论文标题
铁 - 阿森尼超导体中的同源性旋转密度波和超导差距各向异性
Isostructural spin-density-wave and superconducting gap anisotropies in iron-arsenide superconductors
论文作者
论文摘要
通过相变时，电子系统通过在费米级别打开能量差距来节省能量。描述能量差距各向异性提供了有关驱动相变相互作用的起源的见解。在这里，我们报告了有关在sr $ _ {1-x} $ _x $ _x $ _x $ fe $ _2 $ as $ _2 $ as $ _2 $中的四方磁和超导阶段中详细的差距各向异性的研究角度分辨光发射光谱（ARPES）研究。首先，我们发现旋转密度波（SDW）间隙在四方磁相中强烈各向异性。间隙幅度与费米表面的轨道特征密切相关。其次，我们发现SDW差距各向异性是针对角度依赖性，间隙最小值位置和相对间隙幅度的超导差距各向异性的同一结构。我们的结果表明，超导配对相互作用和磁相互作用具有相同的来源。轨道内散射在构建这些相互作用方面起着重要作用，导致基于铁的超导体的轨道选择性磁性和超导性。
When passing through a phase transition, electronic system saves energy by opening energy gaps at the Fermi level. Delineating the energy gap anisotropy provides insights into the origin of the interactions that drive the phase transition. Here, we report the angle-resolved photoemission spectroscopy (ARPES) study on the detailed gap anisotropies in both the tetragonal magnetic and superconducting phases in Sr$_{1-x}$Na$_x$Fe$_2$As$_2$. First, we found that the spin-density-wave (SDW) gap is strongly anisotropic in the tetragonal magnetic phase. The gap magnitude correlates with the orbital character of Fermi surface closely. Second, we found that the SDW gap anisotropy is isostructural to the superconducting gap anisotropy regarding to the angular dependence, gap minima locations, and relative gap magnitudes. Our results indicate that the superconducting pairing interaction and magnetic interaction share the same origin. The intra-orbital scattering plays an important role in constructing these interactions resulting in the orbital-selective magnetism and superconductivity in iron-based superconductors.
