Intertwined Charge and Spin Density Waves in a Topological Kagome Material

Published

July 22, 2024

Author(s)

Y. Chen, Jonathan N. Gaudet, G. Marcus, T. Nomoto, T. Chen, T. Tomita, M. Ikhlas, H. Suzuki, Yang Zhao, Wangchun Chen, J. Strempfer, R. Arita, S. Nakatsuji, Collin L. Broholm

Abstract

Using neutrons and x rays we show the topological kagome antiferromagnet Mn3Sn for T < 285 K forms a homogeneous spin and charge ordered state comprising a longitudinally polarized spin density wave with wave vector kβ = kβ ˆc, a helical modulated version of the room temperature antichiral magnetic order with kχ = kχ ˆc, and charge density waves with wave vectors 2kβ, 2kχ, and kβ + kχ. Though kχ and kβ coincide for 200 K < T < 230 K, they exhibit distinct continuous T dependencies before locking to commensurate values of kβ = 1 12 c∗ and kχ = 5 48 c∗ at low T. 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.

Citation

Physical Review Research

Volume

6

Issue

3

Pub Type

Journals

Download Paper

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

Local Download

Keywords

Polarized neutron diffraction, Inelastic neutron scattering, x-ray diffraction, Weyl semimetal

Citation

Chen, Y. , Gaudet, J. , Marcus, G. , Nomoto, T. , Chen, T. , Tomita, T. , Ikhlas, M. , Suzuki, H. , Zhao, Y. , Chen, W. , Strempfer, J. , Arita, R. , Nakatsuji, S. and Broholm, C. (2024), Intertwined Charge and Spin Density Waves in a Topological Kagome Material, Physical Review Research, [online], https://doi.org/10.1103/PhysRevResearch.6.L032016, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=956271 (Accessed October 9, 2025)