2016/11/17 by Oskar Vafek, Andrey V. Chubukov · 2 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Condensed matter physics #Corporate Taxation and Avoidance #Coupling (piping) #Doping #Iron-based superconductors research #Materials science #Mechanism (biology) #Physics #Quantum mechanics #Spin (aerodynamics) #Spin–orbit interaction #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.118.087003
published as Phys. Rev. Lett. 118, 087003 (2017) · 5 pages (main text) + 5 pages (supplementary material), 3 figures
arxiv created 2016/11/17 · openalex publication_date 2017/02/24 · arxiv updated 2017/02/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We present a novel mechanism of s-wave pairing in Fe-based superconductors. The mechanism involves holes near dxz/dyz pockets only and is applicable primarily to strongly hole doped materials. We argue that as long as the renormalized Hund's coupling J exceeds the renormalized interorbital Hubbard repulsion U', any finite spin-orbit coupling gives rise to s-wave superconductivity. This holds even at weak coupling and regardless of the strength of the intraorbital Hubbard repulsion U. The transition temperature grows as the hole density decreases. The pairing gaps are fourfold symmetric, but anisotropic, with the possibility of eight accidental nodes along the larger pocket. The resulting state is consistent with the experiments on KFe2As2.