Synthesis of clathrate cerium superhydride CeH9 at 80-100 GPa with atomic hydrogen sublattice

Nilesh P. Salke, M. Mahdi Davari Esfahani, Youjun Zhang, Ivan A. Kruglov, Jianshi Zhou, Yaguo Wang, Eran Greenberg, Vitali B. Prakapenka, Jin Liu, Artem R. Oganov () and Jung-Fu Lin ()
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Nilesh P. Salke: Center for High Pressure Science & Technology Advanced Research (HPSTAR)
M. Mahdi Davari Esfahani: State University of New York, Stony Brook
Youjun Zhang: Sichuan University
Ivan A. Kruglov: Moscow Institute of Physics and Technology
Jianshi Zhou: The University of Texas at Austin
Yaguo Wang: The University of Texas at Austin
Eran Greenberg: University of Chicago
Vitali B. Prakapenka: University of Chicago
Jin Liu: Center for High Pressure Science & Technology Advanced Research (HPSTAR)
Artem R. Oganov: Moscow Institute of Physics and Technology
Jung-Fu Lin: The University of Texas at Austin

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Hydrogen-rich superhydrides are believed to be very promising high-Tc superconductors. Recent experiments discovered superhydrides at very high pressures, e.g. FeH5 at 130 GPa and LaH10 at 170 GPa. With the motivation of discovering new hydrogen-rich high-Tc superconductors at lowest possible pressure, here we report the prediction and experimental synthesis of cerium superhydride CeH9 at 80–100 GPa in the laser-heated diamond anvil cell coupled with synchrotron X-ray diffraction. Ab initio calculations were carried out to evaluate the detailed chemistry of the Ce-H system and to understand the structure, stability and superconductivity of CeH9. CeH9 crystallizes in a P63/mmc clathrate structure with a very dense 3-dimensional atomic hydrogen sublattice at 100 GPa. These findings shed a significant light on the search for superhydrides in close similarity with atomic hydrogen within a feasible pressure range. Discovery of superhydride CeH9 provides a practical platform to further investigate and understand conventional superconductivity in hydrogen rich superhydrides.

Date: 2019
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DOI: 10.1038/s41467-019-12326-y

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