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We have performed high-resolution angle-resolved photoemission spectroscopyon heavily electron-doped non-superconducting (SC)BaFe$_{1.7}$Co$_{0.3}$As$_2$. We find that the two hole Fermi surface pocketsat the zone center observed in the hole-doped superconductingBa$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ are absent or very small in this compound,while the two electron pockets at the M point significantly expand due toelectron doping by the Co substitution. Comparison of the Fermi surface betweennon-SC and SC samples indicates that the coexistence of hole and electronpockets connected via the antiferromagnetic wave vector is essential inrealizing the mechanism of superconductivity in the iron-based superconductors.

Electronic structure of heavily electron-doped BaFe$_{1.7}$Co$_{0.3}$As$_2$ studied by angle-resolved photoemission