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

Author

Listed:
  • Xingchen Shen

    (Karlsruhe Institute of Technology
    Chongqing University)

  • Rolf Heid

    (Karlsruhe Institute of Technology)

  • Roland Hott

    (Karlsruhe Institute of Technology)

  • Amir-Abbas Haghighirad

    (Karlsruhe Institute of Technology)

  • Björn Salzmann

    (Université de Fribourg)

  • Marli Reis Cantarino

    (Université de Fribourg
    Universidade de São Paulo, São Paulo)

  • Claude Monney

    (Université de Fribourg)

  • Ayman H. Said

    (Argonne National Laboratory)

  • Mehdi Frachet

    (Karlsruhe Institute of Technology)

  • Bridget Murphy

    (Kiel University
    Kiel University)

  • Kai Rossnagel

    (Kiel University
    Kiel University
    Deutsches Elektronen-Synchrotron DESY)

  • Stephan Rosenkranz

    (Argonne National Laboratory)

  • Frank Weber

    (Karlsruhe Institute of Technology)

Abstract

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.

Suggested Citation

  • Xingchen Shen & Rolf Heid & Roland Hott & Amir-Abbas Haghighirad & Björn Salzmann & Marli Reis Cantarino & Claude Monney & Ayman H. Said & Mehdi Frachet & Bridget Murphy & Kai Rossnagel & Stephan Rose, 2023. "Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe2," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43094-5
    DOI: 10.1038/s41467-023-43094-5
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    References listed on IDEAS

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