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Formation of the C-type Orbital-Ordered State in the Simple Perovskite Manganite Sr1-xSmxMnO3

Published online by Cambridge University Press:  22 March 2016

Misato Yamagata ,
Ayumi Shiratani ,
Yasuhide Inoue  and
Yasumasa Koyama
Misato Yamagata*
Affiliation:
Department of Electronic and Physical System, Waseda University, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
Ayumi Shiratani
Affiliation:
Department of Electronic and Physical System, Waseda University, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
Yasuhide Inoue
Affiliation:
Kagami Memorial Laboratory for Material Science and Technology, Waseda University, Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan
Yasumasa Koyama
Affiliation:
Department of Electronic and Physical System, Waseda University, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan Kagami Memorial Laboratory for Material Science and Technology, Waseda University, Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan
*
*(Email: misato0921@akane.waseda.jp)
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Abstract

The simple perovskite manganite Sr1-xSmxMnO3 (SSMO) has been reported to have a highly-correlated electronic system for eg-electrons in a Mn ion. According to the previous studies, the C-type orbital-ordered (COO) state with the I4/mcm symmetry was found to be formed from the disordered-cubic (DC) state on cooling. The feature of the COO state is that its crystal structure involves both the Jahn-Teller distortion to orbital ordering and the R25-type rotational displacement of oxygen octahedra. Because of the involvement of both the distortion and the displacement, their competition should be expected in the formation of the COO state. However, the detailed features of the competition have not been understood yet. Thus, the crystallographic features of the COO state in SSMO have been examined by x-ray powder diffraction and transmission electron microscopy. It was found that, when the Sm content increased from x = 0 at room temperature, the DC state changed into the COO state with the tetragonal symmetry around x = 0.13. The notable feature of the COO state is that the state is characterized by a nanometer-scaled banded structure consisting of an alternating array of two tetragonal bands. One tetragonal band consisted of the COO state involving both the Jahn-Teller distortion and the R25-type rotational displacement. But, there was only the latter displacement in the other, the state of which could be identified as a disordered tetragonal (DT) state. Based on this, it is understood that the COO-state formation from the DC state should take place via the appearance of the DT state, which may involve fluctuations of the C-type orbital ordering.

Keywords

transmission electron microscopy (TEM)oxidecrystallographic structure
Type
Articles
Information
MRS Advances , Volume 1 , Issue 9: Electronics and Photonics , 2016 , pp. 615 - 620
Copyright
Copyright © Materials Research Society 2016 

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References

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