Development of angle dependent tunneling spectroscopy

磁场作用下的超导谱及其面内角度依赖性将为确定非常规超导体中的超导能隙对称性提供一种新的途径。 高质量的薄膜和器件的发展是非常必要的。本工作建立了制备铁基超导体母体化合物超薄膜的条件。通过低温准粒子激发研究了具有节点的铁基超导体的差距对称性及其在不同散射能级下的演化。

Tunneling spectrum under magnetic field and its in-plane angle dependence would offer a novel way to determine the superconducting gap symmetry in the unconventional superconductors. Development of high quality thin films and devices based on that are highly required. Conditions to make ultra-thin films of the parent compound of iron-based superconductors are established in this work. The gap symmetry of some iron-based superconductors having nodes is also investigated via quasi-particle excitation at low temperatures and their evolution for different scattering levels.