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Lim, J.; Hire, A. C.; Quan, Y.; Kim, J. S.; Xie, S. R.; Sinha, S.; Kumar, R. S.; Popov, D.; Park, C.; Hemley, R. J.; Vohra, Y. K.; Hamlin, J. J.; Hennig, R. G.; Hirschfeld, P. J.; Stewart, G. R.
Nature communications, 12/2022, Letnik: 13, Številka: 1Journal Article
Abstract High-pressure electrical resistivity measurements reveal that the mechanical deformation of ultra-hard WB 2 during compression induces superconductivity above 50 GPa with a maximum superconducting critical temperature, T c of 17 K at 91 GPa. Upon further compression up to 187 GPa, the T c gradually 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 MgB 2 (hP3, space group 191, prototype AlB 2 ). Synchrotron x-ray diffraction measurements up to 145 GPa show that the ambient pressure hP12 structure (space group 194, prototype WB 2 ) 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.
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in: SICRIS
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