On the possibility of magnetic Weyl fermions in non-symmorphic compound PtFeSb

Maia G. Vergniory, Luis Elcoro, Fabio Orlandi, Benjamin Balke, Yang Hao Chan, Juergen Nuss, Andreas P. Schnyder, Leslie M. Schoop

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Abstract

Weyl fermions are expected to exhibit exotic physical properties such as the chiral anomaly, large negative magnetoresistance or Fermi arcs. Recently a new platform to realize these fermions has been introduced based on the appearance of a three-fold band crossing at high symmetry points of certain space groups. These band crossings are composed of two linearly dispersed bands that are topologically protected by a Chern number, and a flat band with no topological charge. In this paper, we present a new way of inducing two kinds of Weyl fermions, based on two- and three-fold band crossings, in the non-symmorphic magnetic material PtFeSb. By means of density functional theory calculations and group theory analysis, we show that magnetic order can split a six-fold degeneracy enforced by non-symmoprhic symmetry to create three- or two-fold degenerate Weyl nodes. We also report on the synthesis of a related phase potentially containing two-fold degenerate magnetic Weyl points and extend our group theory analysis to that phase. This is the first study showing that magnetic ordering has the potential to generate new three-fold degenerate Weyl nodes, advancing the understanding of magnetic interactions in topological materials.

Original languageEnglish (US)
Article number213
JournalEuropean Physical Journal B
Volume91
Issue number10
DOIs
StatePublished - Oct 1 2018

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Vergniory, M. G., Elcoro, L., Orlandi, F., Balke, B., Chan, Y. H., Nuss, J., Schnyder, A. P., & Schoop, L. M. (2018). On the possibility of magnetic Weyl fermions in non-symmorphic compound PtFeSb. European Physical Journal B, 91(10), [213]. https://doi.org/10.1140/epjb/e2018-90302-7