Crystallographic features of the C-type orbital-ordered, and charge- and orbital-ordered states in the simple perovskite manganite Ca 1-xLa xMnO 3

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 Ca 1-xLa xMnO 3, 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 publicationMaterials Science Forum
    Pages1612-1617
    Number of pages6
    Volume706-709
    DOIs
    Publication statusPublished - 2012
    Event7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011 - Quebec City, QC
    Duration: 2011 Aug 12011 Aug 5

    Publication series

    NameMaterials Science Forum
    Volume706-709
    ISSN (Print)02555476

    Other

    Other7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
    CityQuebec City, QC
    Period11/8/111/8/5

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    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
    • Mechanical Engineering
    • Mechanics of Materials

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