[en] In this thesis a systematic light scattering study of the newly discovered iron-based superconductor Ba(Fe_1-xCo_x)₂As₂ is presented. The main focus is placed on the study of electronic properties in a doping range x in which magnetism and superconductivity are in close proximity. The experiment affords a window into band and momentum-dependent electronic properties. The magnetic order is predominantly itinerant. The structure of the superconducting gap indicates that the coupling potential may result from magnetic fluctuations.