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

Chang, Guoqing; Xu, Su -Yang; Zheng, Hao; Singh, Bahadur; Hsu, Chuang -Han; Bian, Guang; Alidoust, Nasser; Belopolski, Ilya; Sanchez, Daniel S.; Zhang, Songtian; Lin, Hsin; Hasan, M. Zahid

doi:10.1038/srep38839

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

Journal Article · Thu Dec 15 00:00:00 EST 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep38839· OSTI ID:1361395

Chang, Guoqing ^[1]; Xu, Su -Yang ^[2]; Zheng, Hao ^[2]; Singh, Bahadur ^[1]; Hsu, Chuang -Han ^[1]; Bian, Guang ^[2]; Alidoust, Nasser ^[2]; Belopolski, Ilya ^[2]; Sanchez, Daniel S. ^[2]; Zhang, Songtian ^[2]; Lin, Hsin ^[1]; Hasan, M. Zahid ^[2]

National Univ. of Singapore (Singapore)
Princeton Univ., Princeton, NJ (United States)

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. Lastly, 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.

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Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER46200

OSTI ID:: 1361395

Journal Information:: Scientific Reports, Vol. 6, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 134 works

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