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最近发现的超导转变温度高达55K铁基高温超导体结束了铜氧化物在超导转变温度高于40K的领域一统天下的局面.与铜氧化物高温超导体一样,超导配对对称性对于理解这一新的体系有着重要的作用.文章利用角分辨光电子能谱实验手段,全面地研究了铁基材料的能带结构和费米面以及它们随载流子掺杂浓度变化的演化过程,发现了铁基超导体中依赖费米面的无节点的超导能隙,指出了费米面间的相互作用对超导配对起着关键作用.
Recently discovered superconducting transition temperatures up to 55K iron-based high-temperature superconductors have ended the monolithic situation of copper oxides in areas where the superconducting transition temperature is above 40 K. As with copper-oxide high-temperature superconductors, superconducting pairing symmetry is important for understanding this The new system has an important role.In this paper, we use the angle-resolved photoelectron spectroscopy to comprehensively study the energy band structure and Fermi surface of iron-based materials and their evolution with the carrier doping concentration changes. The superconductor depends on the nodeless superconducting energy gap of the Fermi surface and points out that the interaction between Fermi surfaces plays a key role in superconducting pairing.