Chiral and flat-band magnetic cluster excitations in a ferromagnetic kagome metal
S. X. M. Riberolles (1), Tyler J. Slade (1), Tianxiong Han (1,2), Bing, Li (1,2), D. L. Abernathy (3), P. C. Canfield (1,2), B. G. Ueland (1), P. P., Orth (1,2), Liqin Ke (1), R. J. McQueeney (1,2) ((1) Ames Laboratory, Ames,, IA, USA, (2) Department of Physics, Astronomy
TL;DR
This paper investigates magnetic excitations in the kagome metal TbMn6Sn6, revealing localized chiral and flat-band spin correlations instead of conventional magnon modes, highlighting complex magnetic dynamics influenced by topology and spin-orbit coupling.
Contribution
It uncovers the presence of overdamped chiral and flat-band spin correlations localized within kagome layers, contrasting with expected collective magnon modes.
Findings
Overdamped chiral spin correlations observed
Flat-band spin correlations localized to hexagons
Deviation from conventional magnon behavior
Abstract
TbMn6Sn6 is a metallic ferrimagnet that displays signatures of band topology arising from a combination of uniaxial ferromagnetism and spin-orbit coupling within its Mn kagome layers. Whereas the low energy magnetic excitations can be described as collective spin waves using a local moment Heisenberg model, sharply defined optical and flat-band collective magnon modes are not observed. In their place, we find overdamped chiral and flat-band spin correlations that are localized to hexagonal plaquettes within the kagome layer.
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Taxonomy
TopicsTopological Materials and Phenomena · Advanced Condensed Matter Physics · Quantum many-body systems