Dome _ like variation of the superconducting gap anisotropy in Fe-based superconductors

10th International Conference on Materials and Mechanisms of Superconductivity

Prozorov, R.^1 ; Cho, K.^1 ; Kim, H.^1 ; Tanatar, M.A.^1

Ames Laboratory, Department of Physics and Astronomy, Iowa State University, United States^1

关键词: Common features;    London penetration depth;    Long range magnetic order;    Measurements of;    Pairing mechanism;    Superconducting energy gap;    Superconducting gaps;    Temperature dependent;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/449/1/012020/pdf
DOI  :  10.1088/1742-6596/449/1/012020

来源: IOP

【 摘 要 】

Experiments performed on different iron-based superconductors suggest a variety of possible structures of the superconducting energy gap, both nodeless and nodal. To understand the pairing mechanisms, it is important to identify common features in the behavior of different materials. Measurements of the temperature-dependent London penetration depth provide important information on the structure of the superconducting gap. We show that despite significant differences between different iron-based superconductors, there is a universal trend: the gap is least anisotropic at the optimal doping and its anisotropy increases upon the departure towards underdoped and overdoped ends of the "superconducting dome". This trend is not related to the presence of the long-range magnetic order in the underdoped state.