2014/02/24 by Yingbo Shi, Y. -B. Shi, Yaobo Huang +23
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Condensed matter physics #Corporate Taxation and Avoidance #Coupling (piping) #Doping #Electron #Fermi Gamma-ray Space Telescope #Fermi level #Fermi surface #Iron-based superconductors research #Materials science #Pairing #Physics #Quantum mechanics #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1088/0256-307x/31/6/067403
published as Chin. Phys. Lett. 31, 067403 (2014) · 5 pages, 4 figures
arxiv created 2014/02/24 · openalex publication_date 2014/06/01 · arxiv updated 2014/06/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report an angle-resolved photoemission investigation of optimally doped Ca 0.33 Na 0.67 Fe 2 As 2 . The Fermi surface topology of this compound is similar to that of the well-studied Ba 0.6 K 0.4 Fe 2 As 2 material, except for larger hole pockets resulting from a higher hole concentration per Fe atoms. We find that the quasi-nesting conditions are weakened in this compound compared to Ba 0.6 K 0.4 Fe 2 As 2 . Similar to Ba 0.6 K 0.4 Fe 2 As 2 , we observe nearly isotropic superconducting gaps with Fermi surface-dependent magnitudes for Ca 0.33 Na 0.67 Fe 2 As 2 . A small variation in the gap size along the momentum direction perpendicular to the surface is found for one of the Fermi surfaces. Our superconducting gap results on all Fermi surface sheets fit simultaneously very well to a global gap function derived from a strong coupling approach, which contains only 2 global parameters.