Intertwined charge and spin density waves in a topological kagome material

Journal Article · Mon Jul 22 00:00:00 EDT 2024 · Physical Review Research

DOI:https://doi.org/10.1103/PhysRevResearch.6.L032016· OSTI ID:2474215

Chen, Y.; Gaudet, J.; Marcus, G. G.; Nomoto, T.; Chen, T.; Tomita, T.; Ikhlas, M.; Suzuki, H. S.; Zhao, Y.; Chen, W. C.; Strempfer, J.; Arita, R.; Nakatsuji, S.; Broholm, C.

Using neutrons and x rays we show the topological kagome antiferromagnet ${\mathrm{Mn}}_3\mathrm{Sn}$ for $T<285\mathrm{K}$ forms a homogeneous spin and charge ordered state comprising a longitudinally polarized spin density wave with wave vector ${\mathbf{k}}_{\beta }=k_{\beta }\hat{\mathbf{c}}$ , a helical modulated version of the room temperature antichiral magnetic order with ${\mathbf{k}}_{\chi }=k_{\chi }\hat{\mathbf{c}}$ , and charge density waves with wave vectors $2{\mathbf{k}}_{\beta },2{\mathbf{k}}_{\chi }$ , and ${\mathbf{k}}_{\beta }+{\mathbf{k}}_{\chi }$ . Though ${\mathbf{k}}_{\chi }$ and ${\mathbf{k}}_{\beta }$ coincide for $200\mathrm{K}<T<230\mathrm{K}$ , they exhibit distinct continuous $T\mathrm{dependencies}$ before locking to commensurate values of ${\mathbf{k}}_{\beta }=\frac{1}{12}{\mathbf{c}}^{*}$ and ${\mathbf{k}}_{\chi }=\frac{5}{48}{\mathbf{c}}^{*}$ at $\mathrm{low}T$ . 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.

Published by the American Physical Society 2024

• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC02-06CH11357; SC0019331
• OSTI ID: 2474215
• Journal Information: Physical Review Research, Journal Name: Physical Review Research Journal Issue: 3 Vol. 6; ISSN PPRHAI; ISSN 2643-1564
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English