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Angle resolved photoemission spectroscopy of Ba(Fe1-xCox)2As2 (x = 0.06,0.14, and 0.24) shows that the width of the Fe 3d yz/zx hole band depends onthe doping level. In contrast, the Fe 3d x^2-y^2 and 3z^2-r^2 bands are rigidand shifted by the Co doping. The Fe 3d yz/zx hole band is flattened at theoptimal doping level x = 0.06, indicating that the band renormalization of theFe 3d yz/zx band correlates with the enhancement of the superconductingtransition temperature. The orbital-dependent and doping-dependent bandrenormalization indicates that the fluctuations responsible for thesuperconductivity is deeply related to the Fe 3d orbital degeneracy.

Doping-Dependent and Orbital-Dependent Band Renormalization in Ba(Fe_1-xCo_x)_2As_2 Superconductors