Superconductivity above 200 K discovered in superhydrides of calcium

Zhiwen Li, Xin He, Changling Zhang, Xiancheng Wang (), Sijia Zhang, Yating Jia, Shaomin Feng, Ke Lu, Jianfa Zhao, Jun Zhang, Baosen Min, Youwen Long, Richeng Yu, Luhong Wang, Meiyan Ye, Zhanshuo Zhang, Vitali Prakapenka, Stella Chariton, Paul A. Ginsberg, Jay Bass, Shuhua Yuan, Haozhe Liu and Changqing Jin ()
Additional contact information
Zhiwen Li: Chinese Academy of Sciences
Xin He: Chinese Academy of Sciences
Changling Zhang: Chinese Academy of Sciences
Xiancheng Wang: Chinese Academy of Sciences
Sijia Zhang: Chinese Academy of Sciences
Yating Jia: Chinese Academy of Sciences
Shaomin Feng: Chinese Academy of Sciences
Ke Lu: Chinese Academy of Sciences
Jianfa Zhao: Chinese Academy of Sciences
Jun Zhang: Chinese Academy of Sciences
Baosen Min: Chinese Academy of Sciences
Youwen Long: Chinese Academy of Sciences
Richeng Yu: Chinese Academy of Sciences
Luhong Wang: Harbin Institute of Technology
Meiyan Ye: Jilin University
Zhanshuo Zhang: Jilin University
Vitali Prakapenka: University of Chicago
Stella Chariton: University of Chicago
Paul A. Ginsberg: University of Illinois at Urbana-Champaign
Jay Bass: University of Illinois at Urbana-Champaign
Shuhua Yuan: Center for High Pressure Science & Technology Advanced Research
Haozhe Liu: Center for High Pressure Science & Technology Advanced Research
Changqing Jin: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-5

Abstract: Abstract Searching for superconductivity with Tc near room temperature is of great interest both for fundamental science & many potential applications. Here we report the experimental discovery of superconductivity with maximum critical temperature (Tc) above 210 K in calcium superhydrides, the new alkali earth hydrides experimentally showing superconductivity above 200 K in addition to sulfur hydride & rare-earth hydride system. The materials are synthesized at the synergetic conditions of 160~190 GPa and ~2000 K using diamond anvil cell combined with in-situ laser heating technique. The superconductivity was studied through in-situ high pressure electric conductance measurements in an applied magnetic field for the sample quenched from high temperature while maintained at high pressures. The upper critical field Hc(0) was estimated to be ~268 T while the GL coherent length is ~11 Å. The in-situ synchrotron X-ray diffraction measurements suggest that the synthesized calcium hydrides are primarily composed of CaH6 while there may also exist other calcium hydrides with different hydrogen contents.

Date: 2022
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DOI: 10.1038/s41467-022-30454-w

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