Angle-resolved photoemission evidence of s-wave superconducting gap in KxFe2-ySe2 superconductor

Abstract

Although nodeless superconducting gap has been observed on the large Fermi pockets around the zone corner in KxFe2-ySe2, whether its pairing symmetry is s-wave or nodeless d-wave is still under intense debate. Here we report an isotropic superconducting gap distribution on the small electron Fermi pocket around the Z point in KxFe2-ySe2, which favors the s-wave pairing symmetry.

4 pages, 4 figures

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• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Unified picture of the doping dependence of superconducting transition temperatures in alkali metal/ammonia intercalated FeSe
• Suppression of superconductivity by Neel-type magnetic fluctuations in the iron pnictides
• Quantum Monte Carlo Study of Pairing Symmetry and Correlation in Iron-based Superconductors
• Metamorphoses of electronic structure of FeSe-based superconductors (Review article)
• Optical conductivity of iron-based superconductors
• Crossed Andreev reflection in altermagnets
• Revealing the Heavy Quasiparticles in the Heavy-Fermion Superconductor CeCu2Si2
• Unconventional fully-gapped superconductivity in the heavy-fermion metal CeCu${}_2$Si${}_2$
• Collective modes in multiband superconductors: Raman scattering in iron selenides
• Displacement and annihilation of Dirac gap-nodes in d-wave iron-based superconductors
• Multiple superconducting phases in heavy-fermion metals
• Possible pairing symmetry in the FeSe-based superconductors determined by quasiparticle interference
• Superconductivity by Hidden Spin Fluctuations in Electron-Doped Iron Selenide
• Evidence of superconductivity-induced phonon spectra renormalization in alkali-doped iron selenides
• Fermi surface evolution and checker-board block-spin antiferromagnetism in $A_x$Fe${}_{2-y}$Se${}_2$
• Weak Spin Fluctuation with Finite Wave Vector and Superconducting Gap Symmetry in KxFe2-ySe2: 77Se Nuclear Magnetic Resonance
• In-gap bound states induced by a single nonmagnetic impurity in sign-preserving s-wave superconductors with incipient bands