Synthesis of clathrate cerium superhydride CeH9 at 80-100 GPa with atomic hydrogen sublattice
Synthesis of clathrate cerium superhydride CeH9 at 80-100 GPa with atomic hydrogen sublattice
复制标题
80-100 GPa 原子氢亚晶格合成笼形超氢化铈 CeH9
DOI：
10.1038/s41467-019-12326-y
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发表时间：
2019-10-01
影响因子：
16.6
通讯作者：
Lin, Jung-Fu
中科院分区：
文献类型：
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作者：
Salke, Nilesh P.;Esfahani, M. Mahdi Davari;Lin, Jung-Fu
富氢超导体被认为是非常有前途的高温超导体。最近的实验发现超临界流体在非常高的压力下，例如FeH 5在130 GPa和LaH 10在170 GPa。为了在尽可能低的压力下发现新的富氢高温超导体，本文报道了在80-100 GPa压力下，在激光加热金刚石对顶砧装置上结合同步辐射X射线衍射技术合成铈超氢化物CeH_9的实验结果。进行从头计算以评估Ce-H系统的详细化学性质，并了解CeH 9的结构、稳定性和超导电性。CeH 9在100 GPa下以P6（3）/mmc笼形结构结晶，具有非常致密的三维原子氢亚晶格。这些发现为在可行的压力范围内寻找与原子氢非常相似的超导体提供了重要的线索。超氢化物CeH 9的发现为进一步研究和理解富氢超导体中的常规超导性提供了一个实用的平台。
Hydrogen-rich superhydrides are believed to be very promising high-T-c 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-T-c 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 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 CeH9 provides a practical platform to further investigate and understand conventional superconductivity in hydrogen rich superhydrides.