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Creating superconductivity in WB2 through pressure-induced metastable planar defects

Author

Listed:
  • J. Lim

    (University of Florida)

  • A. C. Hire

    (University of Florida
    University of Florida)

  • Y. Quan

    (University of Florida
    University of Florida
    University of Florida)

  • J. S. Kim

    (University of Florida)

  • S. R. Xie

    (University of Florida
    University of Florida)

  • S. Sinha

    (University of Florida)

  • R. S. Kumar

    (University of Illinois Chicago)

  • D. Popov

    (Argonne National Laboratory)

  • C. Park

    (Argonne National Laboratory)

  • R. J. Hemley

    (University of Illinois Chicago)

  • Y. K. Vohra

    (University of Alabama at Birmingham)

  • J. J. Hamlin

    (University of Florida)

  • R. G. Hennig

    (University of Florida
    University of Florida)

  • P. J. Hirschfeld

    (University of Florida)

  • G. R. Stewart

    (University of Florida)

Abstract

High-pressure electrical resistivity measurements reveal that the mechanical deformation of ultra-hard WB2 during compression induces superconductivity above 50 GPa with a maximum superconducting critical temperature, Tcof 17 K at 91 GPa. Upon further compression up to 187 GPa, the Tcgradually decreases. Theoretical calculations show that electron-phonon mediated superconductivity originates from the formation of metastable stacking faults and twin boundaries that exhibit a local structure resembling MgB2 (hP3, space group 191, prototype AlB2). Synchrotron x-ray diffraction measurements up to 145 GPa show that the ambient pressure hP12 structure (space group 194, prototype WB2) continues to persist to this pressure, consistent with the formation of the planar defects above 50 GPa. The abrupt appearance of superconductivity under pressure does not coincide with a structural transition but instead with the formation and percolation of mechanically-induced stacking faults and twin boundaries. The results identify an alternate route for designing superconducting materials.

Suggested Citation

  • J. Lim & A. C. Hire & Y. Quan & J. S. Kim & S. R. Xie & S. Sinha & R. S. Kumar & D. Popov & C. Park & R. J. Hemley & Y. K. Vohra & J. J. Hamlin & R. G. Hennig & P. J. Hirschfeld & G. R. Stewart, 2022. "Creating superconductivity in WB2 through pressure-induced metastable planar defects," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-35191-8
    DOI: 10.1038/s41467-022-35191-8
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    References listed on IDEAS

    as
    1. A. P. Drozdov & M. I. Eremets & I. A. Troyan & V. Ksenofontov & S. I. Shylin, 2015. "Conventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system," Nature, Nature, vol. 525(7567), pages 73-76, September.
    2. Takahiro Matsuoka & Katsuya Shimizu, 2009. "Direct observation of a pressure-induced metal-to-semiconductor transition in lithium," Nature, Nature, vol. 458(7235), pages 186-189, March.
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