%0 Journal Article
%A Tymoshenko, Yuliia
%A Haghighirad, Amir-Abbas
%A Heid, Rolf
%A Lacmann, Tom
%A Ivashko, Alsu
%A Merritt, Adrian
%A Shen, Xingchen
%A Merz, Michael
%A Garbarino, Gaston
%A Paolasini, Luigi
%A Bosak, Alexei
%A Diekmann, Florian K.
%A Rossnagel, Kai
%A Rosenkranz, Stephan
%A Said, Ayman H.
%A Weber, Frank
%T Charge-density-wave quantum critical point under pressure in 2H-TaSe<sub>2</sub>
%J Communications Physics
%V 8
%N 1
%@ 2399-3650
%C London
%I Springer Nature
%M PUBDB-2026-00459
%P 352
%D 2025
%X The presence of a quantum-critical point (QCP) at which a nearby ordered phase is suppressed to zero temperature is often invoked to explain emergent quantum phases, e.g. superconductivity. Yet, identifying a QCP and establishing its correlation with superconductivity remains challenging. Materials featuring charge-density-wave (CDW) order and superconductivity offer a clear scenario as both states can be associated with electron-phonon coupling. Here, we uncover a CDW-QCP and demonstrate its interrelation with superconductivity in the prototypical transition-metal dichalcogenide 2H-TaSe<sub>2</sub>. We determine the evolution of the CDW state up to and beyond its suppression at the critical pressure p<sub>c</sub> = 19.9(1) GPa by means of X-ray diffraction and inelastic X-ray scattering measurements providing a full crystallographic refinement of the commensurate CDW superstructure. The pressure-induced CDW-QCP in close vicinity to the maximum superconducting transition temperature. Ab-initio lattice dynamical calculations corroborate that 2H-TaSe<sub>2</sub> features order-parameter fluctuation enhanced superconductivity and can serve as a paradigm to investigate superconductivity near a CDW-QCP.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1038/s42005-025-02254-3
%U https://bib-pubdb1.desy.de/record/644916