Characteristic features of the C-type orbital-ordered state in the simple perovskite manganite Sr1-xNdxMnO3

Hiroki Sato, Yasuhide Inoue, Yasumasa Koyama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the highly-correlated electronic system Sr1-x NdxMnO3, the C-type orbital-ordered (COO) state is present for 0.15<x<0.38, and its crystal structure with the tetragonal-I4/mcm symmetry involves both the R25-type rotational displacement of MnO6 octahedra and the Jahn-Teller distortion as a response of a lattice system to orbital ordering. To understand the details of the competition between the rotational displacement and the Jahn-Teller distortion, the formation of the COO state from the disordered cubic (DC) state with the space group Pm3m has been investigated mainly by transmission electron microscopy. It was found that, when the temperature was lowered from the DC state for x = 0.20, for instance, COO regions with the tetragonal symmetry, exhibiting a {110}DC banded structure, were locally formed in the matrix below about 330 K. The subsequent aging at 300 K resulted in the growth of COO regions; that is, the time-relaxation phenomenon. Because of the presence of antiphase boundaries for the rotational displacement in the matrix, the crystal structure of the matrix should also have the tetragonal symmetry. In other words, it is understood that the coexistence state appearing just after cooling from the DC state consists of two tetragonal regions with different c/a values. The coexistence state is apparently characteristic of the competition between the rotational displacement and the Jahn-Teller distortion for the formation of the COO state.

Original languageEnglish
Title of host publicationTHERMEC 2013 Supplement
PublisherTrans Tech Publications
Pages626-631
Number of pages6
ISBN (Print)9783038350743
DOIs
Publication statusPublished - 2014 Jan 1
Event8th International Conference on Processing and Manufacturing of Advanced Materials: Processing, Fabrication, Properties, Applications, THERMEC 2013 - Las Vegas, NV, United States
Duration: 2013 Dec 22013 Dec 6

Publication series

NameAdvanced Materials Research
Volume922
ISSN (Print)1022-6680

Conference

Conference8th International Conference on Processing and Manufacturing of Advanced Materials: Processing, Fabrication, Properties, Applications, THERMEC 2013
CountryUnited States
CityLas Vegas, NV
Period13/12/213/12/6

Keywords

  • C-type orbital ordering
  • Simple-perovskite manganite
  • Time-relaxation phenomenon
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Engineering(all)

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    Sato, H., Inoue, Y., & Koyama, Y. (2014). Characteristic features of the C-type orbital-ordered state in the simple perovskite manganite Sr1-xNdxMnO3. In THERMEC 2013 Supplement (pp. 626-631). (Advanced Materials Research; Vol. 922). Trans Tech Publications. https://doi.org/10.4028/www.scientific.net/AMR.922.626