Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 13: Superconductivity: Fe-based Superconductors - 122
TT 13.9: Vortrag
Montag, 20. März 2017, 17:15–17:30, HSZ 103
Tuning the magnetism with As - local moments in BaFe2As2−δ — •Ilka Vinçon1,2, Rhea Kappenberger1,2, Federico Caglieris1, Hans-Joachim Grafe1, Anja Wolter-Giraud1, Christian Hess1, Saicharan Aswartham1, Sabine Wurmehl1,2, and Bernd Büchner1,2 — 1Leibniz Institute for Solid State and Materials Research Dresden IFW, Dresden, Germany — 2Institut für Festkörperphysik, TU Dresden, Dresden, Germany
An important aspect of iron based superconductors is the transition from magnetically ordered to a superconducting state by doping with various elements. As a novel type of doping, partial removal of arsenic from La(O1−xFx)FeAs1−δ has been shown to slightly increase the transition temperature while simultaneously creating local magnetic moments.
We present an extended analysis of arsenic deficient BaFe2As2−δ aiming to understand this unexpected behaviour. The impact of a variable arsenic deficiency on the spin density wave and local moment formation has been studied by means of magnetic susceptibility, resistivity and nuclear magnetic resonance measurements. Systematic structural changes have been determined by powder diffraction data.