Soft Mode Origin of Charge Ordering in Superconducting Kagome CsVSb
By combining high-resolution inelastic X-ray scattering with first-principles calculations, this study identifies a soft phonon mode at the L point along the M-L direction as the driving mechanism for charge-density-wave formation in the kagome metal CsVSb, thereby clarifying the central role of lattice dynamics in its intertwined phases with superconductivity.