Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.28: Poster
Montag, 31. März 2014, 15:00–19:00, P2
Antimony Substitution in Rare Earth 1111-Compounds — •Daniel Schmidt, Sebastian Wolf, and Hans F. Braun — Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth
The rare earth iron arsenide 1111-compounds are well known oxy-pnictide high Tc superconductors. The phase diagram of the undoped compounds shows generally two parts, a magnetic and a superconducting phase. With sufficient electron doping in the charge carrier layer, that is substitution of oxygen with fluorine, the magnetic phase transition disappears and superconductivity arises. In our work we try to regain the magnetic phase from the superconducting one. Therefore we perform isostructural substitution at the iron arsenide layer by substituting As with Sb atoms in superconducting electron doped polycrystalline samples. We probe the doping level of Sb by observing the lattice parameters thus we can also test for impurity phases. The physical properties are observed by low temperature measurements of the resistivity and susceptibility.