Hot Hydride Superconductivity Above 550 K
Hot Hydride Superconductivity Above 550 K
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DOI：
10.3389/femat.2022.837651
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
A. Grockowiak;M. Ahart;T. Helm;G. Garbarino;K. Glazyrin;W. Coniglio;Ravhi S Kumar;M. Somayazulu-M.-Somayaz
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文献类型：
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作者：
A. Grockowiak;M. Ahart;T. Helm;G. Garbarino;K. Glazyrin;W. Coniglio;Ravhi S Kumar;M. Somayazulu-M.-Somayaz
在过去的几年里，对室温超导性的研究加速了，这是由于实验上可行的理论预测表明，在高温高压下，将致密氢与其他元素合金化可以产生传统的超导性。这些预测为简单二元氢化物的合成提供了信息，最终发现了超导转变温度为260 K， 180 GPa的超氢化物LaH10。我们现在成功地合成了一种初始温度为294k的金属la基超氢化物。当受到随后的热漂移，促进化学反应到更高阶系统时，温度开始不可逆地被驱动到556 K。x射线表征证实形成了一个扭曲的基于LaH10的骨架，这表明在La和/或H位点上形成了取代的三元或四元化合物。结果为热超导性提供了证据，与最近对高压下高阶氢化物的预测一致。
The search for room temperature superconductivity has accelerated in the last few years driven by experimentally accessible theoretical predictions that indicated alloying dense hydrogen with other elements could produce conventional superconductivity at high temperatures and pressures. These predictions helped inform the synthesis of simple binary hydrides that culminated in the discovery of the superhydride LaH10 with a superconducting transition temperature T c of 260 K at 180 GPa. We have now successfully synthesized a metallic La-based superhydride with an initial T c of 294 K. When subjected to subsequent thermal excursions that promoted a chemical reaction to a higher order system, the T c onset was driven irreversibly to 556 K. X-ray characterization confirmed the formation of a distorted LaH10 based backbone that suggests the formation of ternary or quaternary compounds with substitution at the La and/or H sites. The results provide evidence for hot superconductivity, aligning with recent predictions for higher order hydrides under pressure.