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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Creating superconductivity in WB2 through pressure-induced metastable planar defects.

J Lim1, A C Hire2,3, Y Quan1,2,3

  • 1Department of Physics, University of Florida, Gainesville, FL, 32611, USA.

Nature Communications
|December 22, 2022
PubMed
Summary
This summary is machine-generated.

Mechanical deformation of ultra-hard WB2 under high pressure induces superconductivity. This discovery opens new avenues for designing novel superconducting materials by creating specific structural defects.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Superconductivity

Background:

  • Ultra-hard materials like WB2 are typically not superconducting.
  • Understanding pressure-induced phenomena in solids is crucial for materials discovery.

Purpose of the Study:

  • To investigate the high-pressure behavior of WB2.
  • To explore the induction of superconductivity in WB2 through mechanical deformation.

Main Methods:

  • High-pressure electrical resistivity measurements up to 187 GPa.
  • Synchrotron X-ray diffraction up to 145 GPa.
  • Theoretical calculations (electron-phonon coupling).

Main Results:

  • Superconductivity observed above 50 GPa, with Tc reaching 17 K at 91 GPa.
  • Tc decreases with further compression to 187 GPa.
  • Mechanically induced stacking faults and twin boundaries, resembling MgB2, are responsible for superconductivity.

Conclusions:

  • Superconductivity in WB2 is mechanically induced by defects, not a bulk structural transition.
  • This work presents a new strategy for designing superconducting materials via mechanical deformation.
  • The formation of metastable stacking faults is key to pressure-induced superconductivity.