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TT: Fachverband Tiefe Temperaturen
TT 8: Superconductivity: Fe-based Superconductors - 122 Part 1
TT 8.9: Talk
Monday, March 26, 2012, 17:15–17:30, H 2053
Microscopic interplay of superconducting and magnetic order parameters in ferropnictides — •H. Maeter1, T. Goltz1, J. Spehling1, H.-H. Klauss1, M. Bendele2, H. Luetkens2, R. Khasanov2, G. Pascua2, Z. Shermadini2, A. Amato2, S. Aswartham3, J. E. Hamann-Borrero3, A. Kondrat3, C. Hess3, A. Wolter3, S. Wurmehl3, G. Behr3, B. Büchner3, E. Wiesenmayer4, D. Johrendt4, H. Potts5, and B. Banusch5 — 1Institut für Festkörperphysik, TU Dresden, Germany — 2Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institut, Villigen, Switzerland — 3Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden,Germany — 4Department Chemie, Ludwig-Maximilians-Universität München, Germany — 5Swiss Nanoscience Institute, Universität Basel, Switzerland
We present results of µSR experiments of Ba1−xNaxFe2As2 that show a large coupling of the superconducting and magnetic order parameters. This is unexpected in light of the phase separation in Ba1−xKxFe2As2. However, in a µSR study of Ba1−xKxFe2As2 we unambiguously showed microscopic coexistence, even though there are many reports of phase separation in this system [1]. In FeSe1−x the interplay of phase separation and microscopic coexistence is also evident, here pressure can induce a change from microscopic coexistence to a combination of both [2]. In light of the µSR results it seems likely that phase separation and microscopic coexistence depend on the microscopic properties much more than on disorder.
Wiesenmayer et al., Phys. Rev. Lett. 107, 237001 (2011);
Bendele et al., Phys. Rev. Lett. 104, 087003 (2010).