论文标题
TMCO $ _2 $中的晶格失真：多晶和单晶研究
Lattice distortion in TmCo$_2$: a poly- and single- crystal study
论文作者
论文摘要
在RCO $ _2 $化合物家族中，可以观察到与临界温度周围磁排序发作相关的结构变形。较少探索的RCO $ _2 $化合物之一是TMCO $ _2 $，可能是由于其低温温度。鉴于其在铁磁性系列的末端的位置，这种化合物的位置异常，由于魏斯分子场较弱，因此在co子层的订购中显示了差异。在本文中，我们着重于TMCO $ _2 $中的结构失真，它与$ t_ {c} \ sim3.6 $ 〜k的临界温度围绕的磁序一起出现。在我们的实验中，使用了TMCO $ _2 $的多晶和单晶。对于这两种样品，我们从立方FD $ \ bar {3} $ m到r $ \ bar {3} $ m空间群，沿[111]方向观察到了相同类型的菱形畸变。讨论了该化合物中观察到的磁性和结构特性之间的关系。
Within the RCo$_2$ family of compounds, a structural distortion linked with the onset of magnetic ordering around the critical temperature can be observed. One of the less explored RCo$_2$ compounds is TmCo$_2$ probably due to its low Curie temperature. Exceptionally this compound, given its position at the end of the ferrimagnetic series, shows discrepancies in the ordering of the Co sub-lattice because of a weak Weiss molecular field. In this paper we focus on the structural distortion in TmCo$_2$, which appears together with the magnetic ordering around the critical temperature of $T_{C}\sim3.6$~K. Poly-crystals as well as single-crystals of TmCo$_2$ were used in our experiments. For both kinds of samples we observed the same type of the rhombohedral distortion along the [111] direction from the cubic Fd$\bar{3}$m to R$\bar{3}$m space group. The relation between observed magnetic and structural properties in this compound is discussed.
