Neutron diffraction of hole polaron ordering in La1-xSrxMnO3 (x ≃ 1/8)

The polaron-ordered structure of La1-xSrxMnO3 (x congruent to1/8) has been reinvestigated to verify the previously proposed models. We found satellite reflections on the (0,k,l)(ortho) and (1,k,l)(ortho) reciprocal planes. It has been shown that neither of the previously proposed models is completely consistent with the observed results. Based on theoretical consideration of interhole interactions in a perovskite-based structure, the experimental results are analyzed. A polaron ordered structure with unit cell size of (root 2x root 2x4)(cubic) has been proposed which is substantially consistent with the observed neutron-scattering pattern.