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Measurement of the c-axis optical reflectance of AFe$_2$As$_2$ (A=Ba, Sr) single crystals: Evidence of different mechanisms for the formation of two energy gaps

机译:测量aF轴的c轴光学反射率$ _2 $ as $ _2 $(a = Ba,   sr)单晶:形成不同机制的证据   两个能隙

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摘要

We present the c-axis optical reflectance measurement on single crystals ofBaFe$_2$As$_2$ and SrFe$_2$As$_2$, the parent compounds of FeAs basedsuperconductors. Different from the ab-plane optical response where twodistinct energy gaps were observed in the SDW state, only the smaller energygap could be seen clearly for \textbf{E}$\parallel$c-axis. The very pronouncedenergy gap structure seen at a higher energy scale for\textbf{E}$\parallel$ab-plane is almost invisible. We propose a novel picturefor the band structure evolution across the SDW transition and suggestdifferent driving mechanisms for the formation of the two energy gaps.
机译:我们介绍了BaFe $ _2 $ As $ _2 $和SrFe $ _2 $ As $ _2 $(基于FeAs的超导体的母体)单晶的c轴光学反射率测量。与在SDW状态下观察到两个明显的能隙的ab平面光学响应不同,对于\ textbf {E} $ \ parallel $ c轴,只能清楚地看到较小的能隙。在\ textbf {E} $ \ parallel $ ab平面的较高能级上看到的非常明显的能隙结构几乎是不可见的。我们为跨越SDW跃迁的能带结构演化提出了一幅新颖的图片,并提出了形成两个能隙的不同驱动机制。

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