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Synthesis of clathrate cerium superhydride CeH9 at 80-100 GPa with atomic hydrogen sublattice
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Synthesis of clathrate cerium superhydride CeH9 at 80-100 GPa with atomic hydrogen sublattice
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Journal Article
Synthesis of clathrate cerium superhydride CeH9 at 80-100 GPa with atomic hydrogen sublattice
2019
Overview
Hydrogen-rich superhydrides are believed to be very promising high-
T
c
superconductors. Recent experiments discovered superhydrides at very high pressures, e.g. FeH
5
at 130 GPa and LaH
10
at 170 GPa. With the motivation of discovering new hydrogen-rich high-
T
c
superconductors at lowest possible pressure, here we report the prediction and experimental synthesis of cerium superhydride CeH
9
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 CeH
9
. CeH
9
crystallizes in a
P6
3
/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 CeH
9
provides a practical platform to further investigate and understand conventional superconductivity in hydrogen rich superhydrides.
Hydrogen-rich superhydrides are promising high-temperature superconductors which have been observed only at pressures above 170 GPa. Here the authors show that CeH
9
can be synthesized at 80-100 GPa with laser heating, and is characterized by a clathrate structure with a dense 3-dimensional atomic hydrogen sublattice.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
