论文标题
阴离子在铁基超导性的配对相互作用中的作用
Role of anion in the pairing interaction of iron-based superconductivity
论文作者
论文摘要
基于与3D轨道的Fe原子的平面层和由阴离子协调的四面体，基于异常的晶格轨道几何形状的结构形成了高温的超导性。在这里，我们阐明了使用最先进的扫描隧道显微镜的铁阴离子在基于铁的超导体中的电子作用。通过测量局部电子结构，我们发现在BA0.4K0.6Fe2AS2中作为阴离子对电子配对具有惊人的影响。可以通过在原子尺度上删除/恢复原子的原子来关闭/恢复超导电子特征。我们的分析表明，这种显着的原子开关效应与阴离子介导的跳跃和非常规配对相互作用之间的几何合作有关。我们的结果发现，局部的Fe-Anion耦合对于基于铁的超导性的配对相互作用至关重要，并且有望具有电子配对的自下而上工程的潜力。
High-temperature iron-based superconductivity develops in a structure with unusual lattice-orbital geometry, based on a planar layer of Fe atoms with 3d orbitals and tetrahedrally coordinated by anions. Here we elucidate the electronic role of anions in the iron-based superconductors utilizing state-of-the-art scanning tunneling microscopy. By measuring the local electronic structure, we find that As anion in Ba0.4K0.6Fe2As2 has a striking impact on the electron pairing. The superconducting electronic feature can be switched off/on by removing/restoring As atoms on Fe layer at the atomic scale. Our analysis shows that this remarkable atomic switch effect is related to the geometrical cooperation between anion mediated hopping and unconventional pairing interaction. Our results uncover that the local Fe-anion coupling is fundamental for the pairing interaction of iron-based superconductivity, and promise the potential of bottom-up engineering of electron pairing.
