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THz electrodynamics of BaFe1.91Ni0.09As2 film analyzed in the framework of multiband Eliashberg theory
Superconductor Science and Technology ( IF 3.7 ) Pub Date : 2020-05-20 , DOI: 10.1088/1361-6668/ab87ae
G A Ummarino 1, 2 , A V Muratov 3 , L S Kadyrov 4 , B P Gorshunov 4 , S Richter 5, 6 , A Anna Thomas 5, 6 , R Hhne 5 , Y A Aleshchenko 3
Affiliation  

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 $\Omega_{0}$ scales with $T_{c}$ according to the empirical law $\Omega_{0} = 4.65k_{B}T_{c}$, and with a total electron-boson coupling strength $\lambda_{tot} = 2.17$.

中文翻译:

BaFe1.91Ni0.09As2薄膜的太赫兹电动力学在多波段Eliashberg理论框架下分析

从具有临界温度的 BaFe$_{1.91}$Ni$_{0.09}$As$_{2}$ 薄膜的电导率和介电常数的太赫兹光谱确定等离子体频率、超流体密度和伦敦穿透深度的温度依赖性$T_c=19.6$~K。部分实验数据在一个简单的三波段 Eliashberg 模型中进行分析,其中超导耦合的机制是由反铁磁自旋波动介导的,其特征能量 $\Omega_{0}$ 根据经验定律与 $T_{c}$ 成比例$\Omega_{0} = 4.65k_{B}T_{c}$,总电子-玻色子耦合强度 $\lambda_{tot} = 2.17$。
更新日期:2020-05-20
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