Comprehensive Eliashberg analysis of microwave conductivity and penetration depth of K-, Co-, and P-substituted BaFe2As2
Comprehensive Eliashberg analysis of microwave conductivity and penetration depth of K-, Co-, and P-substituted BaFe2As2
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DOI：
10.1103/physrevb.99.134518
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发表时间：
2019-04
影响因子：
3.7
通讯作者：
D. Torsello;D. Torsello;G. Ummarino;G. Ummarino;L. Gozzelino;L. Gozzelino;T. Tamegai;G. Ghigo;G. Ghigo
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文献类型：
--
作者：
D. Torsello;D. Torsello;G. Ummarino;G. Ummarino;L. Gozzelino;L. Gozzelino;T. Tamegai;G. Ghigo;G. Ghigo
我们报告相结合的实验和理论分析的微波频率的电磁响应的BaFe 2As 2单晶与不同的取代：K在Ba网站（空穴掺杂），Co在Fe网站（电子掺杂），和P在作为网站（等价取代）。使用共面谐振器技术的测量导致实验测定的穿透深度和微波传导率作为温度的函数。在自洽的三波段$s_{\pm}$-波Eliashberg方法内分析了整个数据集，能够解释不同属性中的所有主要观测特征。除了模型本身的验证，实验和理论之间的比较允许讨论的Fe-As平面在定义这些化合物的超导性质，相干效应的相关性，和超导序参数中的节点的存在下可能发挥的作用。
We report on the combined experimental and theoretical analysis of the microwave-frequency electromagnetic response of BaFe2As2 single crystals with different substitutions: K in the Ba site (hole doping), Co in the Fe site (electron doping), and P in the As site (isovalent substitution). Measurements using a coplanar resonator technique lead to the experimental determination of the penetration depth and microwave conductivity as a function of temperature. The whole set of data is analyzed within a self-consistent three-band $s_{\pm}$-wave Eliashberg approach, able to account for all the main observed features in the different properties. Besides the validation of the model itself, the comparison between experiment and theory allows discussing the possible role of the Fe-As planes in defining the superconducting properties of these compounds, the relevance of coherence effects, and the presence of nodes in the superconducting order parameter.