摘要
FeGe is the only known kagome metal hosting the coexistence of long-range magnetic order and charge-density-wave (CDW) order, making it an exceptional platform for studying spin-charge-lattice entanglement. Despite extensive experimental and theoretical efforts, the microscopic origin of the CDW in FeGe remains under active debate. In this work, we reveal how in-plane tensile strain reshapes the hierarchy of competing CDW orders in the antiferromagnetic kagome metal FeGe. First-principles phonon calculations uncover two Kohn-anomaly-induced incommensurate CDWs under strain, while slight electron correlations suppress these modes and instead lead to unconventional correlation-driven CDW phases. Notably, a previously unreported fully dimerized √3×√3×2 CDW emerges from the softened H-point phonon mode. Total-energy analyses establish a strain-induced phase transition sequence: 2×2×2→√3×√3×2→ fully dimerized √3×√3×2 at strains of ∼0.6% and ∼2.4%, respectively, while a small U = 0.2 eV will reduce the required strain to ∼0.2% and ∼1.8%, respectively. These results demonstrate the coexistence of electron-phonon-driven and correlation-driven CDW mechanisms, positioning strained FeGe as a powerful platform for probing strongly coupled spin-charge-lattice entanglement in correlated magnetic kagome systems. © 2026 authors. Published by the American Physical Society.