Chiral and flat-band magnetic cluster excitations in a ferromagnetic kagome metal

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.

6 pages, 5 figures

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Cited by in corpus (7)

• Spin-charge-lattice coupling across the charge density wave transition in a Kagome lattice antiferromagnet
• Persistent flat band splitting and strong selective band renormalization in a kagome magnet thin film
• High-field magnetic phase diagrams of the $\text{R}$Mn${}_6$Sn${}_6$ kagome metals
• Room temperature quantum metric effect in TbMn6Sn6
• Slow ferromagnetic fluctuations in the kagome metal Sc${}_3$Mn${}_3$Al${}_7$Si${}_5$ revealed by ${}^{27}$Al NMR
• Multiple topological phases of magnons induced by Dzyaloshinskii-Moriya and pseudodipolar anisotropic exchange interactions in Kagome ferromagnets
• Omnidirectional magnetic imaging of magnetic anisotropy and phase transitions