Please use this identifier to cite or link to this item: https://doi.org/10.1038/srep38839
Title: Room-temperature magnetic topological Weyl fermion and nodal line semimetal states in half-metallic Heusler Co2 TiX (X=Si, Ge, or Sn)
Authors: Chang, G
Xu, S.-Y
Zheng, H
Singh, B 
Hsu, C.-H 
Bian, G
Alidoust, N
Belopolski, I
Sanchez, D.S
Zhang, S
Lin, H 
Hasan, M.Z
Issue Date: 2016
Publisher: Nature Publishing Group
Citation: Chang, G, Xu, S.-Y, Zheng, H, Singh, B, Hsu, C.-H, Bian, G, Alidoust, N, Belopolski, I, Sanchez, D.S, Zhang, S, Lin, H, Hasan, M.Z (2016). Room-temperature magnetic topological Weyl fermion and nodal line semimetal states in half-metallic Heusler Co2 TiX (X=Si, Ge, or Sn). Scientific Reports 6 : 38839. ScholarBank@NUS Repository. https://doi.org/10.1038/srep38839
Abstract: 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 Co2 TiX (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, Co2 TiX 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 Co2 TiX compounds at high temperature. © The Author(s) 2016.
Source Title: Scientific Reports
URI: https://scholarbank.nus.edu.sg/handle/10635/174905
ISSN: 20452322
DOI: 10.1038/srep38839
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