论文标题
sodalite类似clathrate的实验合成euh $ _6 $和euh $ _9 $在极端压力下
Experimental Syntheses of Sodalite-like Clathrate EuH$_6$ and EuH$_9$ at Extreme Pressures
论文作者
论文摘要
最近发现了极端压力的一类类似硫酸盐状的超水（例如，YH6，YH9，THH9，THH10和LAH10），在LAH10的最高TC接近260 K的最高TC中，LAH10的最高TC搜索了一个新的时代，它在高温下搜索了一个新的时代，在高温时代搜索了高质量超级超级超级超级超级超级超级超级consefters，它通常表现出高度的高温超导性。人们对发现替代的杂质超水的兴趣很大，这些杂物可能会见证长期以上的室温超导性。在这里，我们旨在实现强相关的欧洲（EU）超级氢化物的实验综合，其中理论可能无法预测超导性。我们在钻石砧细胞中加压和激光热并在152 GPA和1,700 K，以及170 GPA和2,800 k的条件下，在钻石砧上加压金属和氨基硼烷（NH3BH3）（NH3BH3），并成功合成了类似Sodalite的Clathrate EUH6和EUH9。还合成了lanthanide超水中未报告的EUH5和EUH6的两个非静态结构阶段。计算出的较大的H源性电子密度在FERMI水平的lathrate EUH6中意味着高温超导性的潜力。我们的工作创建了一个模型的超水平平台，以随后研究电子结构中强烈相关的效应如何影响超水的超导性，这是迄今为止尚不清楚的现象。
The recent discovery of a class of sodalite-like clathrate superhydrides (e.g., YH6, YH9, ThH9, ThH10, and LaH10) at extreme pressures, which exhibit commonly a high-temperature superconductivity with the highest Tc approaching 260 K for LaH10, opened up a new era in search of high-temperature superconductors in metal superhydrides. There is a high interest towards the finding of alternative clathrate superhydrides that might witness the long-dreamed room-temperature superconductivity. Here, we target on the experimental synthesis of strongly-correlated europium (Eu) superhydrides where theory can fail for the prediction of superconductivity. We pressurized and laser-heated the mixture of metal Eu and ammonia borane (NH3BH3) in a diamond anvil cell and successfully synthesized the sodalite-like clathrate EuH6 and EuH9 at conditions of 152 GPa and 1,700 K, and 170 GPa and 2,800 K, respectively. Two non-clathrate structured phases of EuH5 and EuH6 were also synthesized that are not reported in lanthanide superhydrides. Calculated large H-derived electronic density of states at the Fermi level in clathrate EuH6 implies the potential of high temperature superconductivity. Our work created a model superhydride platform for subsequent investigation on how strongly-correlated effect in electronic structure can affect the superconductivity of superhydrides, a phenomenon that is not known thus far.
