Possible orbital-ordered state in the highly-correlated electronic material Sr1-xCexMnO3

Takehiro Hanaoka, Yasuhide Inoue, Yasumasa Koyama

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

Abstract

The simple perovskite manganite Sr1-xCexMnO3 (SCMO) has a highly-correlated electronic system with a three-dimensional character. Because the presence of orbital-ordered states of eg electrons can be expected in SCMO, the crystallographic features of SCMO samples with 0.09 ≤ x ≤ 0.20 have been investigated mainly by transmission electron microscopy. In addition to fundamental reflections due to the simple perovskite structure, their electron diffraction patterns at room temperature exhibited both the presence of superlattice reflections at in the cubic notation and the splitting of fundamental and superlattice reflections. The careful analysis of these reflections indicated that the superlattice reflections originated from the R25-type rotational displacement of oxygen octahedra about one of the <100>c directions. On the other hand, the splitting of the reflections was found to be due to a {110}c banded structure consisting of two tetragonal bands with different c/a values. Because one of two tetragonal bands had the c/a value of about 1.028, the splitting reflects the introduction of the Jahn-Teller distortion as a response of a lattice system to orbital ordering. It is thus understood that the C-type orbital ordering of eg electrons should be involved in the state at room temperature for 0.09 ≤ x ≤ 0.20 in SCMO.

Original languageEnglish
Title of host publicationTHERMEC 2013 Supplement
PublisherTrans Tech Publications
Pages230-236
Number of pages7
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

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Keywords

  • C-type orbital ordering
  • Jahn-teller distortion
  • Rotational displacement of oxygen octahedra
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Hanaoka, T., Inoue, Y., & Koyama, Y. (2014). Possible orbital-ordered state in the highly-correlated electronic material Sr1-xCexMnO3. In THERMEC 2013 Supplement (pp. 230-236). (Advanced Materials Research; Vol. 922). Trans Tech Publications. https://doi.org/10.4028/www.scientific.net/AMR.922.230