Topological magnon bands in a room-temperature kagome magnet

Zhang, H. D.; Feng, X.; Heitmann, T. W.; Kolesnikov, Alexander I.; Stone, Matthew B.; Lu, Y. -M.; Ke, X.

doi:10.1103/physrevb.101.100405

Topological magnon bands in a room-temperature kagome magnet

Journal Article · Mon Mar 16 00:00:00 EDT 2020 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.101.100405· OSTI ID:1798567

Zhang, H. D. ^[1]; Feng, X. ^[2]; Heitmann, T. W. ^[3]; ^[4]; ^[4]; Lu, Y. -M. ^[2]; Ke, X. ^[1]

Michigan State Univ., East Lansing, MI (United States)
The Ohio State Univ., Columbus, OH (United States)
Univ. of Missouri, Columbia, MO (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Topological magnon is a vibrant research field gaining more and more attention in the past few years. Among many theoretical proposals and limited experimental studies, ferromagnetic kagome lattice emerges as one of the most elucidating systems. Here we report neutron scattering studies of YMn₆Sn₆, a metallic system consisting of ferromagnetic kagome planes. This system undergoes a commensurate-to-incommensurate antiferromagnetic phase transition upon cooling with the incommensurability along the out-of-plane direction. We observe magnon band gap opening at the symmetry-protected K points and ascribe this feature to the antisymmetric Dzyaloshinskii-Moriya (DM) interactions. Our observation supports the existence of topological Dirac magnons in both the commensurate collinear and incommensurate coplanar magnetic orders, which is further corroborated by symmetry analysis. This finding places YMn₆Sn₆ as a promising candidate for room-temperature magnon spintronics applications.

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). Scientific User Facilities Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1798567

Alternate ID(s):: OSTI ID: 1604849

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 10 Vol. 101; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Effects of exchange distortions in the magnetic Kagome lattice Coker, A. A.; Saxena, A.; Haraldsen, J. T. arXiv https://doi.org/10.48550/arxiv.2012.00910	text	January 2020
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