论文标题
Bafe $ _ {1.91} $ ni $ _ {0.09} $的Thz电动力学AS $ _ {2} $胶片在Multiband Eliashberg理论的框架中分析
THz electrodynamics of BaFe$_{1.91}$Ni$_{0.09}$As$_{2}$ film analyzed in the framework of multiband Eliashberg theory
论文作者
论文摘要
血浆频率，超氟密度和伦敦渗透深度的温度依赖性取决于电导率的Terahertz光谱和BAFE $ _ {1.91} $ ni $ _ {0.09} $ as $ _ {2} $ as $ _ {2} $的介电介电常数，其具有关键的温度$ t_c = 19.6 $ 〜K 〜K 〜K。在一个简单的三频EliAshberg模型中分析了一部分实验数据，其中超导耦合的机制是由防铁磁性自旋波动介导的，其特征性$ω_{0} $根据$ t_ {c} $根据经验性的法律$ t_ {c} $根据经验性定律$ω_________________________________________{电子 - 玻色子耦合强度$λ_{tot} = 2.17 $。
The temperature dependences of the plasma frequency, superfluid density and London penetration depth were determined from terahertz spectra of conductivity and dielectric permittivity of BaFe$_{1.91}$Ni$_{0.09}$As$_{2}$ film with critical temperature $T_c=19.6$~K. Part of experimental data were analyzed within a simple three-band Eliashberg model where the mechanism of superconducting coupling is mediated by antiferromagnetic spin fluctuations, whose characteristic energy $Ω_{0}$ scales with $T_{c}$ according to the empirical law $Ω_{0} = 4.65k_{B}T_{c}$, and with a total electron-boson coupling strength $λ_{tot} = 2.17$.
