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Features of the intermediate state appearing between the C- andA-type orbital-ordered states in the highly-correlated electronic systemSr1-x NdxMnO3

Published online by Cambridge University Press:  22 March 2016

Ayumi Shiratani ,
Hiroki Sato ,
Yasuhide Inoue  and
Yasumasa Koyama
Ayumi Shiratani*
Affiliation:
Department of Electronic and Physical Systems, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
Hiroki Sato
Affiliation:
Department of Electronic and Physical Systems, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
Yasuhide Inoue
Affiliation:
Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, 2-8-26, Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan
Yasumasa Koyama
Affiliation:
Department of Electronic and Physical Systems, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, 2-8-26, Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan
*
*(Email: white-v@suou.waseda.jp)
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Abstract

The presence of the C- and A-type orbital-ordered states has been reported in thehighly-correlated electronic systemSr1-xNdxMnO3 (SNMO). The interesting feature ofthe oxide system is that an increase in the Nd content leads to the (C-type→ A-type) state change across a temperature-independent morphotropicphase boundary (MPB). Although structural fluctuations can be expected near theMPB, the detailed features of the state change have not been understoodsufficiently. Thus, the crystallographic features of the state change in SNMOwith 0.35 ≤ x ≤ 0.49 have been investigated mainly at 300K, by x-ray powder diffraction and transmission electron microscopy. It wasfound that the C-type orbital-ordered state with the tetragonal-I4/mcm symmetryand 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 regionswith the cubic-Pm $\bar 3$ m symmetry were also found locally for x= 0.43, in addition to the C-type state. Because therotational-displacement pattern for oxygen octahedra involved in thedisordered-Imma state is the same as that in the A-type state, furthermore, theformer disordered state may be regarded as a precursor state to the A-typeorbital ordering.

Keywords

transmission electron microscopy (TEM)oxidecrystallographic structure

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Type
Articles
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MRS Advances , Volume 1 , Issue 9: Electronics and Photonics , 2016 , pp. 603 - 608
Copyright
Copyright © Materials Research Society 2016 

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References

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