Spin-phonon coupling driven Charge density wave in a Kagome Magnet

Abstract

The intertwining between spin, charge, and lattice degrees of freedom can give rise to unusual macroscopic quantum states, including high-temperature superconductivity and quantum anomalous Hall effects. Recently, a charge density wave (CDW) is observed in the kagome antiferromagnet FeGe, indicative of possible intertwining physics. An outstanding question is that whether magnetic correlation is fundamental for the spontaneous spatial symmetry breaking orders. Here, utilizing elastic and high-resolution inelastic x-ray scattering, we discover a charge dimerization superlattice that coexists with the 2$\times$2$\times$1 CDW in the kagome sublattice. Most interestingly, between the magnetic and CDW transition temperature, the phonon dynamical structure factor shows a giant phonon-energy hardening and a substantial phonon linewidth broadening near the charge-dimerization wavevectors, both signaling the spin-phonon coupling. By first principles calculations, we show that both the static and dynamic spin excitations intertwine with the phonon to drive the spatial symmetry breaking.

The data that support the findings of this study are available from the corresponding author on reasonable request

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• Annealing-induced long-range charge density wave order in magnetic kagome FeGe: fluctuations and disordered structure
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• FeGe as a building block for the kagome 1:1, 1:6:6, and 1:3:5 families: hidden d-orbital decoupling of flat band sectors, effective models and interaction Hamiltonians
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• Charge Dynamics of an Unconventional Three-Dimensional Charge Density Wave in Kagome FeGe
• Electronic band structures of topological kagome materials
• Anisotropic transport properties and topological Hall effect in the annealed kagome antiferromagnet FeGe
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• Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe
• Orbital-selective effect of spin reorientation on the Dirac fermions in a non-charge-ordered kagome ferromagnet Fe${}_3$Ge
• Vacancy-induced suppression of CDW order and its impact on magnetic order in kagome antiferromagnet FeGe
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• Lattice dynamics study of electron-correlation-induced charge density wave in antiferromagnetic kagome metal FeGe
• Encoding innumerable charge density waves of FeGe into polymorphs of LiFe6Ge6
• Interplay of Charge Density Wave and Magnetism on the Kagomé Lattice
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• Competing Lattice Instability and Magnetism on the Surface of Kagome Metals
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• Origin of the charge density wave state in BaFe${}_2$Al${}_9$
• Magnetism of kagome metals $\left({\text{Fe}}_{1-x}{\text{Co}}_x\right)\text{Sn}$ studied by $\mu$SR
• Beyond kagome: $p$-bands in kagome metals
• Single crystal growth, structural and physical properties, and absence of a charge density wave in Ti_{0.85}Fe6Ge6
• Epitaxial growth and magneto-transport properties of kagome metal FeGe thin films