articlePhysical Review LettersApr 20, 2022LVBRONZE OA

High-Temperature Superconducting Phase in Clathrate Calcium Hydride CaH 6 up to 215 K at a Pressure of 172 GPa

LMLiang MaKWKui WangYXYu XieXYXin YangYWYingying Wang

Jilin University · Jilin International Studies University · +4 more institutions

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Abstract

The recent discovery of superconductive rare earth and actinide superhydrides has ushered in a new era of superconductivity research at high pressures. This distinct type of clathrate metal hydrides was first proposed for alkaline-earth-metal hydride CaH_{6} that, however, has long eluded experimental synthesis, impeding an understanding of pertinent physics. Here, we report successful synthesis of CaH_{6} and its measured superconducting critical temperature T_{c} of 215 K at 172 GPa, which is evidenced by a sharp drop of resistivity to zero and a characteristic decrease of T_{c} under a magnetic field up to 9 T. An estimate based on the Werthamer-Helfand-Hohenberg model gives a giant zero-temperature upper…

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425
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Authors

12
  • LM
    Liang MaCorresponding

    Jilin University, Jilin International Studies University, State Key Laboratory of Superhard Materials

  • KW
    Kui Wang

    Jilin University, State Key Laboratory of Superhard Materials

  • YX
    Yu Xie

    Jilin University, State Key Laboratory of Superhard Materials

  • XY
    Xin Yang

    Jilin University, State Key Laboratory of Superhard Materials

  • YW
    Yingying Wang

    Jilin University, State Key Laboratory of Superhard Materials

Topics & keywords

Topics
Keywords
  • Superconductivity
  • Hydride
  • Clathrate hydrate
  • Actinide
  • Electrical resistivity and conductivity
  • Phase (matter)
  • Rare earth
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