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Octahedral tilts and electronic correlations in La7/8Sr1/8MnO3

J. Geck, P. Wochner, S. Kiele, P. Reutler, A. Revcolevschi, B. Büchner

cond-mat.str-elarXiv:cond-mat/0603226

Abstract

We present a resonant x-ray scattering study of the octahedral tilt order between 50K and 310K in La7/8Sr1/8MnO3. At the La LII-edge the resonant (300) reflection probes cooperative tilts of the MnO6-octahedra in this material, as verified by a model caclulation as well as a LDA+U study. The investigation of the octahedral tilts as a function of temperature and the comparison to the lattice parameters, the magnetization and the superlattice reflections related to charge and/or orbital order reveal an intimate coupling between electronic and tilt degrees of freedom in La7/8Sr1/8MnO3.

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