Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: SC: Iron-Based Superconductors - Theoretical Approaches

TT 17.1: Vortrag

Dienstag, 23. März 2010, 14:00–14:15, H20

Relation of structure, magnetism, doping and pressure in AFe_2−xT_xAs₂ (T=Co,Rh,Ru) — •Helge Rosner, Walter Schnelle, Deepa Kasinathan, Miriam Schmitt, Ulrich Schwarz, Michael Nicklas, Christoph Geibel, and Andreas Leithe-Jasper — MPI-CPfS Dresden, Germany

We present an overview of our recent investigations on the SrFe_2−xT_xAs₂ (T = Co, Ru, Rh) compounds. In our joint experimental and theoretical study, we report the influence of hydrostatic pressure and substitution at the Fe site on the magneto-structural and superconducting transitions. The magnetism is weakened upon the application of pressure as indicated by resistivity, X-ray data and density functional band structure calculations. Similar to substitution on the Sr site, substitutions on the Fe-site quench the magnetic transition and induce bulk superconductivity with T_c up to 20 K for ambient pressure and up to 27 K for underdoped SrFe_2−xCo_xAs₂ for pressures of 2.6GPa. In our analysis, we attempt to disentangle the interplay of charge doping and structural changes induced by the substitution and by external pressure.