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The combination of non-trivial band topology and symmetry breaking phasesgives rise to novel quantum states and phenomena such as topologicalsuperconductivity, quantum anomalous Hall effect and axion electrodynamics.Evidence of intertwined charge density wave (CDW) and superconducting orderparameters has recently been observed in a novel kagome material AV3Sb5(A=K,Rb,Cs) that features a Z2 topological invariant in the electronicstructure. However, the origin of the CDW and its intricate interplay withtopological state has yet to be determined. Here, using hard x-ray scattering,we demonstrate a three-dimensional (3D) CDW with 2*2*2 superstructure in(Rb,Cs)V3Sb5. Unexpectedly, we find that the CDW fails to induce acousticphonon anomalies at the CDW wavevector but yields a novel Raman mode whichquickly damps into a broad continuum below the CDW transition temperature. Ourobservations exclude strong electron-phonon coupling driven CDW in AV3Sb5 andpoint to an unconventional and electronic-driven mechanism that couples the CDWand the topological band structure.

Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV3Sb5 (A=Rb,Cs)