2008/07/31 by Rastko Sknepnek, German Samolyuk, Yong-bin Lee +2 · 1 citation
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Amplitude #Anisotropy #Condensed matter physics #Corporate Taxation and Avoidance #Coupling (piping) #Fermi surface #Iron-based superconductors research #Materials science #Pairing #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.79.054511
published as Phys. Rev. B 79, 054511 (2009) · Revised and substantially extended version, accepted for publication in Phys. Rev. B; 9 pages, 6 figures
arxiv created 2009/01/26 · openalex publication_date 2009/02/11 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We determine the anisotropy of the spin-fluctuation-induced pairing gap on the Fermi surface of the FeAs-based superconductors as function of the exchange and Hund's coupling JH. We find that for sufficiently large JH, nearly commensurate magnetic fluctuations yield a fully gapped s^\ifmmode±\else\textpm\fi-pairing state with small anisotropy of the gap amplitude on each Fermi-surface sheet, but significant variations of the gap amplitude for different sheets of the Fermi surface. In particular, we obtain the large variation of the gap amplitude on different Fermi-surface sheets, as seen in angular resolved photoemission spectroscopy experiments. For smaller values of Hund's coupling incommensurate magnetic fluctuations yield an s^\ifmmode±\else\textpm\fi-pairing state with line nodes. Such a state is also possible once the anisotropy of the material is reduced and three-dimensional effects come into play.