![]() We employ a symmetry analysis, complementary lattice dynamics calculations, polarizer/analyzer combinations, and chemical substitution on the R site to assign the excitations. Raman-active phonons of ScV 6Sn 6 at 300 Kįigure 1b summarizes the Raman scattering response of ScV 6Sn 6 at room temperature. These findings revise our understanding of phonons and their mixing processes in ScV 6Sn 6 related materials. We therefore establish that density wave stability is impacted by both physical and chemical pressure. We also demonstrate that compression at room temperature may quench the recently reported short-range CDW in ScV 6Sn 6 but has no effect on the Lu analog. We discuss this multiplet structure in terms of mixing of nearby symmetry-appropriate and zone-folded phonons, specifically those of A 1 g, E g, and P symmetries. In the low temperature phase, we find at least four new peaks in the vicinity of the V-containing totally symmetric mode near 240 cm −1 suggesting that the density wave acts to mix modes of P6/ m m m and \(R\barm\) symmetry. In this work, we combine Raman scattering spectroscopy with first-principles lattice dynamics calculations to reveal phonon mixing processes in the charge density wave state of ScV 6Sn 6. In the RV 6Sn 6 family of materials ( R = Sc, Y, Lu), ScV 6Sn 6 hosts an unusual charge density wave ground state as well as structural similarities with the AV 3Sb 5 system ( A = K, Cs, Rb). Kagomé metals are widely recognized, versatile platforms for exploring topological properties, unconventional electronic correlations, magnetic frustration, and superconductivity.
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