrystalline alloys is not very robust.