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TT: Fachverband Tiefe Temperaturen

TT 27: Superconductivity: Fe-based Superconductors - 122

TT 27.2: Vortrag

Dienstag, 12. März 2013, 10:00–10:15, H18

Electronic structure, magnetic and superconducting properties of co-doped iron-arsenide superconductors — •Helge Rosner¹, Walter Schnelle¹, Franziska Weikert^2,3, Michael Nicklas¹, Jochen Wosnitza³, and Andreas Leithe-Jasper¹ — ¹MPI CPfS Dresden — ²Los Alamos National Laboratory, New Mexico, US — ³HLD Dresden Rossendorf

We present a joint experimental and theoretical study of co-doped iron-arsenide superconductors of the 122 family A_1−xK_xFe_2−yT_yAs₂ (A=Ba,Sr,Eu; T=Co,Ru,Rh). In these systems, the co-doping enables the separation of different parameters - like electron count, disorder or the specific geometry of the FeAs layer - with respect to the position of the respective compounds in the general 122 phase diagram. For a series of compounds, we investigate the relevance of the different parameters for the magnetic, thermodynamic and superconducting properties. Our experimental investigations are supported by density functional electronic structure calculations applying different approximations for doping and disorder.