Disordered charge density waves in the kagome metal FeGe
arXiv:2410.18063 · doi:10.1103/PhysRevB.111.045160
Abstract
The discovery of a charge density wave (CDW) in the antiferromagnetic kagome metal FeGe has prompted interest in the interplay between kagome physics, CDW, and magnetism. However, a crucial aspect for understanding these emergent phenomena-the precise CDW structure-remains ambiguous. Recent studies have assumed uniformly distributed Ge dimers, but this assumption is problematic. The predicted band structure based on this model exhibits an abrupt disappearance of a Ge- band in the Fermi surface, contradicting experimental observations from angle-resolved photoemission spectroscopy (ARPES). In this study, we propose that a CDW phase with disordered Ge dimers can reconcile theoretical predictions with ARPES results. This model reproduces the observed CDW gaps while preserving the Ge- band. Depending on experimental conditions, Ge dimers can be randomly distributed or exhibit phase separation from pristine regions. Our findings reveal the crucial role of Ge dimer disorder in the FeGe CDW and suggest potential implications of this disorder for other properties, such as magnetism and transport, in this system.
Supplementary included
References in corpus (8)
- The Alloy Theoretic Automated Toolkit: A User Guide
- Annealing-tunable charge density wave in the kagome antiferromagnet FeGe
- Competing itinerant and local spin interactions in kagome metal FeGe
- 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
- Symmetry breaking and ascending in the magnetic kagome metal FeGe
- Encoding innumerable charge density waves of FeGe into polymorphs of LiFe6Ge6