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Crystallographic features of orbital ordering related to the C-type antiferromagnetic state in the simple perovskite manganite Ca1-xPrxMnO3

Published online by Cambridge University Press:  24 February 2016

Kentaro Kojima*
Affiliation:
Department of Electronic and Physical system, 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 system, 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
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Abstract

In the highly-correlated electronic system Ca1-xPrxMnO3 having the simple perovskite structure, it has been reported that there exists the C-type orbital-ordered (COO) state accompanying an antiferromagnetic ordering for 0.10 ≤ x ≤ 0.25. According to the previous studies concerning orbital-ordered states in simple perovskite manganites, the COO state was understood to be characterized by a spatial array of (3z2-r2)-type orbitals for 3d electrons in Mn ions. The notable feature of the COO state in Ca1-xPrxMnO3 is that the state with the monoclinic-P21/m symmetry appears as a result of the structural transition from the disordered state with the orthorhombic-Pnma symmetry. Compared with the COO-state formation from the cubic-Pm$\overline 3$m state, however, the formation from the disordered-Pnma state has not been understood yet. We have thus examined the crystallographic features of the formation of the COO state in Ca1-xPrxMnO3, mainly by x-ray powder diffraction and transmission electron microscopy. In the case of x = 0.16, for instance, the COO state was found to appear from the disordered-Pnma state around 90 K on cooling. The notable feature of the formation is that, in the Pnma state just before the COO-state formation, characteristic diffuse scattering appeared around each reflection in electron diffraction patterns, together with the splitting of the 200c reflection in x-ray powder diffraction profiles in the pseudo-cubic notation. Based on these experimental data, it is understood that the formation of the COO state in Ca1-xPrxMnO3 accompanies remarkable fluctuations of the C-type orbital ordering in the disordered-Pnma state.

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Articles
Copyright
Copyright © Materials Research Society 2016 

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References

REFERENCES

Jin, S., Tiefel, T. H., McCormack, M., Fastnacht, R. A., Ramesh, R., and Chen, L. H., Science 264, 413 (1994).Google Scholar
Tokura, Y., Urushibara, A., Moritomo, Y., Arima, T., Asamitsu, A., Kido, G., and Furukawa, N., J. Phys. Soc. Jpn. 63, 3931 (1994).Google Scholar
Xiong, G. C., Li, Q., Ju, H. L., Mao, S. N., Senapati, L., Xi, X. X., Greene, R. L., and Venkatesan, T., Appl. Phys. Lett. 66, 1427 (1995).Google Scholar
Tokura, Y. and Nagaosa, N., Science 288, 462 (2000).Google Scholar
Dagotto, E., Hotta, T., and Moreo, A., Phys. Rep. 344, 1 (2001).CrossRefGoogle Scholar
Jirák, Z., Krupička, S., Šimša, Z., Dlouhá, M. and Vratislav, S., J. Magn. Magn. Mater. 53, 153 (1985).Google Scholar