Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Postersession Superconductivity: Materials - Fabrication and Properties
TT 5.32: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Magnetism, structure, thermodynamics and transport of RO1−xFxFeAs (R=La, Ce, Sm, Gd) superconductors — J. E. Hamann-Borrero1, A. Kondrat1, N. Leps1, L. Wang1, A. Alfonsov1, F. Hammerath1, A. Narduzzo1, H. Grafe1, G. Lang1, D. Paar1, J. Werner1, G. Behr1, V. Kataev1, •C. Hess1, R. Klingeler1, B. Büchner1, H. Luetkens2, H.-H. Klauss3, S. Kimber4, R. Feyerherm4, D. Argyriou4, M. Kosmala5, O. Schumann5, and M. Braden5 — 1Leibniz-Institute for Solid State and Materials Research, IFW Dresden, 01171 Dresden, Germany — 2Laboratory for Muon-Spin Spectroscopy, PSI, CH-5232 Villigen, Switzerland — 3Institut für Festkörperphysik, TU Dresden, D-01069 Dresden, Germany — 4Helmholtz-Zentrum Berlin für Materialien und Energie (HZB), 14109 Berlin, Germany — 5II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
We discuss magnetism, structure, thermodynamics and transport properties of the new oxypnictide superconductors RO1−xFxFeAs (R=La, Ce, Sm, Gd). At zero fluorine doping we observe a close link between electronic, structural and magnetic degrees of freedom at the structural and the magnetic phase transitions TS≈ 160 K and TN≈ 138 K. F-doping leads to the suppression of these transitions and the emergence of superconductivity. The superconducting doping levels exhibits an interesting interplay between magnetism and superconductivity. We discuss the influence of different R-ions on the physical properties.