2016/03/16 by Haishui Xu, H. C. Xu, X. H. Niu +19
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Anisotropy #Band gap #Condensed matter physics #Corporate Taxation and Avoidance #Iron-based superconductors research #Optics #Order (exchange) #Physics #Physics of Superconductivity and Magnetism #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.117.157003
published as Phys. Rev. Lett. 117, 157003 (2016) · 5 pages, 4 figures
arxiv created 2016/03/16 · openalex created_date 2016/06/24 · openalex publication_date 2016/10/07 · arxiv updated 2016/10/10 · openalex updated_date 2026/08/06
FeSe exhibits a novel ground state in which superconductivity coexists with a nematic order in the absence of any long-range magnetic order. Here, we report on an angle-resolved photoemission study on the superconducting gap structure in the nematic state of FeSe0.93S0.07, without the complications caused by Fermi surface reconstruction induced by magnetic order. We find that the superconducting gap shows a pronounced twofold anisotropy around the elliptical hole pocket near Z (0, 0, π), with gap minima at the end points of its major axis, while no detectable gap is observed around Γ (0, 0, 0) and the zone corner (π, π, kz). The large anisotropy and nodal gap distribution demonstrate the substantial effects of the nematicity on the superconductivity and thus put strong constraints on current theories.