论文标题
压缩硒中超导相的强偶联特征
Strong-coupling character of superconducting phase in compressed selenium hydride
论文作者
论文摘要
目前，金属氢化物被认为是声子介导的超导体的高度有希望的材料，这些材料表现出临界温度的高值。在本研究中，分析了以最简单形式（HSE）的压缩硒的超导性能，以实现此阶段的定量表征。通过使用最先进的Migdal-Eliashberg形式主义，可以证明该材料中的临界温度相对较高（$ t_ {C} $ = 42.65 K），并超过了二吡啶镁镁的超导体水平，假设Coulomb Pseudoptential的价值为0.1美元。此外，采用的理论模型使我们能够表征其他关键热力学特性，例如超导带隙，自由能，特定的热量和临界磁场。在接下来的内容中，表明上述参数的特征热力比率与Bardeen-Cooper-Schrieffer理论的预测不同。结果，我们认为强耦合和延迟效应在讨论的超导状态中起着重要作用，这在弱耦合方面无法描述。
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.
