Annealing-tunable charge density wave in the kagome antiferromagnet FeGe

Abstract

The unprecedented phenomenon that a charge density wave (CDW) emerges inside the antiferromagnetic (AFM) phase indicates an unusual CDW mechanism associated with magnetism in FeGe. Here, we demonstrate that both the CDW and magnetism of FeGe can be effectively tuned through post-growth annealing treatments. Instead of the short-range CDW reported earlier, a long-range CDW order is realized below 110 K in single crystals annealed at \SI{320}{\degreeCelsius} for over 48 h. The CDW and AFM transition temperatures appear to be inversely correlated with each other. The entrance of the CDW phase significantly reduces the critical field of the spin-flop transition, whereas the CDW transition remains stable against minor variations in magnetic orders such as annealing-induced magnetic clusters and spin-canting transitions. Single-crystal x-ray diffraction measurements reveal substantial disorder on the Ge1 site, which is characterized by displacement of the Ge1 atom from Fe${}_3$Ge layer along the $c$ axis and can be reversibly modified by the annealing process. The observed annealing-tunable CDW and magnetic orders can be well understood in terms of disorder on the Ge1 site. Our study provides a vital starting point for the exploration of the unconventional CDW mechanism in FeGe and of kagome materials in general.

Accepted by Physical Review Letters

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Cited by in corpus (20)

• Spin-phonon coupling driven Charge density wave in a Kagome Magnet
• Intriguing Low-Temperature Phase in the Antiferromagnetic Kagome Metal FeGe
• Spin-charge-lattice coupling across the charge density wave transition in a Kagome lattice antiferromagnet
• Annealing-induced long-range charge density wave order in magnetic kagome FeGe: fluctuations and disordered structure
• 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
• Kagome metals
• Charge Dynamics of an Unconventional Three-Dimensional Charge Density Wave in Kagome FeGe
• Anisotropic transport properties and topological Hall effect in the annealed kagome antiferromagnet FeGe
• Instability of the charge density wave in Kagome magnet FeGe
• Tunability of charge density wave in a magnetic kagome metal
• Disordered charge density waves in the kagome metal FeGe
• Vacancy-induced suppression of CDW order and its impact on magnetic order in kagome antiferromagnet FeGe
• Interplay of Charge Density Wave and Magnetism on the Kagomé Lattice
• Anomalous Nernst Effect and Its Implications for Time-Reversal Symmetry Breaking in Kagome Metal ScV6Sn6
• Interacting spin and charge density waves in kagome metal FeGe
• Beyond kagome: $p$-bands in kagome metals
• Epitaxial growth and magneto-transport properties of kagome metal FeGe thin films
• Thermoelectric evidence of the electronic structure changes from the charge-density-wave transition in FeGe
• Single crystal growth, structural and physical properties, and absence of a charge density wave in Ti_{0.85}Fe6Ge6
• Vacancy Order and Physical Properties of a Ternary Compound Fe0.68Pd0.80Te with an α-Fe1+xTe-Type Structure