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Magnetismus Poster: Do., 13:00–15:30 D-P258 Magnetismus in 214-Ruthenaten Paul Steffens 1 , Olaf Schumann 1 , Peter Link 2 , Yvan Sidis 3 , Wolfgang Schmidt 4 , Jiri Kulda 4 , Satoru Nakatsuji 5 , Yoshiteru Maeno 5 , Markus Braden 1 1 II. Physikalisches Institut, Universität Köln, Zülpicher Straße 77, 50937 Köln – 2 FRM- II, Technische Universität München, Lichtenbergstr. 1, 85747 Garching – 3 Laboratoire Léon Brillouin, F-91191 Gif-sur-Yvette Cedex, France – 4 Institut Laue Langevin, Rue Jules Horowitz, F-34802 Grenoble Cedex, France – 5 Department of Physics, Kyoto University, Kyoto 606-8502, Japan Die einfach geschichteten Ruthenate Ca2−xSrxRuO4 zeichnen sich durch vielfältige interessante Eigenschaften aus: durch isovalente Ersetzung von Sr durch Ca geht aus dem unkonventionellen (Spin-Triplet-) Supraleiter Sr2RuO4 der Mott-Isolator Ca2RuO4 hervor. Dazwischen ergibt sich ein Phasendiagramm, das Bereiche sehr verschiedenen strukturellen, elektronischen und magnetischen Verhaltens vereint. Dabei exisitiert in den metallischen Phasen, die den großen Bereich 0.2
Magnetismus Poster: Do., 13:00–15:30 D-P259 Investigation of Orbital and Magnetic Order in Ruthenates with Resonant X-Ray Diffraction J. Strempfer 1 , I. Zegkinoglou 1 , B. Bohnenbuck 1 , C.S. Nelson 2 , J.P. Hill 3 , J.C. Lang 4 , G. Srajer 4 , Y. Maeno 5 , C.T. Lin 1 , B. Keimer 1 1 MPI/FKF, Heisenbergstr. 1, 70569 Stuttgart – 2 NSLS/BNL, Upton, NY 11973, USA – 3 Department of Physics, BNL, Upton, NY 11973, USA – 4 APS/ANL, Argonne, IL 60439, USA – 5 Department of Physics, Kyoto University, Kyoto 606-8501, Japan Magnetic and orbital order in the 4d electron systems Ca2−xSrxRuO4 and RuSr2GdCu2O8 were investigated by resonant x-ray diffraction at the Ru LII and LIII absorption edges from single-crystals. A large resonance enhancement of the scattered signal is observed which is due to electric dipole transitions directly into the partly occupied 4d band. The Ca2−xSrxRuO4 compounds exhibit a rich phase diagram reaching from Sr2RuO4, the only known non-cuprate layered perovskite with superconducting properties (Tc = 1.5 K) to Ca2RuO4, an antiferromagnetically ordered Mott insulator (TN = 110 K), with an active orbital degree of freedom. Our investigations of Ca2RuO4 revealed the existence of an orbitally ordered phase with a phase transition temperature of about 260 K [1], which lies well above the antiferromagnetic transition. The propagation vector of the orbitally ordered phase is the same as the one in the low-temperature antiferromagnetic state. The orbital order phase transition is observed also in the x=0.1 Sr-doped compound with a lower critical temperature. The ruthenocuprate system RuSr2GdCu2O8 is known for exhibiting both long-range magnetic order of the Ru magnetic moments (TN = 136 K) and superconductivity (Tc ≈ 35 K). Our investigations on a small single crystal allowed the precise determination of the direction of its magnetic moment from the azimuthal dependence of the magnetic scattering intensity. The moment direction was found to differ significantly from the (001) direction, revising conclusions drawn from powder neutron diffraction results. Finally, a possible interaction between the magnetic order and the onset of superconductivity was also investigated. [1] I. Zegkinoglou, J. Strempfer et al., Phys. Rev. Lett. 95 (2005) 136401
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Index Autoren und ihre Beiträge: u
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Index M-P98, M-P100, M-P101, M-P195
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Index Deák, L. D-P300 Decker, H. M
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Index Gavrila, G. D-P276 Gebhardt,
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Index Wochner, P. F-V68 Woiterski,
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