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Engineering of Magnetically Intercalated Silicene Compound: An Overlooked Polymorph of EuSi2

机译:磁性嵌入硅化合物的工程:EuSi2的一个被忽略的多晶型物

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摘要

Silicene, a Si analogue of graphene, is suggested to become a versatile material for nanoelectronics. Being coupled with magnetism, it is predicted to be particularly suitable for spintronic applications. However, experimental realization of free-standing silicene and its magnetic derivatives is lacking. Fortunately, magnetism can be induced into silicene layers, in particular, by intercalation. Here, a successful synthesis of multilayer silicene intercalated by inherently magnetic Eu ions - a compound expected to exhibit both massless Dirac-cone states, as its Ca analogue, and a nontrivial magnetic structure - is reported. This new polymorph with EuSi2 stoichiometry is epitaxially stabilized by continual replication of silicene layers employing Sr-intercalated multilayer silicene as a template. The atomic structure of the new compound and its sharp interface with the template are confirmed using electron diffraction, X-ray diffraction, and electron microscopy techniques. Below 80 K, the material demonstrates anisotropic antiferromagnetism coexisting with weak ferromagnetism. The magnetic state is accompanied by an anomalous behavior of magnetoresistivity.
机译:硅(一种石墨烯的Si类似物)被建议成为纳米电子学的通用材料。结合磁力,预计特别适合自旋电子应用。然而,缺乏对独立式硅及其磁性衍生物的实验实现。幸运的是,特别是通过嵌入,可以将磁性感应到硅层中。在此,成功地合成了由固有的磁性Eu离子(一种有望表现出无质量的狄拉克锥状态(作为其Ca类似物)和非平凡的磁性结构的化合物)插入的多层硅化合物的合成方法。这种新的具有EuSi2化学计量比的多晶型物通过使用Sr插层的多层硅作为模板连续复制硅层来外延稳定。使用电子衍射,X射线衍射和电子显微镜技术证实了新化合物的原子结构及其与模板的清晰界面。在80 K以下,该材料显示出各向异性的反铁磁性与弱铁磁性共存。磁性状态伴随着磁阻的异常行为。

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