Véronique Brouet, M. Marsi, B. Mansart, M.F. Jensen, A. Nicolaou, Laboratoire de Physique des Solides d’Orsay, UMR8502, France
A. Taleb-Ibrahimi, P. Le Fèvre, F. Bertran, CASSIOPEE beamline, Synchotron SOLEIL, France
D. Colson, A. Forget, F. Rullier-Albenque, SPEC, CEA Saclay (CNRS URA 2464), France

We present a compared investigation of the electronic structure of two families of iron pnictides, where superconductivity is achieved either by electron doping or by isovalent substitution. We observe a similar Fermi Surface in the two cases, but with quite a different number of carriers (both holes and electrons). We also observe significantly different Fermi velocities, suggesting different renormalization effects. These are probably important parameters to describe the superconducting state and we compare this situation to that of BaFe₂(As_1-xP_x)₂.