S. Siddique; M. Klemm; Q. Tang; M.T. Kiani; M. Hassani; P. Dai; J.J. Cha
Microscopy and Microanalysis 31 (2025)
Charge-density wave (CDW) is an electronic state characterized by modulations of the electron density and periodic lattice distortions [1]. Like other correlated electronic states, systems with CDWs exhibit strong electron-electron and electron-phonon interactions and hence CDW phases are often found near superconductivity and magnetism in the phase diagrams [2]. Studying CDWs is thus critical to understand the interplay between different correlated states and help reveal factors that govern the stability and transitions of these states. Recently, kagome-lattice FeGe (B35 phase) has been shown to exhibit a CDW phase transition at TCDW ≈ 100 K, far below the antiferromagnetic (AFM) ordering temperature (TN ≈ 410 K) [3]. Not only is FeGe the first system to have CDW order within an AFM order, the onset of CDW enhances the AFM moment and induces an anomalous Hall effect, indicating CDW is closely intertwined with the magnetic order in FeGe. This observation, combined with the inherent geometric frustration and flat bands of the kagome lattice that results in non-trivial electronic behavior, makes FeGe a unique platform to explore novel correlated behaviors, including CDW.