Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique

TT 16.15: Poster

Samstag, 5. März 2005, 11:00–16:30, Poster TU C

Electronic Phase Separation in La_1−xSr_xMnO₃ films, x 1/8. — •Peter Wochner¹, U. Gebhardt¹, A. Vigliante², N. Kasper¹, J. Geck³, H.U. Habermeier⁴, and F. Razavi⁵ — ¹MPI f. Metallforschung, Heisenbergstr. 3, 70569 Stuttgart — ²Bruker AXS GmbH, Karlsruhe — ³Leibniz-Institut für Festkörper- und Werkstoffforschung, Dresden — ⁴MPI f. Festkörperforschung, Stuttgart — ⁵Brock University, St. Catherines, Ontario, Canada

Recently, it was shown by J. Geck et al. that the low temperature ferromagnetic and insulating phase of bulk La_7/8Sr_1/8MnO₃ can be explained by an ordering of orbitals and holes in form of an orbital polaron lattice. Films of the same material on SrTiO₃ <001> oriented substrates show a metal-insulator transition for thicknesses smaller 500 A. Thicker films are insulators at low temperature. By synchrotron X-ray diffraction we found in these films one of the signatures of the orbital polaron (OP) phase which indicates the presence of half doped charge stripes together with a structural modulation. This OP phase is only short-range ordered and coexists with the antiferro-orbital ordered matrix.