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  • Letter
  • Open Access

Intertwined charge and spin density waves in a topological kagome material

Y. Chen1,2,3, J. Gaudet1,4,5, G. G. Marcus1, T. Nomoto6, T. Chen7, T. Tomita7, M. Ikhlas7, H. S. Suzuki7, Y. Zhao4,5 et al.

W. C. Chen4, J. Strempfer8, R. Arita6,9, S. Nakatsuji1,7,10,11,12, and C. Broholm1,4,13

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Phys. Rev. Research 6, L032016 – Published 22 July, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L032016

Abstract

Using neutrons and x rays we show the topological kagome antiferromagnet Mn3Sn for T<285K forms a homogeneous spin and charge ordered state comprising a longitudinally polarized spin density wave with wave vector kβ=kβĉ, a helical modulated version of the room temperature antichiral magnetic order with kχ=kχĉ, and charge density waves with wave vectors 2kβ,2kχ, and kβ+kχ. Though kχ and kβ coincide for 200K<T<230K, they exhibit distinct continuous Tdependencies before locking to commensurate values of kβ=112c* and kχ=548c* at lowT. Density functional theory indicates this complex modulated state may be associated with the nesting of Fermi surfaces from correlated flat kagome bands, which host Weyl nodes that are annihilated as it forms.

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Phys. Rev. Research 6, L032016– Published 22 July, 2024
  • Received 12 June 2023
  • Revised 20 March 2024
  • Accepted 15 May 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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