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TT: Fachverband Tiefe Temperaturen
TT 45: Superconductivity: Ferropnictides 2
TT 45.3: Talk
Friday, March 27, 2009, 10:45–11:00, HSZ 03
Magnetic and superconducting properties of REO1−xFxFeAs (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 REO1−xFxFeAs with RE=Ce, Gd, Pr, Sm and 0≤x≤0.5 by means of muon spin relaxation (µ+SR) and compare it with LaO1−xFxFeAs. 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 LaO1−xFxFeAs the orthorhombic phase transition in REO1−xFxFeAs is also intimately connected to the suppression of magnetic order and the appearance of superconductivity.