Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)

Abstract

The low energy band structure and Fermi surface of the newly discovered superconductor, AxFe2Se2 (A=K,Cs), have been studied by angle-resolved photoemission spectroscopy. Compared with iron pnictide superconductors, AxFe2Se2 (A=K,Cs) is the most heavily electron-doped with Tc~30 K. Only electron pockets are observed with an almost isotropic superconducting gap of ~10.3 meV, while there is no hole Fermi surface near the zone center, which indicates the inter-pocket hopping or Fermi surface nesting is not a necessary ingredient for the unconventional superconductivity in iron-based superconductors. Thus, the sign changed s${}_{\pm }$ pairing symmetry, a leading candidate proposed for iron-based superconductors, becomes conceptually irrelevant in describing the superconducting state here. A more conventional s-wave pairing is a better description.

4 pages, 4 figures, published online in Nature Materials 2011

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• Superconducting dome and microstructure properties of Rb0.8Fe1.6+xSe2 superconductors
• Phase separation in iron chalcogenide superconductor Rb0.8+xFe1.6+ySe2 as seen by Raman light scattering and band structure calculations
• Iron-Based Superconductors as Parity Odd Superconductors
• Pairing Symmetry and Spin Excitations of Iron Selenide Superconductors
• Quasiparticle Scattering Interference in (K,Tl)FexSe2 Superconductors
• Dual Enhancement of Superconductivity in FeSe/SrTiO3 via Orbital and Correlation Synergy