Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 39: SC: Iron-Based Superconductors - 1111

TT 39.6: Talk

Friday, March 26, 2010, 11:45–12:00, H19

Interplay of rare earth and FeAs magnetism in the iron pnictides GdOFeAs and CeOFeAs studied by muon spin relaxation and ⁵⁷Fe moessbauer spectroscopy — •N. Yèche¹, H.-H. Klauss¹, T. Dellmann¹, H. Luetkens², R. Khasanov², A. Amato², R. Klingeler³, B. Büchner³, and G. Behr³ — ¹Institut für Festkörperphysik, TU Dresden — ²Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland — ³Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden

ROFeAs with R = La, Ce, Pr, Sm, Gd are the magnetic mother compounds of the iron pnictide superconductors. We have investigated the magnetic properties and the interplay of iron and rare earth magnetic order in GdOFeAs by means of muon spin relaxation (µ⁺SR) and ⁵⁷Fe moessbauer spectroscopy and compare these to other undoped ROFeAs. We find that the Gd mother compound shows magnetic interaction between the rare earth and the FeAs layers similar to the Ce compound as allready reported in [1]. This results indicate that the rare-earth-FeAs electronic interaction is not crutial for the enhanced T_C in these systems.

[1] H. Maeter et al., Phys.Rev.B 80, 094524 (2009)