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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 8: Superconductivity: Fe-based Superconductors - 122 Part 1

TT 8.11: Talk

Monday, March 26, 2012, 17:45–18:00, H 2053

Enhancement of the upper critical field in codoped iron-arsenic high-temperature superconductors — •H. Rosner1, M. Nicklas1, W. Schnelle1, A. Leithe-Jasper1, J. Wosnitza2, and F. Weickert1,31MPI CPfS Dresden — 2HLD Dresden-Rossendorf — 3LANL Los Alamos

We present the first study of codoped iron-arsenide superconductors of the 122 family (Sr/Ba)1−xKxFe2−yCoyAs2 with the purpose to increase the upper critical field Hc2 compared to single doped Sr/BaFe2As2 materials. Hc2 was investigated by measuring the magnetoresistance in high pulsed magnetic fields up to 64 T. We find, that Hc2 extrapolated to T = 0 is indeed enhanced significantly to 90 T for polycrystalline samples of Ba0.55K0.45Fe1.95Co0.05As2 compared to 75 T for Ba0.55K0.45Fe2As2 and BaFe1.8Co0.2As2 single crystals. Codoping thus is a promising way for the systematic optimization of iron-arsenic based superconductors for magnetic-field and high-current applications.

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