Abstract
The formation of the C-type orbital-ordered (COO) state from the disordered cubic (DC) state in Sr1−xNdxMnO3 (SNMO) with the simple perovskite structure has been examined mainly by transmission electron microscopy. As the COO state has tetragonal I4/mcm symmetry, its formation is associated with the cubic-to-tetragonal structural transition. It was found that, when SNMO samples were cooled down from the DC state, the R25-type rotational displacement of MnO6 octahedra was first induced, together with the symmetry change into the tetragonal I4/mcm structure. The C-type orbital ordering then appeared due to the induction of the Jahn–Teller distortion as a response of a lattice system to this orbital ordering. Because no symmetry change occurred in the latter case, the Jahn–Teller distortion can be regarded as a dilatational distortion. One interesting feature is that the appearance of the dilatational Jahn–Teller distortion led to a nanometer-scale banded structure, characterized by an alternating array of t...
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