在温和压力下通过Th和Ce元素稳定了三极超导化物
Qiwen Jiang1, Zihan Zhang1, Hao Song2
1State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
Fundamental research
|June 27, 2024
概括
研究人员探索了新的三元化物ThBeH8和CeBeH8,在环境压力附近稳定了超导性. 这些材料表现出高临界温度,为实际的超导体应用提供了潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 计算化学计算化学
背景情况:
- 像H3S和LaH10这样的高压化物显示出高超导的临界温度 (Tc).
- 它们的应用受到极高压力 (150GPa以上) 的限制.
- 在环境压力附近实现室温超导仍然是一个重大挑战.
研究的目的:
- 通过计算设计新的三元化物.
- 为了稳定化 (Be-H) 的超导相在环境压力附近.
- 调查重金属 (Th,Ce) 在压缩前的潜力.
主要方法:
- 使用重金属 (Th) 和 (Ce) 的化学"预压缩"Be-H系统的理论计算.
- 预测热力学稳定性和超导性能.
- 解决异构的米格达尔-埃利亚什伯格方程以确定临界温度 (Tc).
主要成果:
- 在高压下预测ThBeH8和CeBeH8的稳定化物型结构 (分别为69GPa和76GPa).
- 在近环境压力下,ThBeH8的计算Tc为113K,CeBeH8的计算Tc为28K (分别为7GPa和13GPa).
- 确定Be-H振动在电子声波合和结构稳定中的关键作用.
结论:
- ThBeH8和CeBeH8是显著降低压力的高温超导体的有希望的候选者.
- 使用重金属的"预压缩"策略有效地稳定了超导.
- 这些发现为在较温和条件下实验合成三元化物超导体提供了指导.
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