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- Title
Superconductivity above 200 K discovered in superhydrides of calcium.
- Authors
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
- 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. The discovery of superconductivity in hydrides at critical temperature (Tc) near room temperature receives intensive attentions. Here the authors report experimental synthesis and discovery of superconductivity with Tc above 210 K in calcium superhydrides at 160–190 GPa.
- Subjects
SUPERCONDUCTIVITY; ELECTRIC admittance measurement; MAGNETIC field measurements; CALCIUM; DIAMOND anvil cell; HYDRIDES; CALCIUM ions
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-30454-w