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We have performed high-resolution angle-resolved photoemission spectroscopyof iron-chalcogenide superconductor Fe1.03Te0.7Se0.3 (Tc = 13 K) to investigatethe electronic structure relevant to superconductivity. We observed a hole- andan electron-like Fermi surfaces at the Brillouin zone center and corner,respectively, which are nearly nested by the Q~(pi, pi) wave vector. We do notfind evidence for the nesting instability with Q~(pi+delta, 0) reminiscent ofthe antiferromagnetic order in the parent compound Fe1+yTe. We have observed anisotropic superconducting gap along the hole-like Fermi surface with the gapsize Delta of ~4 meV (2Delta/kBTc~7), demonstrating the strong-coupling natureof the superconductivity. The observed similarity of low-energy electronicexcitations between iron-chalcogenide and iron-arsenide superconductorsstrongly suggests that common interactions which involve Q~(pi, pi) scatteringare responsible for the superconducting pairing.

physica c superconductivity

Angle-Resolved Photoemission Spectroscopy of Iron-Chalcogenide  Superconductor Fe1.03Te0.7Se0.3 : Strong-Coupling Superconductivity and  Universality of Inter-Band Scattering