Prediction of Above-Room-Temperature Superconductivity in Lanthanide/Actinide Extreme Superhydrides,Journal of the American Chemical Society

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Prediction of Above-Room-Temperature Superconductivity in Lanthanide/Actinide Extreme Superhydrides
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2022-07-12 , DOI: 10.1021/jacs.2c05834
Xin Zhong _{1,

2} , Ying Sun ₁ , Toshiaki Iitaka ₃ , Meiling Xu ₄ , Hanyu Liu _{1,

5} , Russell J Hemley ₆ , Changfeng Chen ₇ , Yanming Ma _{1,

5}

Affiliation

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 MH₁₈ 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.

中文翻译：

镧系/锕系极端超氢化物室温以上超导性的预测

在广泛的基础兴趣和诱人的潜在应用的推动下，实现室温超导一直是一项持久的科学追求。最近发现的超导临界温度 ( T _c ) 为 250-260 K的高压笼形超氢化物 LaH ₁₀使其非常接近实现这一长期追求的目标。在这里，我们报告了一项基于先进晶体结构搜索方法的显着发现，该方法是一种新型的极富氢笼形超氢化物 MH ₁₈（M：稀土/锕系原子）化学计量化合物，其在实验可达到的 350 GPa 压力下稳定。预计这些化合物会承载T _c高达 330 K，远高于室温。这些 MH ₁₈笼形超氢化物的键合和电子特性与原子金属氢非常相似，从而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T _{c 。}对这些极端超氢化物的深入研究为阐明富氢材料和其他低 Z 材料中高于室温的声子介导的超导性提供了见解。

更新日期：2022-07-12

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