Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”
TT 24.54: Poster
Mittwoch, 10. März 2004, 14:30–19:00, Poster A
Orbital ordering in single-crystal and thin-film La7/8Sr1/8MnO3 — •Y. Su1, D. Wermeille2, O.H. Seeck1, A. Fattah1, J. Persson1, P. Foucart1, K. Istomin1, D. Hupfeld1, Th. Brueckel1, Zhi-Hong Wang3, G. Cristiani3, H.-U. Habermeier3, F. Wu4 und R.L. Johnson4 — 1Institut fuer Festkoerperforschung, Forschungszentrum Juelich GmbH, D-52425 Juelich, Germany — 2MuCAT, Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439, USA — 3Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany — 4II Institut fuer Experimentalphysik, Universitaet Hamburg, D-22761 Hamburg, Germany
The orbital ordering (OO) is believed to be a key ingredient for the metal-to-insulator transition in the ferromagnetic regime of lightly doped manganites. By utilising the resonant X-ray scattering (RXS) technique, a novel OO was identified in the ferromagnetic insulating (FI) regime of single-crystal La7/8Sr1/8MnO3. Meanwhile, Templeton scattering due to anisotropic structural effects was systematically measured at a set of forbidden Bragg reflections in the full temperature range, enabling us to quantitatively determine the atomic scattering tensor in both orbital ordered and disordered states. The complex structural phase transition and lattice modulations associated with this novel OO were also comprehensively examined by high-energy X-ray diffraction. A definite model on the OO in the FI regime will be proposed based on these new X-ray scattering results. In addition, latest results on the RXS investigations of orbital ordering and related structural modulation in thin-film La7/8Sr1/8MnO3 will also be presented