掺杂铁磷族化合物中散射率与超导电性之间的联系
Linkage between scattering rates and superconductivity in doped ferropnictides
摘要：
我们报告了一系列的空穴和电子掺杂的铁基超导体，它们的母体化合物BaFe 2As 2，和它们的表兄弟BaCr 2As 2和BaCo 2As 2的角分辨光电子能谱研究。我们着重于能量（E）依赖的散射率γ（E）作为3d计数的函数和内空穴袋的重整化函数Z（E），这是这些化合物中的热点。我们得到了非费米液体的线性能量散射率γ（E>> kBT），与掺杂浓度无关。主要结果是斜率β =Gamma（E >> kBT）/E在最佳掺杂附近达到最大值，并与超导转变温度成比例。这支持了这些材料的超导性的自旋涨落模型。在最佳空穴掺杂的化合物中，内空穴袋的散射率的斜率约为普朗克极限Gamma（E）/E~1的3倍。该结果与重整化函数Z（E）的能量依赖性一起表示在正常状态下非常不相干的载流子，其在低温下转变为相干的非常规超导状态。
英文摘要：
We report an angle-resolved photoemission study of a series of hole and electron doped iron-based superconductors, their parent compound BaFe2As2, and their cousins BaCr2As2 and BaCo2As2. We focus on the energy (E) dependent scattering rate Gamma(E) as a function of the 3d count and on the renormalization function Z(E) of the inner hole pocket, which is the hot spot in these compounds. We obtain a non-Fermi-liquid-like linear in energy scattering rate Gamma(E>> kBT), independent of the dopant concentration. The main result is that the slope beta=Gamma(E >> kBT)/E, reaches its maxima near optimal doping and scales with the superconducting transition temperature. This supports the spin fluctuation model for superconductivity for these materials. In the optimally hole-doped compound, the slope of the scattering rate of the inner hole pocket is about three times bigger than the Planckian limit Gamma(E)/E~1. This result together with the energy dependence of the renormalization function Z(E) signals very incoherent charge carriers in the normal state which transform at low temperatures to a coherent unconventional superconducting state.
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