Spin-wave excitations in the antiferromagnetic Weyl semimetal candidates Mn3Ge and Mn3Sn

ORAL

Abstract

Mn3X ( with X = Ge or Sn) are semimetal antiferromagnets with large anomalous Hall and Nernst effects. These anomalous transport properties have been attributed to the presence of electronic Weyl nodes near the Fermi energy of these materials [1,2]. The magnetism of Mn3X remains relatively unexplored. For example, a detail knowledge of their magnetic excitations is still lacking. In this talk, we report the inelastic neutron scattering spectra of Mn3Ge and Mn3Sn. Our analysis reveals linear dispersive modes that are gapped by ~ 5 meV and have an energy bandwidth of ~ 80 meV. Spin Hamiltonians for both Mn3Sn and Mn3Ge have been derived and will be presented along with a detailed comparison between the two sister compounds. [1] S. Nakasutji et al., Nature 527, p.212–215 (2015) [2] M. Iklhas et al., Nature Physics 13, p. 1085–1090 (2017)

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Presenters

  • Jonathan Gaudet

    Department of Physics and Astronomy, McMaster University, Johns Hopkins University, Baltimore, MD 21218, Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Physics and Astronomy, Johns Hopkins University, IQM, Johns Hopkins University

Authors

  • Jonathan Gaudet

    Department of Physics and Astronomy, McMaster University, Johns Hopkins University, Baltimore, MD 21218, Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Physics and Astronomy, Johns Hopkins University, IQM, Johns Hopkins University

  • Youzhe Chen

    IQM, Johns Hopkins University, Johns Hopkins University

  • Guy G Marcus

    IQM, Johns Hopkins University, Johns Hopkins University

  • Ikhlas Muhammad

    University of Tokyo, ISSP, U Tokyo

  • Naoki kiyohara

    ISSP, U Tokyo, U Tokyo, ISSP

  • Agustinus A. Nugroho

    ISSP, U Tokyo, U Tokyo, ISSP

  • Satoru Nakatsuji

    University of Tokyo, Institute for Solid State Physics, Advanced Materials Science, The University of Tokyo, University of Tokyo, ISSP, U Tokyo, U Tokyo, ISSP, ISSP, University of Tokyo

  • Matthew Brandon Stone

    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Laboratory, Oak Ridge National Lab, Spallation Neutron Source, Oak Ridge National Laboratory

  • Minoru Soda

    ISSP, U Tokyo

  • Takatsugu Masuda

    ISSP, U Tokyo

  • Collin Broholm

    Johns Hopkins, Johns Hopkins University, IQM, Johns Hopkins University, Department of Physics and Astronomy, Johns Hopkins University