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We carried out high resolution angle-resolved photoemission measurements onthe electronic structure and superconducting gap of K_0.68Fe_1.79Se_2 (T_c=32K) and (Tl_0.45K_0.34)Fe_1.84Se_2 (T_c=28 K) superconductors. In addition tothe electron-like Fermi surface near M(\pi,\pi), two electron-like Fermipockets are revealed around the zone center \Gamma(0,0) in K0.68Fe1.79Se_2.This observation makes the Fermi surface topology of K_0.68Fe_1.79Se_2consistent with that of (Tl,Rb)_xFe_{2-y}Se_2 and (Tl,K)_xFe_{2-y}Se_2compounds. A nearly isotropic superconducting gap (\Delta) is observed alongthe electron-like Fermi pocket near the M point in K_0.68Fe_1.79Se_2(\Delta\sim 9 meV) and (Tl_0.45K_0.34)Fe_1.84Se_2 (\Delta\sim 8 meV). Theestablishment of a universal picture on the Fermi surface topology andsuperconducting gap in the A_xFe_2-ySe_2 (A=K, Tl, Cs, Rb and etc.)superconductors will provide important information in understanding thesuperconductivity mechanism of the iron-based superconductors.

physical review. b, condensed matter and materials physics

Common Fermi Surface Topology and Nodeless Superconducting Gap in  K0.68Fe1.79Se2 and (Tl0.45K0.34)Fe1.84Se2 Superconductors Revealed from  Angle-Resolved Photoemission Spectroscopy