Absence of ferromagnetism in MnBi2Te4/Bi2Te3 down to 6 K
Absence of ferromagnetism in MnBi2Te4/Bi2Te3 down to 6 K
复制标题
DOI：
10.1103/physrevb.103.205405
复制
发表时间：
2021-05-04
影响因子：
3.7
通讯作者：
Hirahara, T.
中科院分区：
文献类型：
--
作者：
Fukasawa, T.;Kusaka, S.;Hirahara, T.
通过低能电子衍射I-V和扫描透射电子显微镜测量，我们成功地将Mn和Te掺入Bi2Te3最顶层的五层内，制备了MnBi2Te4/Bi2Te3异质结构。异质结构的表面态狄拉克锥与原始Bi2Te3相比变化不大，x射线磁圆二色性测量表明该体系的顺磁性低至5.6 K。这些结果与之前在相关材料上的研究结果形成了对比，这些研究显示了10 K左右的磁阶以及理论预测，并表明了二维范德华磁体磁性质的复杂性。
We successfully fabricated a MnBi2Te4/Bi2Te3 heterostructure by incorporating Mn and Te inside the topmost quintuple layer of Bi2Te3, as unambiguously confirmed by low-energy electron diffraction I-V and scanning transmission electron microscopy measurements. The surface-state Dirac cone of the heterostructure showed little change compared to that of pristine Bi2Te3, and x-ray magnetic circular dichroism measurements showed that the system was paramagnetic down to 5.6 K. These results are in contrast to previous works on related materials that showed magnetic order around 10 K as well as theoretical predictions and suggest the intricacy of the magnetic properties of two-dimensional van der Waals magnets.