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Highly Anisotropic and Twofold Symmetric Superconducting Gap in Nematically Ordered FeSe 0.93 S 0.07

DOI: 10.1103/PhysRevLett.117.157003 DOI Help

Authors: H. C. Xu (State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University) , X. H. Niu (State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University) , D. F. Xu (State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University) , J. Jiang (State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University) , Q Yao (Fudan University) , Q. Y. Chen (State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University) , Q. Song (State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University) , M. Abdel-hafiez (Center for High Pressure Science and Technology Advanced Research; Faculty of science, Physics Department, Fayoum University) , D. A. Chareev (Institute of Experimental Mineralogy, Russian Academy of Sciences; Institute of Physics and Technology, Ural Federal University) , A. N. Vasiliev (Institute of Physics and Technology, Ural Federal University; Low Temperature Physics and Superconductivity Department, M.V. Lomonosov Moscow State University) , Q. S. Wang (State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University) , H. L. Wo (State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University) , J. Zhao (State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University) , R. Peng (State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University) , D. L. Feng (State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 117

State: Published (Approved)
Published: October 2016
Diamond Proposal Number(s): 11914 , 12849

Abstract: 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.

Journal Keywords: superconductivity, photoemission

Subject Areas: Physics


Instruments: I05-ARPES

Other Facilities: Stanford Synchrotron Radiation Lightsource