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Emergence of coherence in the charge-density wave state of 2H-NbSe2

Author

Listed:
  • U. Chatterjee

    (Argonne National Laboratory
    University of Virginia)

  • J. Zhao

    (University of Virginia
    University of Illinois at Chicago)

  • M. Iavarone

    (Temple University)

  • R. Di Capua

    (Temple University)

  • J. P. Castellan

    (Argonne National Laboratory
    Institute of Solid State Physics, Karlsruhe Institute of Technology)

  • G. Karapetrov

    (Drexel University)

  • C. D. Malliakas

    (Argonne National Laboratory
    Northwestern University)

  • M. G. Kanatzidis

    (Argonne National Laboratory
    Northwestern University)

  • H. Claus

    (Argonne National Laboratory)

  • J. P. C. Ruff

    (Advanced Photon Source, Argonne National Laboratory
    CHESS, Cornell University)

  • F. Weber

    (Argonne National Laboratory
    Institute of Solid State Physics, Karlsruhe Institute of Technology)

  • J. van Wezel

    (Argonne National Laboratory
    Institute for Theoretical Physics, University of Amsterdam)

  • J. C. Campuzano

    (Argonne National Laboratory
    University of Illinois at Chicago)

  • R. Osborn

    (Argonne National Laboratory)

  • M. Randeria

    (Ohio State University)

  • N. Trivedi

    (Ohio State University)

  • M. R. Norman

    (Argonne National Laboratory)

  • S. Rosenkranz

    (Argonne National Laboratory)

Abstract

A charge-density wave (CDW) state has a broken symmetry described by a complex order parameter with an amplitude and a phase. The conventional view, based on clean, weak-coupling systems, is that a finite amplitude and long-range phase coherence set in simultaneously at the CDW transition temperature Tcdw. Here we investigate, using photoemission, X-ray scattering and scanning tunnelling microscopy, the canonical CDW compound 2H-NbSe2 intercalated with Mn and Co, and show that the conventional view is untenable. We find that, either at high temperature or at large intercalation, CDW order becomes short-ranged with a well-defined amplitude, which has impacts on the electronic dispersion, giving rise to an energy gap. The phase transition at Tcdw marks the onset of long-range order with global phase coherence, leading to sharp electronic excitations. Our observations emphasize the importance of phase fluctuations in strongly coupled CDW systems and provide insights into the significance of phase incoherence in ‘pseudogap’ states.

Suggested Citation

  • U. Chatterjee & J. Zhao & M. Iavarone & R. Di Capua & J. P. Castellan & G. Karapetrov & C. D. Malliakas & M. G. Kanatzidis & H. Claus & J. P. C. Ruff & F. Weber & J. van Wezel & J. C. Campuzano & R. O, 2015. "Emergence of coherence in the charge-density wave state of 2H-NbSe2," Nature Communications, Nature, vol. 6(1), pages 1-7, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7313
    DOI: 10.1038/ncomms7313
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    Cited by:

    1. 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.
    2. Hongguang Wang & Jiawei Zhang & Chen Shen & Chao Yang & Kathrin Küster & Julia Deuschle & Ulrich Starke & Hongbin Zhang & Masahiko Isobe & Dennis Huang & Peter A. van Aken & Hidenori Takagi, 2024. "Direct visualization of stacking-selective self-intercalation in epitaxial Nb1+xSe2 films," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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