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

doi:10.1103/PhysRevX.12.021043

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

Direct Geometry

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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.

Original language	English
Article number	021043
Journal	Physical Review X
Volume	12
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevX.12.021043
State	Published - Jun 2022

Funding

The work of R. J. M., L. K., Y. L., B. G. U., B. L., and S. X. M. R. at the Ames Laboratory is supported by the U.S. Department of Energy (U.S. DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering. T. J. S. and P. C. C. are supported by the Center for the Advancement of Topological Semimetals (CATS), an Energy Frontier Research Center funded by the U.S. DOE Office of Science, Office of Basic Energy Sciences, through the Ames Laboratory. Ames Laboratory is operated for the U.S. DOE by Iowa State University under Contract No. DE-AC02-07CH11358. T. J. S. is also partially funded by the Gordon and Betty Moore Foundation (Grant No. GBMF4411). A portion of this research used resources at the Spallation Neutron Source, which is a U.S. DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. L. K. is supported by the U.S. DOE, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, and Early Career Research Program. A portion of this research used resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. DOE Office of Science User Facility operated under Contract No. DE-AC02-05CH11231.

Funders	Funder number
U.S. Department of Energy
Gordon and Betty Moore Foundation	GBMF4411
Office of Science	DE-AC02-05CH11231
Basic Energy Sciences
Iowa State University	DE-AC02-07CH11358
Ames Laboratory
Division of Materials Sciences and Engineering

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title = "Low-Temperature Competing Magnetic Energy Scales in the Topological Ferrimagnet TbMn6Sn6",

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.",

author = "Riberolles, {S. X.M.} and Slade, {Tyler J.} and Abernathy, {D. L.} and Granroth, {G. E.} and Bing Li and Y. Lee and Canfield, {P. C.} and Ueland, {B. G.} and Liqin Ke and McQueeney, {R. J.}",

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AU - Abernathy, D. L.

AU - Granroth, G. E.

AU - Li, Bing

AU - Lee, Y.

AU - Canfield, P. C.

AU - Ueland, B. G.

AU - Ke, Liqin

AU - McQueeney, R. J.

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N2 - 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.

AB - 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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Low-Temperature Competing Magnetic Energy Scales in the Topological Ferrimagnet TbMn6Sn6

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