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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. Litterst71Technische 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 ReO1−xFxFeAs and (Sr,Eu)Fe2−xCoxAs2 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 ReO1−xFxFeAs. 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

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