Crystallographic features of the C-type orbital-ordered, and charge- and orbital-ordered states in the simple perovskite manganite Ca 1-xLaxMnO3

Yasuhide Inoue, Masazumi Arao, Daisuke Shiga, Yasumasa Koyama

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

Abstract

The C-type orbital-ordered (CTOO), and charge- and orbital-ordered (COO) states are present in the simple perovskite manganite Ca1-xLa xMnO3, which has a three-dimensional highly-correlated electronic system. In this study, the crystallographic features of the CTOO and COO states have been investigated mainly by transmission electron microscopy to understand responses of a lattice system to these orderings. Of these two states, the cooling from the disordered orthorhombic Pnma (DO) state around x = 0.20 resulted in the CTOO state with the monoclinic P21/m symmetry. As a result of the monoclinic distortion as a response of the lattice system, the CTOO state consisted of a banded structure that was characterized by an alternating array of two monoclinic domains with different β values. In 0.30 < x < 0.50, on the other hand, the appearance of the COO state from the DO state on cooling accompanied a transverse lattice modulation with q = [ 0 0ζ]DO as a response to orbital ordering in the COO state. The subsequent cooling in the COO state led to the antiferromagnetic ordering with a large lattice dilatation. In other words, no change in the crystal symmetry occurs in the appearance of the antiferromagnetic ordering.

Original languageEnglish
Title of host publicationTHERMEC 2011
PublisherTrans Tech Publications Ltd
Pages1612-1617
Number of pages6
ISBN (Print)9783037853030
DOIs
Publication statusPublished - 2012 Jan 1
Event7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011 - Quebec City, QC, Canada
Duration: 2011 Aug 12011 Aug 5

Publication series

NameMaterials Science Forum
Volume706-709
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
CountryCanada
CityQuebec City, QC
Period11/8/111/8/5

Keywords

  • Charge- and orbital-ordered state
  • Manganite
  • Orbital-ordered state
  • Simple perovskite
  • Transmission electron microscopy

ASJC Scopus subject areas

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

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