Novel Synthesis Route and Observation of Superconductivity in the Se-H System at Extreme Conditions

ORAL

Abstract

The recent observation of highest Tc ~ 203 K in the S-H system at high pressure by Drozdov et al. have inspired several theoretical studies for superhydrides with higher predicted Tc values. However there is scarcity of experimental observation of Tc in synthesized higher hydrides so far. We have chosen a novel route to synthesize higher hydride of Se, the closest analog of sulfur, using solid media and laser heating at pressure close to ~ 10 GPa. The synthesis of hydrogen rich van der Waals compound (H2Se)2H2 is confirmed using in-situ Raman spectroscopy. The synthesized compound shows metallic behavior on compression and superconducting transition temperature ~ 105 K has been observed using four probe technique at ~135 GPa.

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Presenters

  • Ajay Mishra

    • Geophysical Laboratory, Carnegie Institution of Washington
    • Geophysical Laboratory, Carnegie Inst of Washington
    • Carnegie Inst of Washington

Authors

  • Ajay Mishra

    • Geophysical Laboratory, Carnegie Institution of Washington
    • Geophysical Laboratory, Carnegie Inst of Washington
    • Carnegie Inst of Washington

  • Maddury Somayazulu

    • Geophysical Laboratory, Carnegie Institution of Washington
    • Geophysical Laboratory, Carnegie Inst of Washington
    • Carnegie Inst of Washington

  • Muhtar Ahart

    • Geophysical Laboratory, Carnegie Institution of Washington
    • Carnegie Inst of Washington
    • Extreme Materials Initiative, Geophysical Lab, Carnegie Institution for Science

  • Amol Karandikar

    • Carnegie Inst of Washington

  • Russell Hemley

    • Institute of Materials Science and Civil and Environmental Engineering, George Washington University
    • School of Engineering and Applied Science, George Washington University
    • George Washington University
    • Department of Civil and Environmental Engineering, The George Washington University

  • Viktor Struzhkin

    • Carnegie Inst of Washington
    • Geophysical Laboratory, CIW