Pairing Symmetry in Iron-Pnictide Superconductor KFe$_2$As$_2$
Abstract
The pairing symmetry is one of the major issues in the study of iron-based superconductors. We adopt a low-energy effective kinetic model based on the first-principles band structure calculations combined with the - model for KFeAs, the phase diagram of pairing symmetries is constructed. Putting the values of and of the - model obtained by the first-principles calculations into this phase diagram, we find that the pairing symmetry for KFeAs is a nodal -wave in the folded Brillouin zone with two iron atoms per unit cell. This is in good agreement with experiments observed a nodal order parameter.
Keywords
Cite
@article{arxiv.1203.2581,
title = {Pairing Symmetry in Iron-Pnictide Superconductor KFe$_2$As$_2$},
author = {Wei Li and Jian Li and Jian-Xin Zhu and Yan Chen and C. S. Ting},
journal= {arXiv preprint arXiv:1203.2581},
year = {2015}
}
Comments
5 pages, 4 figures (The pairing symmetry is dependent on choosing an effective tight-binding model. In the publication version, we adopt a ten-orbital model by using the maximally localized Wannier functions based on the first-principles band structure calculations, and give an s-wave pairing for KFe$_2$As$_2$)