4.7 Article

Is sodium a superconductor under high pressure?

期刊

JOURNAL OF CHEMICAL PHYSICS
卷 146, 期 1, 页码 -

出版社

AMER INST PHYSICS
DOI: 10.1063/1.4973549

关键词

-

资金

  1. U.S. DOE Early Career Award [DE-SC0006433]
  2. Colorado School of Mines (CSM)

向作者/读者索取更多资源

Superconductivity has been predicted or measured for most alkali metals under high pressure, but the computed critical temperature (T-c) of sodium (Na) at the face-centered cubic (fcc) phase is vanishingly low. Here we report a thorough, first-principles investigation of superconductivity in Na under pressures up to 260 GPa, where the metal-to-insulator transition occurs. Linear-response calculations and density functional perturbation theory were employed to evaluate phonon distributions and the electron-phonon coupling for bcc, fcc, cI16, and tI19 Na. Our results indicate that the maximum electron-phonon coupling parameter, lambda, is 0.5 for the cI16 phase, corresponding to a theoretical peak in the critical temperature at T-c approximate to 1.2 K. When pressure decreases or increases from 130 GPa, T-c drops quickly. This is mainly due to the lack of p-d hybridization in Na even at 260 GPa. Since current methods based on the Eliashberg and McMillian formalisms tend to overestimate the T-c (especially the peak values) of alkali metals, we conclude that under high pressure-before the metal-to-insulator transition at 260 GPa-superconductivity in Na is very weak, if it is measurable at all. Published by AIP Publishing.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据