Spin excitations in the kagome-lattice metallic antiferromagnet Fe0.89Co0.11Sn

Xie, Tao; Yin, Qiangwei; Wang, Qi; Kolesnikov, Alexander I.; Granroth, Garrett E.; Abernathy, Douglas L.; Gong, Dongliang; Yin, Zhiping; Lei, Hechang; Podlesnyak, Andrey A.

doi:10.1103/physrevb.106.214436

Spin excitations in the kagome-lattice metallic antiferromagnet Fe 0.89 Co 0.11 Sn

Journal Article · Mon Dec 26 04:00:00 EST 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.106.214436· OSTI ID:1907240

^[1]; Yin, Qiangwei ^[2]; Wang, Qi ^[2]; ^[1]; ^[1]; ^[1]; Gong, Dongliang ^[3]; Yin, Zhiping ^[4]; Lei, Hechang ^[2]; ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Renmin Univ. of China, Beijing (China)
Univ. of Tennessee, Knoxville, TN (United States)
Beijing Normal University (China)

Kagome-lattice materials have attracted tremendous interest due to the broad prospect for seeking superconductivity, quantum spin liquid states, and topological electronic structures. Among them, the transition-metal kagome lattices are high-profile objects for the combination of topological properties, rich magnetism, and multiple-orbital physics. Here we report an inelastic neutron scattering study on the spin dynamics of a kagome-lattice antiferromagnetic metal Fe_0.89Co_0.11Sn. Although the magnetic excitations can be observed up to ~250 meV, well-defined spin waves are only identified below ~90 meV and can be modeled using Heisenberg exchange with ferromagnetic in-plane nearest-neighbor coupling J₁, in-plane next-nearest-neighbor coupling J₂, and antiferromagnetic (AFM) interlayer coupling J_c under linear spin-wave theory. Above ~90 meV, the spin waves enter the itinerant Stoner continuum and become highly damped particle-hole excitations. At the K point of the Brillouin zone, we reveal a possible band crossing of the spin wave, which indicates a potential Dirac magnon. Finally, our results uncover the evolution of the spin excitations from the planar AFM state to the axial AFM state in Fe_0.89Co_0.11Sn, solve the magnetic Hamiltonian for both states, and confirm the significant influence of the itinerant magnetism on the spin excitations.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Ministry of Science and Technology of China; Beijing Natural Science Foundation

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1907240

Alternate ID(s):: OSTI ID: 1906769

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 21 Vol. 106; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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