Damped Dirac magnon in a metallic Kagome antiferromagnet FeSn

ORAL

Abstract

FeSn is a prototype Kagome magnetic metal exhibiting novel electronic properties. We report inelastic neutron scattering studies of the spin excitation spectrum of FeSn. The spectra display well-defined spin waves extending up to 120 meV. Above this energy, the spin waves become progressively broadened, reflecting interactions with the Stoner continuum. Using linear spin wave theory, we have determined an effective spin Hamiltonian that reproduces the measured dispersion at energies below the Stoner continuum. This analysis indicates that the Dirac magnon at the K-point remarkably occurs on the brink of a region where well-defined spin waves become damped. Our results emphasize the influential role of itinerant carriers on the topological spin excitations of metallic Kagome magnets

*This research was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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Publication: S.-H. Do et al., arXiv:2107.08915v1 (2021)

Presenters

  • Seunghwan Do

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab

Authors

  • Seunghwan Do

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Koji Kaneko

    • Materials Sciences Research Center, JAEA, Japan
    • JAEA Tokai

  • Ryoichi Kajimoto

    • Materials and Life Science Division, J-PARC Center, Japan

  • Kazuya Kamazawa

    • Neutron Science and Technology Center, CROSS, Japan
    • Comprehensive Research Organization for Science and Society

  • Matthew B Stone

    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Lab, Oak Ridge, Tennessee 37831, USA

  • Shinichi Itoh

    • Materials and Life Science Division, J-PARC Center, Japan
    • High Energy Accelerator Research Organization

  • Takatsugu Masuda

    • Institute for Solid State Physics, University of Tokyo, Japan
    • The University of Tokyo

  • German D Samolyuk

    • Oak Ridge National Lab

  • Elbio R Dagotto

    • University of Tennessee

  • William Meier

    • oak ridge national laboratory
    • Materials Science and Technology Division, ORNL, USA

  • Brian C Sales

    • Oak Ridge National Lab

  • Hu Miao

    • Oak Ridge National Labs

  • Andrew Christianson

    • Materials Science and Technology Division, ORNL, USA
    • Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • oak ridge national lab