title: Phase diagram and a possible unified description of intercalated iron selenide superconductors.
abstract: We propose a theoretical description of the phase diagram and physical properties in A(2)Fe(4)Se(5)-type (A=K, Tl) compounds based on a coexistent local moment and itinerant electron picture. Using neutron scattering and angle-resolved photoemission spectroscopy measurements to fix the general structure of the local moment and itinerant Fermi pockets, we find a superconducting phase with s-wave pairing at the M pockets and an incipient sign-change s wave near the Γ point, which is adjacent to the insulating phases. The uniform susceptibility and resistivity are found to be consistent with the experiment. The main distinction with iron pnictide superconductors is also discussed.
authors: Institute for Advanced Study, Tsinghua University, Beijing, China.
authors: Yi-Zhuang
authors: YZ
authors: You
authors: Fan
authors: F
authors: Yang
authors: Su-Peng
authors: SP
authors: Kou
authors: Zheng-Yu
authors: ZY
authors: Weng