APRES study of in-plane element substituted iron-based superconductors Ba(Fe$_{1-x}$Co$_{x})_{2}$As$_{2}$ and Ba(Fe$_{1-x}$Ni$_{x})_{2}$As$_{2}$

Much excitement has surrounded the recent discovery of the doped iron pnictides which exhibit high temperature superconductivity. These new materials are generally grouped into either 1111 or 122 compounds by the stoichiometric formula of the parent compounds. Understanding how doping with in-plane elements with different valence affects their superconducting properties is a vital element of working toward a complete picture of these interesting new compounds. To that end, we have conducted a high-resolution ARPES study of two 122 compounds: Ba(Fe$_{1-x}$Co$_{x})_{2}$As$_{2}$ and Ba(Fe$_{1-x}$Ni$_{x})_{2}$As$_{2 }$and will report our results.