单晶Na $_{1-δ}$ FeAs自旋密度波性质的光学研究
Optical study on the spin-density wave properties in single crystalline Na$_{1-δ}$FeAs
摘要：
报道了Na $_{1-δ}$ FeAs单晶面内电荷动力学的光学研究。观察到自旋密度波（SDW）带隙的明显光学证据。由于Na $_{1-δ}$ FeAs的结构/磁性转变是分离的，我们发现SDW能隙随着磁性转变而打开。与其他FeAs基母体化合物的光学响应相比，Na $_{1-δ}$ FeAs的能隙值2 $Δ$和能隙诱导的光谱权重重分布的能量尺度都较小.我们的研究结果支持的反铁磁转变的FeAs为基础的系统中的巡回起源。
英文摘要：
We report an optical investigation on the in-plane charge dynamics for Na$_{1-δ}$FeAs single crystal. A clear optical evidence for the spin-density wave (SDW) gap is observed. As the structural/magnetic transitions are separated in the Na$_{1-δ}$FeAs case, we find the SDW gap opens in accordance with the magnetic transition. Comparing with the optical response of other FeAs-based parent compounds, both the gap value 2$Δ$ and the energy scale for the gap-induced spectral weight redistribution are smaller in Na$_{1-δ}$FeAs. Our findings support the itinerant origin of the antiferromagnetic transition in the FeAs-based system.
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