Chiral and flat-band magnetic quasiparticles in ferromagnetic and metallic kagome layers

Riberolles, S. X. M.; Slade, Tyler J.; Han, Tianxiong; Li, Bing; Abernathy, D. L.; Canfield, P. C.; Ueland, B. G.; Orth, P. P.; Ke, Liqin; McQueeney, R. J.

doi:10.1038/s41467-024-45841-8

Title: Chiral and flat-band magnetic quasiparticles in ferromagnetic and metallic kagome layers

Journal Article · 21 February 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-45841-8 · OSTI ID:2310435

^[1]; Slade, Tyler J. ^[1];

^[2];

^[3]; Canfield, P. C. ^[2];

^[1]; Orth, P. P. ^[2];

^[1]; McQueeney, R. J. ^[2]

Ames Laboratory (AMES), Ames, IA (United States)
Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Magnetic kagome metals are a promising platform to develop unique quantum transport and optical phenomena caused by the interplay between topological electronic bands, strong correlations, and magnetic order. This interplay may result in exotic quasiparticles that describe the coupled electronic and spin excitations on the frustrated kagome lattice. Here, we observe novel elementary magnetic excitations within the ferromagnetic Mn kagome layers in TbMn₆Sn₆ using inelastic neutron scattering. We observe sharp, collective acoustic magnons and identify flat-band magnons that are localized to a hexagonal plaquette due to the special geometry of the kagome layer. Surprisingly, we observe another type of elementary magnetic excitation; a chiral magnetic quasiparticle that is also localized on a hexagonal plaquette. The short lifetime of localized flat-band and chiral quasiparticles suggest that they are hybrid excitations that decay into electronic states.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

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

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2310435

Alternate ID(s):: OSTI ID: 2311093

Report Number(s):: IS-J-11,273

Journal Information:: Nature Communications, Vol. 15, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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