期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 144, 期 29, 页码 13394-13400出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c05834
关键词
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资金
- National Key Research and Development Program of China [2021YFA1400203]
- Major Program of the National Natural Science Foundation of China [52090024]
- National Natural Science Foundation of China [12074138]
- Jilin Province Science and Technology Development Program [YDZJ202102CXJD016]
- Program for Jilin University Science and Technology Innovative Research Team
- Program for Jilin University Computational Interdisciplinary Innovative Platform
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB33000000]
- National Science Foundation [DMR-210488]
This study reports the discovery of a new class of extremely hydrogen-rich clathrate superhydride MH18 with a predicted critical superconducting temperature (Tc) up to 330 K, well above room temperature. The bonding and electronic properties of these superhydrides closely resemble atomic metallic hydrogen, and they represent the highest Tc found in a thermodynamically stable hydride compound.
Achieving room-temperature superconductivity has been an enduring scientific pursuit driven by broad fundamental interest and enticing potential applications. The recent discovery of high-pressure clathrate superhydride LaH10 with superconducting critical temperatures (T-c) of 250-260 K made it tantalizingly close to realizing this long-sought goal. Here, we report a remarkable finding based on an advanced crystal structure search method of a new class of extremely hydrogen-rich clathrate superhydride MH18 (M: rare-earth/actinide atom) stoichiometric compounds stabilized at an experimentally accessible pressure of 350 GPa. These compounds are predicted to host T-c up to 330 K, which is well above room temperature. The bonding and electronic properties of these MH is clathrate superhydrides closely resemble those of atomic metallic hydrogen, giving rise to the highest T-c hitherto found in a thermodynamically stable hydride compound. An in- depth study of these extreme superhydrides offers insights for elucidating phonon-mediated superconductivity above room temperature in hydrogen-rich and other low-Z materials.
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