arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.05014cond-mat.mtrl-scicond-mat.supr-con
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三元氢化物Li $_2$ SiH $_6$的高压相变和超导电性

Phase Transitions and Superconductivity in Ternary Hydride Li$_2$SiH$_6$ at High Pressures

Sixuan Wu, Bin Li, Zhi Chen, Yu Hou, Yan Bai, Xiaofeng Hao, Yeqian Yang, Shengli Liu, Jie Cheng, Zhixiang Shi

摘要:

我们预测了一种新的三元氢化物Li $_2$ SiH $_6$在高压下。对Li $_2$ SiH $_6$化合物的结构进行了系统的研究,发现了具有有趣的电子和声子性质的新的稳定相。结果表明,$_2$-SiH-$_6$在常压至400 GPa范围内是动态稳定的,具有三个新相:P312,P $\bar{3}$和P $\bar{6}$ 2 m.电子-声子耦合计算结合Bardeen-Cooper-Schrieffer的论证表明该化合物可能是高压下高$T_c$超导体的候选者。特别地,$P\bar{6}2m$ -Li $_2$ SiH $_6$的最大$T_c$在400 GPa下达到56 K。这些发现可能为在致密富氢化合物中获得室温超导体铺平道路。

英文摘要:

We predicted a new ternary hydride Li$_2$SiH$_6$ at high pressures. A systematic structure search in Li$_2$SiH$_6$ compound reveals novel stable phases with intriguing electronic and phonon properties. It is found that Li$_2$SiH$_6$ is dynamically stable from ambient pressure up to 400 GPa with three novel phases: P312, P$\bar{3}$, and P$\bar{6}$2m. The calculation of electron-phonon coupling combined with Bardeen-Cooper-Schrieffer's argument indicates that this compound may be a candidate for high $T_c$ superconductors under high pressures. In particular, the maximum $T_c$ of $P\bar{6}2m$-Li$_2$SiH$_6$ at 400 GPa reaches 56 K. These findings may pave the way for obtaining room temperature superconductors in dense hydrogen-rich compounds.

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