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Low-Temperature Competing Magnetic Energy Scales in the Topological Ferrimagnet TbMn 6 Sn 6

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 l...

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Published in:	Physical review. X 2022-05, Vol.12 (2), Article 021043
Main Authors:	Riberolles, S. X. M., Slade, Tyler J., Abernathy, D. L., Granroth, G. E., Li, Bing, Lee, Y., Canfield, P. C., Ueland, B. G., Ke, Liqin, McQueeney, R. J.
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Subjects:	CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY first principles calculations interactions and forces magnetic anisotropy magnetic coupling magnetic interactions magnetic order magnetism order parameters phase transitions topological materials
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container_title	Physical review. X
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creator	Riberolles, S. X. M. Slade, Tyler J. Abernathy, D. L. Granroth, G. E. Li, Bing Lee, Y. Canfield, P. C. Ueland, B. G. Ke, Liqin McQueeney, R. J.
description	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
doi_str_mv	10.1103/PhysRevX.12.021043
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X. M. ; Slade, Tyler J. ; Abernathy, D. L. ; Granroth, G. E. ; Li, Bing ; Lee, Y. ; Canfield, P. C. ; Ueland, B. G. ; Ke, Liqin ; McQueeney, R. J.</creator><creatorcontrib>Riberolles, S. X. M. ; Slade, Tyler J. ; Abernathy, D. L. ; Granroth, G. E. ; Li, Bing ; Lee, Y. ; Canfield, P. C. ; Ueland, B. G. ; Ke, Liqin ; McQueeney, R. J. ; Ames Laboratory (AMES), Ames, IA (United States) ; Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)</creatorcontrib><description>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. 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subjects	CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY first principles calculations interactions and forces magnetic anisotropy magnetic coupling magnetic interactions magnetic order magnetism order parameters phase transitions topological materials
title	Low-Temperature Competing Magnetic Energy Scales in the Topological Ferrimagnet TbMn 6 Sn 6
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