Intertwined Charge and Spin Density Waves in a Topological Kagome Material

Abstract

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

6 pages, 4 figures

References in corpus (20)

• Weyl and Dirac Semimetals in Three Dimensional Solids
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Large anomalous Nernst effect at room temperature in a chiral antiferromagnet
• Discovery of unconventional chiral charge order in kagome superconductor KV3Sb5
• Evidence for Magnetic Weyl Fermions in a Correlated Metal
• Superconductivity in the ${\mathbb{Z}}_2$ kagome metal KV${}_3$Sb${}_5$
• Anomalous Nernst and Righi-Leduc effects in Mn${}_3$Sn: Berry curvature and entropy flow
• Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV3Sb5 (A=Rb,Cs)
• Discovery of charge density wave in a correlated kagome lattice antiferromagnet
• Novel magnetic states and nematic spin chirality in the kagome lattice metal YMn${}_6$Sn${}_6$
• Anomalous transport due to Weyl fermions in the chiral antiferromagnets Mn${}_3$$X$, $X$ = Sn, Ge
• Intertwined magnetism and charge density wave order in kagome FeGe
• Anomalous Hall effect and topological defects in antiferromagnetic Weyl semimetals: Mn${}_3$Sn/Ge
• Magnetic Phase Dependence of the Anomalous Hall Effect in Mn${}_3$Sn Single Crystals
• Magnetic Excitations in Non-Collinear Antiferromagnetic Weyl Semimetal $\mathsf{M}{\mathsf{n}}_3\mathsf{Sn}$
• Kondo physics in antiferromagnetic Weyl semimetal Mn3+xSn1-x films
• Ground state magnetic structure of Mn${}_3$Ge
• Antichiral spin order its Goldstone modes and their hybridization with phonons in the topological semimetal Mn3Ge
• Theory of spin waves in a hexagonal antiferromagnet

Cited by in corpus (4)

• Magnetic Phase Diagram of Mn3+xSn1-x Epitaxial Thin Films: Extending the Anomalous Hall Effect to Low Temperatures via Intrinsic Alloying
• Hydrostatic and chemical pressure driven crossover from commensurate to the incommensurate state of the Weyl semimetal Mn${}_{3+x}$Sn${}_{1-x}$
• Engineering magnetic anisotropy and ferromagnetism in topological Kagome metal GdV6Sn6 via Nd substitution
• Ab initio study of magnetoresistance effect in $\mathrm{M}{\mathrm{n}}_3\mathrm{Sn}/\mathrm{MgO}/\mathrm{M}{\mathrm{n}}_3\mathrm{Sn}$ antiferromagnetic tunnel junction