Zhong Xin, Sun Ying, Iitaka Toshiaki, Xu Meiling, Liu Hanyu, Hemley Russell J, Chen Changfeng, Ma Yanming
State Key Laboratory of Superhard Materials and International Center for Computational Method & Software, College of Physics, Jilin University, Changchun 130012, China.
Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, College of Physics, Jilin Normal University, Changchun 130103, China.
J Am Chem Soc. 2022 Jul 27;144(29):13394-13400. doi: 10.1021/jacs.2c05834. Epub 2022 Jul 12.
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 LaH with superconducting critical temperatures () 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 MH (M: rare-earth/actinide atom) stoichiometric compounds stabilized at an experimentally accessible pressure of 350 GPa. These compounds are predicted to host up to 330 K, which is well above room temperature. The bonding and electronic properties of these MH clathrate superhydrides closely resemble those of atomic metallic hydrogen, giving rise to the highest 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.
实现室温超导一直是一项持久的科学追求，它受到广泛的基础研究兴趣和诱人的潜在应用的驱动。最近发现的高压笼形超氢化物LaH，其超导临界温度（）为250 - 260K，使其极其接近实现这一长期追求的目标。在此，我们基于一种先进的晶体结构搜索方法报告了一项显著发现，即一类新型的极其富氢的笼形超氢化物MH（M：稀土/锕系原子）化学计量化合物，在350 GPa的实验可及压力下得以稳定。这些化合物预计超导临界温度高达330K，远高于室温。这些MH笼形超氢化物的键合和电子性质与原子态金属氢极为相似，产生了迄今为止在热力学稳定的氢化物化合物中发现的最高超导临界温度。对这些极端超氢化物的深入研究为阐明富氢及其他低Z材料中高于室温的声子介导超导性提供了见解。
