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We observed the anisotropic superconducting-gap (SC-gap) structure of aslightly overdoped superconductor, Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$($x=0.1$), using three-dimensional (3D) angle-resolved photoemissionspectroscopy. Two hole Fermi surfaces (FSs) observed at the Brillouin zonecenter and an inner electron FS at the zone corner showed a nearly isotropic SCgap in 3D momentum space. However, the outer electron FS showed an anisotropicSC gap with nodes or gap minima around the M and A points. The differentanisotropies obtained the SC gap between the outer and inner electron FSscannot be expected from all theoretical predictions with spin fluctuation,orbital fluctuation, and both competition. Our results provide a new insightinto the SC mechanisms of iron pnictide superconductors.

Anomalous Superconducting-Gap Structure of Slightly Overdoped Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$