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arXiv · 2110.14713

Low temperature competing magnetic energy scales in the topological ferrimagnet TbMn6Sn6

S. X. M. Riberolles·Tyler J. Slade·D. L. Abernathy·G. E. Granroth·Bing Li·Y. Lee·P. C. Canfield·B. G. Ueland·Liqin Ke·R. J. McQueeney
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Abstract

TbMn6Sn6 is a metallic ferrimagnet displaying signatures of both topological electrons and topological magnons arising from ferromagnetism and spin-orbit coupling within its Mn kagome layers. Inelastic neutron scattering measurements find strong ferromagnetic (FM) interactions within the Mn kagome layer and reveal a magnetic bandwidth of ~230 meV. The low-energy magnetic excitations are characterized by strong FM Mn-Mn and antiferromagnetic (AFM) Mn-Tb interlayer magnetic couplings. We observe weaker, competing long-range FM and AFM Mn-Mn interlayer interactions similar to those driving helical magnetism in the YMn6Sn6 system. Combined with density-functional theory calculations, we find that competing Mn-Mn interlayer magnetic interactions occur in all RMn6Sn6 compounds with R= Y, Gd-Lu, resulting in magnetic instabilities and tunability when Mn-R interactions are weak. In the case of TbMn6Sn6, strong AFM Mn-Tb coupling ensures a highly stable three-dimensional ferrimagnetic network.

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S. X. M. Riberolles, Tyler J. Slade, D. L. Abernathy, G. E. Granroth, Bing Li, Y. Lee, P. C. Canfield, B. G. Ueland, Liqin Ke, R. J. McQueeney. 2021-10-27. Low temperature competing magnetic energy scales in the topological ferrimagnet TbMn6Sn6. https://arxiv.org/abs/2110.14713

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