arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2004.08942cond-mat.supr-con
收藏

压缩硒氢化物超导相的强耦合特性

Strong-coupling character of superconducting phase in compressed selenium hydride

Ewa A. Drzazga-Szczȩśniak, Adam Z. Kaczmarek

摘要:

目前,金属氧化物被认为是非常有前途的声子介导超导体材料,表现出高的临界温度值。在本研究中,压缩氢化硒在其最简单的形式(HSe)的超导性能进行了分析,对这一阶段的定量表征。利用Migdal-Eliashberg公式计算表明,在库仑赝势取$0.1$的情况下,该材料的临界温度较高($T_{c}$ =42.65 K),超过了二硼化镁超导体的临界温度。此外,所采用的理论模型使我们能够表征其他关键的热力学性质,如超导带隙,自由能,比热和临界磁场。在下文中,它表明,上述参数的特征热力学比不同于Bardeen-Cooper-Schrieffer理论的预测。因此,我们认为强耦合和延迟效应在所讨论的超导态中起着重要的作用,这不能在弱耦合制度中描述。

英文摘要:

At present, metal hydrides are considered highly promising materials for phonon-mediated superconductors, that exhibit high values of the critical temperature. In the present study, the superconducting properties of the compressed selenium hydride in its simplest form (HSe) are analyzed, toward quantitative characterization of this phase. By using the state-of-art Migdal-Eliashberg formalism, it is shown that the critical temperature in this material is relatively high ($T_{c}$=42.65 K) and surpass the level of magnesium diboride superconductor, assuming that the Coulomb pseudopotential takes value of $0.1$. Moreover, the employed theoretical model allows us to characterize other pivotal thermodynamic properties such as the superconducting band gap, the free energy, the specific heat and the critical magnetic field. In what follows, it is shown that the characteristic thermodynamic ratios for the aforementioned parameters differ from the predictions of the Bardeen-Cooper-Schrieffer theory. As a result, we argue that strong-coupling and retardation effects play important role in the discussed superconducting state, which cannot be described within the weak-coupling regime.

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。

↑