Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe2

Shen, Xingchen; Heid, Rolf; Hott, Roland; Haghighirad, Amir-Abbas; Salzmann, Björn; dos Reis Cantarino, Marli; Monney, Claude; Said, Ayman H.; Frachet, Mehdi; Murphy, Bridget; Rossnagel, Kai; Rosenkranz, Stephan; Weber, Frank

doi:10.1038/s41467-023-43094-5

Title: Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe₂

Journal Article · 09 November 2023 · Nature Communications

DOI: https://doi.org/10.1038/s41467-023-43094-5 · OSTI ID:2345193

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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 T_CDW, 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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); Swiss National Science Foundation (SNSF); Sao Paulo Research Foundation (FAPESP); 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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Title: Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe₂