Regensburg 2002 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 22: Postersitzung III: Syst. korr. Elektr.: Theorie II (1-15), Metall-Isol.- und Phasenüberg
änge (16-33), SL: Massivmat., Bandl., Pinning, Vortexdyn., Transport, Korngr. (34-43), Niedrigdim. Syst., Magnetotransport (44-63)

TT 22.30: Poster

Donnerstag, 14. März 2002, 14:00–17:30, A

Resonant x-ray scattering study of structural distortions in La7/8Sr1/8MnO3 — •Jochen Geck1, Sven Kiele2, Pascal Reutler1, Bernd Büchner1, and Peter Wochner31II. Physikalisches Institut der RWTH Aachen — 2HASYLAB am DESY, Hamburg — 3Max-Planck-Institut für Metallforschung, Stuttgart

The study of the strong electronic correlations in doped transition metal oxides is one of the central issues of current condensed matter research. In this respect, lightly doped La1−xSrxMnO3 provides a particular illuminating example, displaying a great variety of intriguing ordering phenomena. Especially, the ferromagnetic insulating ground state of La1−xSrxMnO3 which develops around x=1/8 and its the microscopic structure remain to be fully understood. In order to clarify the microscopic properties of this possibly charge and orbital ordered state, we used resonant x-ray scattering (RXS) as a probe for occurring lattice distortions. The presented data shows that the crystal symmetry of La7/8Sr1/8MnO3 is neither orthorhombic in the collective Jahn-Teller-distorted phase below 280 K, nor in the ferromagnetic insulating phase below 150 K. Furthermore, our measurements point to the presence of substantial distortions of the MnO6-octahedra due to tilting, i.e. a non rigid rotation of the MnO6-octahedra. The gained structural information might be relevant for the understanding of the unusual physical properties of lightly doped La1−xSrxMnO3.

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