Chiral magnetic excitations in the RMn6Sn6 kagome metals (R=Tb, Ho, Er, and Y)
Abstract
Recent inelastic neutron scattering (INS) investigations of the kagome metal TbMn6Sn6 reveal novel chiral magnetic excitations associated with the kagome layer. These excitations appear to have an itinerant character with a large energy scale (> 100 meV) and heavy damping; however, the origin of these excitations, which are not predicted by local moment linear spin-wave theory, is not understood. Here, we use INS to show that chiral excitations are also found in RMn6Sn6 compounds with R=Tb, Ho, Er, and Y having uniaxial, tilted, planar ferrimagnet, and planar double-spiral magnetic structures, respectively. Thus, the chiral excitations exist regardless of the magnetic structure. Additionally, R=Er and Y demonstrate that the chiral mode intensity is weaker in planar magnetic structures, suggesting that excitations are transverse to the local Mn moment direction. The chiral excitations appear only at L=odd positions in the Brilloun zone, and correspond to chiral spin exciations of the same handedness within each kagome layer, and pi out-of-phase between layers.
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BibTeX
@misc{ranlett2026chiral,
title = {{Chiral magnetic excitations in the RMn6Sn6 kagome metals (R=Tb, Ho, Er, and Y)}},
author = {Christopher J. Ranlett and Tianxiong Han and S. X. M. Riberolles and Dhurba R. Jaishi and Tyler J. Slade and Bing Li and A. Sapkota and D. L. Abernathy and Rebecca L. Dally and J. W. Lynn and B. G. Ueland and R. J. McQueeney},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.27430},
eprint = {2610.27430},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.27430},
}
RIS
TY - UNPB
TI - Chiral magnetic excitations in the RMn6Sn6 kagome metals (R=Tb, Ho, Er, and Y)
AU - Christopher J. Ranlett
AU - Tianxiong Han
AU - S. X. M. Riberolles
AU - Dhurba R. Jaishi
AU - Tyler J. Slade
AU - Bing Li
AU - A. Sapkota
AU - D. L. Abernathy
AU - Rebecca L. Dally
AU - J. W. Lynn
AU - B. G. Ueland
AU - R. J. McQueeney
PY - 2026
DA - 2026/10/20
PB - arXiv
DO - 10.48550/arxiv.2610.27430
UR - https://arxiv.org/abs/2610.27430
AB - Recent inelastic neutron scattering (INS) investigations of the kagome metal TbMn6Sn6 reveal novel chiral magnetic excitations associated with the kagome layer. These excitations appear to have an itinerant character with a large energy scale (> 100 meV) and heavy damping; however, the origin of these excitations, which are not predicted by local moment linear spin-wave theory, is not understood. Here, we use INS to show that chiral excitations are also found in RMn6Sn6 compounds with R=Tb, Ho, Er, and Y having uniaxial, tilted, planar ferrimagnet, and planar double-spiral magnetic structures, respectively. Thus, the chiral excitations exist regardless of the magnetic structure. Additionally, R=Er and Y demonstrate that the chiral mode intensity is weaker in planar magnetic structures, suggesting that excitations are transverse to the local Mn moment direction. The chiral excitations appear only at L=odd positions in the Brilloun zone, and correspond to chiral spin exciations of the same handedness within each kagome layer, and pi out-of-phase between layers.
ER -