Creating superconductivity in WB 2 through pressure-induced metastable planar defects.

Autor: Lim J; Department of Physics, University of Florida, Gainesville, FL, 32611, USA., Hire AC; Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611, USA.; Quantum Theory Project, University of Florida, Gainesville, FL, 32611, USA., Quan Y; Department of Physics, University of Florida, Gainesville, FL, 32611, USA.; Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611, USA.; Quantum Theory Project, University of Florida, Gainesville, FL, 32611, USA., Kim JS; Department of Physics, University of Florida, Gainesville, FL, 32611, USA., Xie SR; Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611, USA.; Quantum Theory Project, University of Florida, Gainesville, FL, 32611, USA., Sinha S; Department of Physics, University of Florida, Gainesville, FL, 32611, USA., Kumar RS; Department of Physics, Chemistry, and Earth and Environmental Sciences, University of Illinois Chicago, Chicago, IL, 60607, USA., Popov D; HPCAT, X-ray Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA., Park C; HPCAT, X-ray Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA., Hemley RJ; Department of Physics, Chemistry, and Earth and Environmental Sciences, University of Illinois Chicago, Chicago, IL, 60607, USA., Vohra YK; Department of Physics, University of Alabama at Birmingham, Birmingham, AL, 35294, USA., Hamlin JJ; Department of Physics, University of Florida, Gainesville, FL, 32611, USA. jhamlin@ufl.edu., Hennig RG; Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611, USA.; Quantum Theory Project, University of Florida, Gainesville, FL, 32611, USA., Hirschfeld PJ; Department of Physics, University of Florida, Gainesville, FL, 32611, USA., Stewart GR; Department of Physics, University of Florida, Gainesville, FL, 32611, USA.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2022 Dec 22; Vol. 13 (1), pp. 7901. Date of Electronic Publication: 2022 Dec 22.
DOI: 10.1038/s41467-022-35191-8
Abstrakt: 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.
(© 2022. The Author(s).)
Databáze: MEDLINE
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