Regensburg 2013 – wissenschaftliches Programm
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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 Weikert2,3, 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 A1−xKxFe2−yTyAs2 (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.