Electronic phase diagram of disordered Co doped BaFe2As2
  Superconducting and normal state transport properties in iron pnictides are sensitive to disorder and impurity scattering. By investigation of Ba(Fe1-xCox)2As2 thin films with varying Co concentration, we demonstrate that in the dirty limit the superconducting dome in the electronic phase diagram of Ba(Fe1-xCox)2As2 shifts towards lower doping concentrations, which differs significantly from observations in single crystals. We show that especially in the underdoped regime superconducting transition temperatures higher than 27 K are possible. 
F. Kurth, K. Iida, S. Trommler, J. H\"anisch, K. Nenkov, J. Engelmann,   S. Oswald, J. Werner, L. Schultz, B. Holzapfel, S. ...
cond-mat.supr-con