Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe2
Journal Article
·
· Nature Communications
- Karlsruhe Inst. of Technology (KIT) (Germany). Institute for Quantum Materials and Technologies; Chongqing Univ. (China)
- Karlsruhe Inst. of Technology (KIT) (Germany). Institute for Quantum Materials and Technologies
- University of Fribourg (Switzerland). Fribourg Center for Nanomaterials
- University of Fribourg (Switzerland). Fribourg Center for Nanomaterials; Univ. of Sao Paulo (Brazil)
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Univ. of Kiel (Germany)
- Univ. of Kiel (Germany); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- Sao Paulo Research Foundation (FAPESP); Swiss National Science Foundation (SNSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 2345193
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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