Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session T02: Kagome Magnetic Weyl Semimetals
11:30 AM–2:30 PM,
Thursday, March 7, 2024
Room: L100B
Sponsoring
Units:
DMP GMAG
Chair: Nirmal Ghimire, George Mason University
Abstract: T02.00009 : Low-Temperature Competing Magnetic Interactions in the Topological RMn6Sn6 Kagome Metals*
1:30 PM–1:42 PM
Presenter:
Fei Li
(Ames National Laboratory)
Authors:
Fei Li
(Ames National Laboratory)
Tianxiong Han
(Iowa State University, Ames National Laboratory)
Simon X Riberolles
(Ames National Laboratory)
Tyler J Slade
(Ames National Laboratory)
Douglas L Abernathy
(Oak Ridge National Lab)
Garrett E Granroth
(Oak Ridge National Lab)
Bing Li
(Argonne National Laboratory)
Yongbin Lee
(Iowa State University)
Paul C Canfield
(Iowa State University)
Benjamin G Ueland
(Ames National Laboratory)
Liqin Ke
(Ames National Laboratory)
Robert J McQueeney
(Iowa State University)
The RMn6Sn6 (R166, R = rare earth) hexagonal kagome metals show intriguing topological and magnetic properties which depend on the choice of R. Here, we present inelastic neutron scattering (INS) studies of R166 for R = Tb, Ho and Er. All three compounds exhibit ferrimagnetic order at low-temperature, but Er166 has an intermediate temperature triple-spiral phase with an incommensurate antiferromagnetic (AFM) propagation vector. Our INS data show that all three compounds have strong ferromagnetic (FM) interactions within individual Mn layers but differing temperature-dependent magnetic anisotropies. Strong FM interactions within a Mn layer determines the overall magnetic bandwidth of ∼ 230 meV. The low-energy magnetic excitations are characterized by strong FM Mn-Mn and AFM Mn-R nearest-neighbor interlayer exchange, as well as weaker and competing longer range FM and AFM Mn-Mn interlayer exchange. Competition between the interlayer interactions and also between the Mn easy-plane and R uniaxial anisotropies reveals itself with changing temperature as an energy shift of the R magnon band associated with the thermal population of R crystalline-electric-field levels. Our data confirm density-functional-theory calculations, which find that competing Mn-Mn interlayer magnetic interactions occur in all R166 compounds with R = Y, Gd-Lu, which in turn results in magnetic instabilities and tunability when Mn-R interactions are weak.
*Work at the Ames National Laboratory was supported by the Department of Energy, Basic Energy Sciences under Contract No. DE-AC02-07CH11358. This work was also supported by the Center for the Advancement of Topological Semimetals (CATS), an Energy Frontier Research Center at the Ames National Laboratory. 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.
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