论文标题
掺杂的铁磷脂中的散射速率和超导性之间的联系
Linkage between scattering rates and superconductivity in doped ferropnictides
论文作者
论文摘要
我们报告了一系列孔和电子掺杂铁的超导体，其母体化合物BAFE2AS2以及其堂兄BACR2AS2和BACO2AS2的角度分辨光发射研究。我们关注能量（E）依赖的散射速率γ（E）作为3D计数的函数以及内部孔袋的重新归一化函数Z（e），这是这些化合物中的热点。我们在能量散射速率伽马（E >> kBT）中获得了非纤维 - 液样线性，与掺杂剂浓度无关。主要的结果是斜率β=伽马（E >> kBt）/e，在最佳掺杂和尺度上以超导过渡温度达到其最大值。这支持了这些材料超导性的自旋波动模型。在最佳孔掺杂化合物中，内孔袋的散射速率的斜率大约是普朗克极限伽马（E）/e〜1的三倍。该结果与重新归一化函数z（e）信号的能量依赖性在正常状态下非常不一致的电荷载体，在低温下转化为一致的非常规超导状态。
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.
