Superconductivity above 200 K discovered in superhydrides of calcium

Li, Zhiwen; He, Xin; Zhang, Changling; Wang, Xiancheng; Zhang, Sijia; Jia, Yating; Feng, Shaomin; Lu, Ke; Zhao, Jianfa; Zhang, Jun; Min, Baosen; Long, Youwen; Yu, Richeng; Wang, Luhong; Ye, Meiyan; Zhang, Zhanshuo; Prakapenka, Vitali; Chariton, Stella; Ginsberg, Paul A.; Bass, Jay; Yuan, Shuhua; Liu, Haozhe; Jin, Changqing

doi:10.1038/s41467-022-30454-w

Title: Superconductivity above 200 K discovered in superhydrides of calcium

Journal Article · 22 May 2022 · Nature Communications

DOI: https://doi.org/10.1038/s41467-022-30454-w · OSTI ID:1869975

Li, Zhiwen ^[1]; He, Xin ^[2]; Zhang, Changling ^[1];

^[1]; Zhang, Sijia ^[3]; Jia, Yating ^[3]; Feng, Shaomin ^[3]; Lu, Ke ^[1]; Zhao, Jianfa ^[1];

^[1]; Min, Baosen ^[1];

^[2]; Yu, Richeng ^[1]; Wang, Luhong ^[4]; Ye, Meiyan ^[5]; Zhang, Zhanshuo ^[5]; Prakapenka, Vitali ^[6]; Chariton, Stella ^[6]; Ginsberg, Paul A. ^[7]; Bass, Jay ^[7] more »

Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Laboratory, Guangdong (China)
Chinese Academy of Sciences (CAS), Beijing (China)
Harbin Institute of Technology (China)
Jilin Univ., Changchun (China)
Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
Univ. of Illinois at Urbana-Champaign, IL (United States)
Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing (China)

Searching for superconductivity with T_c 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 (T_c) 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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357; FG02-94ER14466

OSTI ID:: 1869975

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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