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arXiv 2104.01094cond-mat.supr-con
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低Z超导体Be $_{22}$ Re的高压研究

High pressure study of low-Z superconductor Be$_{22}$Re

J. Lim, A. C. Hire, Y. Quan, J. Kim, L. Fanfarillo, S. R. Xie, R. S. Kumar, C. Park, R. J. Hemley, Y. K. Vohra, R. G. Hennig, P. J. Hirschfeld, G. R. Stewart, J. J. Hamlin

摘要:

与$T_c \sim 9.6~\mathrm{K}$一起,Be $_{22}$ Re表现出富Be化合物中最高的临界温度。我们对该化合物进行了一系列高压电阻率测量,压力达30 GPa。数据表明,临界温度$T_c$以$dT_c/dP = -0.05~\mathrm{K/GPa}$的速率逐渐被抑制。使用密度泛函理论(DFT)计算的电子和声子的态密度(DOS)和测量的临界温度,我们估计,在晶格硬化的快速增加在Be $_{22}$ Re的电子-离子相互作用与压力的适度增加,导致在$T_c$的减少。高压X射线衍射测量表明,环境压力下的晶体结构的Be $_{22}$ Re持续到至少154 GPa。讨论了低Z富Be超导体与高$T_c$超导体之间的关系。

英文摘要:

With $T_c \sim 9.6~\mathrm{K}$, Be$_{22}$Re exhibits one of the highest critical temperatures among Be-rich compounds. We have carried out a series of high-pressure electrical resistivity measurements on this compound to 30 GPa. The data show that the critical temperature $T_c$ is suppressed gradually at a rate of $dT_c/dP = -0.05~\mathrm{K/GPa}$. Using density functional theory (DFT) calculations of the electronic and phonon density of states (DOS) and the measured critical temperature, we estimate that the rapid increase in lattice stiffening in Be$_{22}$Re overwhelms a moderate increase in the electron-ion interaction with pressure, resulting in the decrease in $T_c$. High pressure x-ray diffraction measurements show that the ambient pressure crystal structure of Be$_{22}$Re persists to at least 154 GPa. We discuss the relationship between low-Z Be-rich superconductors and the high-$T_c$ superhydrides.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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