Damped Dirac magnon in the metallic kagome antiferromagnet FeSn

Do, Seung-Hwan; Kaneko, Koji; Kajimoto, Ryoichi; Kamazawa, Kazuya; Stone, Matthew B.; Lin, Jiao Y. Y.; Itoh, Shinichi; Masuda, Takatsugu; Samolyuk, German D.; Dagotto, Elbio; Meier, William R.; Sales, Brian C.; Miao, Hu; Christianson, Andrew D.

doi:10.1103/physrevb.105.l180403

Damped Dirac magnon in the metallic kagome antiferromagnet FeSn

Journal Article · Fri May 06 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.105.l180403· OSTI ID:1873833

^[1]; ^[2]; ^[3]; Kamazawa, Kazuya ^[4]; ^[1]; Lin, Jiao Y. Y. ^[1]; ^[5]; ^[6]; ^[1]; Dagotto, Elbio ^[7]; ^[1]; ^[1]; ^[1]; ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
J-PARC Center, Ibaraki (Japan); Japan Atomic Energy Agency, Ibaraki (Japan)
J-PARC Center, Ibaraki (Japan)
Comprehensive Research Organization for Science and Society, Ibaraki (Japan)
J-PARC Center, Ibaraki (Japan); High Energy Accelerator Research Organization, Ibaraki (Japan)
Univ. of Tokyo, Chiba (Japan); High Energy Accelerator Research Organization, Ibaraki (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

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. Furthermore, our results emphasize the influential role of itinerant carriers on the topological spin excitations of metallic kagome magnets.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1873833

Alternate ID(s):: OSTI ID: 1879140

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 18 Vol. 105; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Damped Dirac magnon in the metallic kagome antiferromagnet FeSn

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