Stability of the orbital-modulated state in the layered perovskite manganite Sr2-xRxMnO4 (R = Pr, Nd)

Yasuhide Inoue, Masazumi Arao, Go Shindo, Yasumasa Koyama

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

4 Citations (Scopus)

Abstract

To understand a stability of the orbital-modulated (OM) state in Sr 2-xRxMnO4 (R = Pr, Nd), the crystallographic features of oxide samples with 0.20 < x ≤ 0.50, prepared by the coprecipitation technique, have been investigated by transmission electron microscopy. When the Pr content x corresponding to the eg-electron concentration increased from x = 0, the OM state appeared in 0.20 < x ≤ 0.40 as a neighboring state of an orbital ordered (OO) state around x = 0.20. The interesting features are that around x = 0.44 there is a nanometer-sized coexisting state consisting of the OM and disordered tetragonal (DT) states, and that an average size of OM-state regions in the coexisting state decreases with increasing the eg-electron concentration. In addition, the so-called CE-type antiferromagnetic state found in Sr1.5La 0.5MnO4 is absent in the Nd and Pr cases. This suggests that the stability of the OM state is not directly associated with charge ordering of eg electrons, but basically due to only their orbital ordering.

Original languageEnglish
Title of host publicationTHERMEC 2009
Pages1760-1765
Number of pages6
DOIs
Publication statusPublished - 2010 Feb 10
Event6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009 - Berlin, Germany
Duration: 2009 Aug 252009 Aug 29

Publication series

NameMaterials Science Forum
Volume638-642
ISSN (Print)0255-5476

Conference

Conference6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009
CountryGermany
CityBerlin
Period09/8/2509/8/29

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Keywords

  • Layered perovskite
  • Manganite
  • Orbital modulation
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Inoue, Y., Arao, M., Shindo, G., & Koyama, Y. (2010). Stability of the orbital-modulated state in the layered perovskite manganite Sr2-xRxMnO4 (R = Pr, Nd). In THERMEC 2009 (pp. 1760-1765). (Materials Science Forum; Vol. 638-642). https://doi.org/10.4028/www.scientific.net/MSF.638-642.1760