Ba（Fe1-xCox）2As 2的各向异性面内电导
Anisotropic in-plane optical conductivity in detwinned Ba(Fe1-xCox)2As2
摘要：
我们研究了Ba（Fe_（1-x）Co_x）_2As_2（x=0，2.5%和4.5%）单晶在宽能量范围（3 meV-5 eV）内的各向异性面内光学电导率。对于低于Neel转变的温度，重构的费米表面的拓扑结构，结合散射率的不同行为，决定了低频光学响应的各向异性。对于巡回载流子，我们能够解开的德鲁德重量和散射率的演变，并观察到它们的增强沿正交反铁磁a轴相对于铁磁b轴。对于高于Ts的温度，单轴应力导致有限的面内各向异性。的光学电导率的各向异性，导致显着的二向色性，延伸到高频率的中红外和近红外区域。在所有掺杂的二向色性的温度依赖性的尺度与各向异性比的直流电导率，这表明的电子性质的结构转变。我们的研究结果证明了一个大的磁化率，耦合非常有效的单轴晶格应变。为了澄清磁性和费米表面拓扑结构的微妙的相互作用，我们比较我们的结果与从密度泛函理论内的全势能线性增广平面波方法的理论计算。
英文摘要：
We study the anisotropic in-plane optical conductivity of detwinned Ba(Fe1-xCox)2As2 single crystals for x=0, 2.5% and 4.5% in a broad energy range (3 meV-5 eV) across their structural and magnetic transitions. For temperatures below the Neel transition, the topology of the reconstructed Fermi surface, combined with the distinct behavior of the scattering rates, determines the anisotropy of the low frequency optical response. For the itinerant charge carriers, we are able to disentangle the evolution of the Drude weights and scattering rates and to observe their enhancement along the orthorhombic antiferromagnetic a-axis with respect to the ferromagnetic b-axis. For temperatures above Ts, uniaxial stress leads to a finite in-plane anisotropy. The anisotropy of the optical conductivity, leading to a significant dichroism, extends to high frequencies in the mid- and near-infrared regions. The temperature dependence of the dichroism at all dopings scales with the anisotropy ratio of the dc conductivity, suggesting the electronic nature of the structural transition. Our findings bear testimony to a large nematic susceptibility that couples very effectively to the uniaxial lattice strain. In order to clarify the subtle interplay of magnetism and Fermi surface topology we compare our results with theoretical calculations obtained from density functional theory within the full-potential linear augmented plane-wave method.
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