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Damped Dirac magnon in the metallic kagome antiferromagnet FeSn

Seung-Hwan Do1, Koji Kaneko2,3, Ryoichi Kajimoto2, Kazuya Kamazawa4, Matthew B. Stone5, Jiao Y. Y. Lin6, Shinichi Itoh2,7, Takatsugu Masuda8,7, German D. Samolyuk1 et al.

Elbio Dagotto1,9, William R. Meier1, Brian C. Sales1, Hu Miao1, and Andrew D. Christianson1

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 2Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan
  • 3Materials Sciences Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 4Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society, Tokai, Ibaraki 319-1106, Japan
  • 5Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 6Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 7Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0081, Japan
  • 8Institute for Solid State Physics, The University of Tokyo, Chiba 277-8581, Japan
  • 9Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA

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Phys. Rev. B 105, L180403 – Published 6 May, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L180403

Abstract

The kagome lattice is a fertile platform to explore topological excitations with both Fermi-Dirac and Bose-Einstein statistics. While relativistic Dirac fermions and flat bands have been discovered in the electronic structure of kagome metals, the spin excitations have received less attention. Here, we report inelastic neutron scattering studies of the prototypical kagome magnetic metal FeSn. The spectra display well-defined spin waves extending to 120 meV. Above this energy, the spin waves become progressively broadened, reflecting interactions with the Stoner continuum. Using linear spin-wave theory, we determine an effective spin Hamiltonian that reproduces the measured dispersion. 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 unobservable. Our results emphasize the influential role of itinerant carriers on the topological spin excitations of metallic kagome magnets.

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Corrections

1 August, 2022

Correction: The previously published Ref. [27] contained an error and has been fixed.

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Phys. Rev. B 105, L180403– Published 6 May, 2022
  • Received 18 July 2021
  • Revised 18 January 2022
  • Accepted 6 April 2022
  • Corrected 1 August 2022
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