The combination of a geometrically frustrated lattice, and similar energy scales between degrees of freedom endows two-dimensional Kagome metals with a rich array of quantum phases and renders them ideal for studying strong electron correlations and band topology. The Kagome metal, FeGe is a noted example of this, exhibiting A-type collinear antiferromagnetic (AFM) order at
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Abstract T N ≈ 400 K, then establishes a charge density wave (CDW) phase coupled with AFM ordered moment belowT CDW ≈ 110 K, and finally forms ac -axis double cone AFM structure aroundT Canting ≈ 60 K. Here we use neutron scattering to demonstrate the presence of gapless incommensurate spin excitations associated with the double cone AFM structure of FeGe at temperatures well aboveT CantingandT CDWthat merge into gapped commensurate spin waves from the A-type AFM order. Commensurate spin waves follow the Bose factor and fit the Heisenberg Hamiltonian, while the incommensurate spin excitations, emerging belowT Nwhere AFM order is commensurate, start to deviate from the Bose factor aroundT CDW, and peaks atT Canting. This is consistent with a critical scattering of a second order magnetic phase transition with decreasing temperature. By comparing these results with density functional theory calculations, we conclude that the incommensurate magnetic structure arises from the nested Fermi surfaces of itinerant electrons and the formation of a spin density wave order. -
Chen, Lebing ; Chung, Jae-Ho ; Chen, Tong ; Duan, Chunruo ; Schneidewind, Astrid ; Radelytskyi, Igor ; Voneshen, David J. ; Ewings, Russell A. ; Stone, Matthew B. ; Kolesnikov, Alexander I. ; et al ( , Physical Review B)