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TT: Fachverband Tiefe Temperaturen

TT 45: Superconductivity: Ferropnictides 2

TT 45.3: Vortrag

Freitag, 27. März 2009, 10:45–11:00, HSZ 03

Magnetic and superconducting properties of REO_1−xF_xFeAs (RE=Ce, Sm, Pr, Gd) iron pnictide superconductors studied by muon spin relaxation — •H. Maeter¹, A. Kwadrin¹, H.-H. Klauss¹, H. Luetkens², R. Khasanov², A. Amato², R. Klingeler³, C. Hess³, J. Hamann-Borrero³, N. Leps³, A. Kondrat³, G. Behr³, J. Werner³, and B. Büchner³ — ¹Institut für Festkörperphysik, TU Dresden — ²Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland — ³Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden

We have investigated the superconducting properties and the interplay of iron and rare earth magnetic order in the iron-pnictide system REO_1−xF_xFeAs with RE=Ce, Gd, Pr, Sm and 0≤x≤0.5 by means of muon spin relaxation (µ⁺SR) and compare it with LaO_1−xF_xFeAs. We find that the undoped compounds show a variety of different magnetic coupling of the rare earth ion to the antiferromagnetic iron layers ranging from independent order to strong polarization of the rare earth moments by the ordered iron. Similar to LaO_1−xF_xFeAs the orthorhombic phase transition in REO_1−xF_xFeAs is also intimately connected to the suppression of magnetic order and the appearance of superconductivity.