F. Kurth, K. Iida, S. Trommler, J. Hänisch, K. Nenkov, J. Engelmann, S. Oswald, J. Werner, L. Schultz, B. Holzapfel, S. Haindl
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.
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http://arxiv.org/abs/1205.5219
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