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Room-temperature magnetic topological Weyl fermion and nodal line semimetal states in half-metallic Heusler Co2TiX (X=Si Ge or Sn)

机译:半金属Heusler Co2TiX(X = SiGe或Sn)中的室温磁性拓扑Weyl铁氧体和节点线半金属态

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摘要

Topological semimetals (TSMs) including Weyl semimetals and nodal-line semimetals are expected to open the next frontier of condensed matter and materials science. Although the first inversion breaking Weyl semimetal was recently discovered in TaAs, its magnetic counterparts, i.e., the time-reversal breaking Weyl and nodal line semimetals, remain elusive. They are predicted to exhibit exotic properties distinct from the inversion breaking TSMs including TaAs. In this paper, we identify the magnetic topological semimetal states in the ferromagnetic half-metal compounds Co2TiX (X = Si, Ge, or Sn) with Curie temperatures higher than 350 K. Our first-principles band structure calculations show that, in the absence of spin-orbit coupling, Co2TiX features three topological nodal lines. The inclusion of spin-orbit coupling gives rise to Weyl nodes, whose momentum space locations can be controlled as a function of the magnetization direction. Our results not only open the door for the experimental realization of topological semimetal states in magnetic materials at room temperature, but also suggest potential applications such as unusual anomalous Hall effect in engineered monolayers of the Co2TiX compounds at high temperature.
机译:包括Weyl半金属和节点线半金属在内的拓扑半金属(TSM)有望打开冷凝物质和材料科学的下一个前沿领域。尽管最近在TaAs中发现了第一个反转断裂的Weyl半金属,但其磁性对应物,即时间反转断裂的Weyl和结线半金属仍然难以捉摸。预计它们将表现出异乎寻常的特性,与包括TaAs的反转破坏TSM截然不同。在本文中,我们确定了居里温度高于350 K的铁磁半金属化合物Co2TiX(X = Si,Ge或Sn)中的磁性拓扑半金属态。自旋轨道耦合,Co2TiX具有三个拓扑结线。自旋轨道耦合的引入产生了Weyl节点,其动量空间位置可以根据磁化方向进行控制。我们的结果不仅为室温下磁性材料中拓扑半金属态的实验实现打开了大门,而且还提出了潜在的应用,例如高温下Co2TiX化合物的工程单层中异常的异常霍尔效应。

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