Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: FS: Iron-Based Superconductors

TT 25.3: Topical Talk

Wednesday, March 24, 2010, 15:00–15:30, H20

Muon spin relaxation and Moessbauer studies of iron pnictide superconductors — •Hans-Henning Klauss¹, H. Maeter¹, T. Dellmann¹, H. Luetkens², R. Khasanov², A. Amato², Y. Pashkevich³, C. Hess⁴, R. Klingeler⁴, B. Büchner⁴, A. Leithe-Jasper⁵, H. Rosner⁵, C. Geibel⁵, W. Schnelle⁵, M. Braden⁶, and J. Litterst⁷ — ¹Technische Universität Dresden, Germany — ²PSI Villigen, Switzerland — ³Donetsk Phystech NASU, Ukraine — ⁴IFW Dresden, Germany — ⁵MPI-CPfS, Dresden, Germany — ⁶Universität Köln, Germany — ⁷Technische Universität Braunschweig, Germany

We have determined the electronic phase diagrams and order parameters of ReO_1−xF_xFeAs and (Sr,Eu)Fe_2−xCo_xAs₂ superconductors. The results prove an important role of the structural distortion for the SDW magnetism [1-3] and reveal two gap multiband superconductivity. We examined the interplay of iron and rare earth magnetic order in ReO_1−xF_xFeAs. The undoped compounds show different magnetic coupling strength 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 [4]. Finally, we present recent studies on (Ca,Sr,Ba,Eu)Fe₂As₂ [5] and (Fe₂As₂)(Sr₄T₂O₆)based pnictide superconductors.

[1] H. Luetkens, et al., Phys. Rev. Lett.,101, 2008

[2] H.-H. Klauss, et al., Phys. Rev. Lett., 101, 2008

[3] H. Luetkens, et al., Nature Materials, 8, 2009

[4] H. Maeter et al., Phys. Rev. B., 80, 2009

[5] R. Khasanov et al., Phys. Rev. Lett., 102, 2009