Speakers: Deepa Kasinathan
Place: Zasedací místnost u knihovny (A53), FZÚ AVČR, Cukrovarnická 10, Praha 6
Organisers:
Oddělení magnetik a supravodičů
Relation of structure, magnetism, doping and pressure in
AFe2-xTxAs2 (A=Ca, Sr, Ba, Eu; T=Co, Rh, Ru)
Deepa Kasinathan
Max Planck Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, D-01187 Dresden, Germany
In a joint experimental and theoretical study we present an overview of recent results for the '122' compound family. We show thermodynamical measurements and band structure results for the undoped Sr-compound under ambient conditions, and also the influence of hydrostatic pressure and doping on the A site as well as 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 Tc up to 20 K for ambient pressure and up to 27 K for underdoped SrFe2-xCoxAs2 for pressures of 2.6 GPa. In our analysis, we attempt to disentangle the interplay of charge doping and structural changes induced by the substitution and by external pressure.
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