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Features of the intermediate state appearing between the C- and A-type orbital-ordered states in the highly-correlated electronic system Sr1-xNdxMnO3
Published online by Cambridge University Press: 22 March 2016
Abstract
The presence of the C- and A-type orbital-ordered states has been reported in the
highly-correlated electronic system
Sr1-xNdxMnO3 (SNMO). The interesting feature of
the oxide system is that an increase in the Nd content leads to the (C-type
→ A-type) state change across a temperature-independent morphotropic
phase boundary (MPB). Although structural fluctuations can be expected near the
MPB, the detailed features of the state change have not been understood
sufficiently. Thus, the crystallographic features of the state change in SNMO
with 0.35 ≤ x ≤ 0.49 have been investigated mainly at 300
K, by x-ray powder diffraction and transmission electron microscopy. It was
found that the C-type orbital-ordered state with the tetragonal-I4/mcm symmetry
and the disordered orthorhombic-Imma state were present for 0.35 ≤ x
≤ 0.43 and for 0.45 ≤ x ≤ 0.49 at 300 K,
respectively. The notable feature of the state change is that disordered regions
with the cubic-Pm$\bar 3$ m symmetry were also found locally for x
= 0.43, in addition to the C-type state. Because the
rotational-displacement pattern for oxygen octahedra involved in the
disordered-Imma state is the same as that in the A-type state, furthermore, the
former disordered state may be regarded as a precursor state to the A-type
orbital ordering.
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- Copyright © Materials Research Society 2016
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