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

The European Physical Journal B volume 91, Article number: 213 (2018) Cite this article

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.

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Authors and Affiliations

  1. Donostia International Physics Center, P. Manuel de Lardizabal 4, 20018, Donostia-San Sebastián, Spain

    Maia G. Vergniory

  2. IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013, Bilbao, Spain

    Maia G. Vergniory

  3. Department of Applied Physics II, Faculty of Science and Technology, University of the Basque Country UPV/EHU, Apdo. 644, 48080, Bilbao, Spain

    Maia G. Vergniory

  4. Condensed Matter Physics Department, Faculty of Science and Technology, University of the Basque Country UPV/EHU, Apdo. 644, 48080, Bilbao, Spain

    Luis Elcoro

  5. ISIS Neutron Pulsed Facility, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Oxford, OX11 0QX, UK

    Fabio Orlandi

  6. Universität Stuttgart, Institut für Materialwissenschaft - Chemische Materialsynthese, Heisenbergstr. 3, 70569, Stuttgart, Germany

    Benjamin Balke

  7. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan

    Yang-Hao Chan

  8. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 , Stuttgart, Germany

    Juergen Nuss & Andreas P. Schnyder

  9. Department of Chemistry, Princeton University, Princeton, NJ, 08540, USA

    Leslie M. Schoop

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  1. Maia G. Vergniory
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  2. Luis Elcoro
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Correspondence to Maia G. Vergniory.

Additional information

Contribution to the Topical Issue “Special issue in honor of Hardy Gross”, edited by C.A. Ullrich, F.M.S. Nogueira, A. Rubio, and M.A.L. Marques.

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Vergniory, M.G., Elcoro, L., Orlandi, F. et al. On the possibility of magnetic Weyl fermions in non-symmorphic compound PtFeSb. Eur. Phys. J. B 91, 213 (2018). https://doi.org/10.1140/epjb/e2018-90302-7

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  • DOI: https://doi.org/10.1140/epjb/e2018-90302-7