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 and Leslie M. Schoop
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Maia G. Vergniory: Donostia International Physics Center
Luis Elcoro: Condensed Matter Physics Department, Faculty of Science and Technology, University of the Basque Country UPV/EHU
Fabio Orlandi: ISIS Neutron Pulsed Facility, Science and Technology Facilities Council, Rutherford Appleton Laboratory
Benjamin Balke: Universität Stuttgart, Institut für Materialwissenschaft - Chemische Materialsynthese
Yang-Hao Chan: Institute of Atomic and Molecular Sciences, Academia Sinica
Juergen Nuss: Max-Planck-Institut für Festkörperforschung
Andreas P. Schnyder: Max-Planck-Institut für Festkörperforschung
Leslie M. Schoop: Princeton University

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 10, 1-7

Abstract: 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.

Date: 2018
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DOI: 10.1140/epjb/e2018-90302-7

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