Evidences of Mott physics in iron pnictides from x-ray spectroscopy
  X-ray emission and absorption spectroscopies are jointly used as fast probes to determine the evolution as a function of doping of the fluctuating local magnetic moments in K- and Cr- hole-doped BaFe2As2. An increase in the local moment with hole-doping is found, supporting the theoretical scenario in which a Mott insulating state that would be realized for half-filled conduction bands has an influence throughout the phase diagram of these iron-pnictides. 
S. Lafuerza, H. Gretarsson, F. Hardy, T. Wolf, C. Meingast, G.   Giovannetti, M. Capone, A. S. Sefat, Y.-J. Kim, P. Glatzel ...
cond-mat.supr-con cond-mat.str-el