2026-10-12T18:58:14Zhttps://www.radar-service.eu/oai/OAIHandler

10.35097/17712026-10-09T11:00:30Zradar4kit

https://dx.doi.org/10.35097/1771 Weber, Frank Shen, Xingchen Heid, Rolf Hott, Roland Haghighirad, Amir-Abbas Salzmann, Björn Cantarino, Marli dos Reis Monney, Claude Said, Ayman H. Frachet, Mehdi Murphy, Bridget Rossnagel, Kai Rosenkranz, Stephan Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe$_2$ Karlsruhe Institute of Technology 2023 Physics dataset Dataset info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode Research on charge-density-wave (CDW) ordered transition-metal dichalcogenides continues to unravel new states of quantum matter correlated to the intertwined lattice and electronic degrees of freedom. Here, we report an inelastic x-ray scattering investigation of the lattice dynamics of the canonical CDW compound 2H-TaSe2 complemented by angle-resolved photoemission spectroscopy and density functional perturbation theory. Our results rule out the formation of a central-peak without full phonon softening for the CDW transition in 2H-TaSe2 and provide evidence for a novel precursor region above the CDW transition temperature TCDW, which is characterized by an overdamped phonon mode and not detectable in our photoemission experiments. Thus, 2H-TaSe2 exhibits structural before electronic static order and emphasizes the important lattice contribution to CDW transitions. Our ab-initio calculations explain the interplay of electron-phonon coupling and Fermi surface topology triggering the CDW phase transition and predict that the CDW soft phonon mode promotes emergent superconductivity near the pressure-driven CDW quantum critical point. data are stored in an project of origin lab format application/x-tar