Role of the tilting of oxygen octahedra in the stabilization of the orbital-modulated state in the layered perovskite manganite Ca2-xNdxMnO4

Yasuhide Inoue, Masazumi Arao, Ippei Tanaka, Yasumasa Koyama

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

    Abstract

    There exists the orbital-modulated (OM) state in the layered manganite Ca2-xNdxMnO4 (CNMO) with 0.20 ≤ x ≤ 0.50. To understand the effect of the tilting of MnO6 octahedra to the stability of the OM state, the crystallographic features of CNMO samples prepared by a solid-state reaction have been investigated mainly by transmission electron microscopy. For 0.30 ≤ x ≤ 0.50, it was found that the (LTO → Pccn/LTT) structural transition occurred on cooling from room temperature, where the LTO and Pccn/LTT structures are, respectively, characterized by tilting displacements of oxygen octahedra about one and two of the <110> directions. The notable feature of the (LTO → Pccn/LTT) transition is that its progress strongly suppresses the growth of the OM state for 0.30 ≤ x ≤ 0.45. As a result of the suppression, the OM state exhibits a re-entrant behavior for its appearance. This is an indication that the Pccn/LTT tilting is not favorable for the stabilization of the OM state.

    Original languageEnglish
    Title of host publicationMaterials Science Forum
    PublisherTrans Tech Publications Ltd
    Pages2065-2070
    Number of pages6
    Volume783-786
    ISBN (Print)9783038350736
    Publication statusPublished - 2014
    Event8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013 - Las Vegas, NV
    Duration: 2013 Dec 22013 Dec 6

    Publication series

    NameMaterials Science Forum
    Volume783-786
    ISSN (Print)02555476

    Other

    Other8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013
    CityLas Vegas, NV
    Period13/12/213/12/6

    Fingerprint

    Solid state reactions
    Perovskite
    Stabilization
    stabilization
    Oxygen
    Transmission electron microscopy
    Cooling
    orbitals
    oxygen
    Temperature
    indication
    Direction compound
    manganite
    perovskite
    retarding
    solid state
    cooling
    transmission electron microscopy
    room temperature

    Keywords

    • Orbital-modulated state
    • Tilting displacement of oxygen octahedra
    • Transmission electron microscopy

    ASJC Scopus subject areas

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

    Cite this

    Inoue, Y., Arao, M., Tanaka, I., & Koyama, Y. (2014). Role of the tilting of oxygen octahedra in the stabilization of the orbital-modulated state in the layered perovskite manganite Ca2-xNdxMnO4 In Materials Science Forum (Vol. 783-786, pp. 2065-2070). (Materials Science Forum; Vol. 783-786). Trans Tech Publications Ltd.

    Role of the tilting of oxygen octahedra in the stabilization of the orbital-modulated state in the layered perovskite manganite Ca2-xNdxMnO4 . / Inoue, Yasuhide; Arao, Masazumi; Tanaka, Ippei; Koyama, Yasumasa.

    Materials Science Forum. Vol. 783-786 Trans Tech Publications Ltd, 2014. p. 2065-2070 (Materials Science Forum; Vol. 783-786).

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

    Inoue, Y, Arao, M, Tanaka, I & Koyama, Y 2014, Role of the tilting of oxygen octahedra in the stabilization of the orbital-modulated state in the layered perovskite manganite Ca2-xNdxMnO4 in Materials Science Forum. vol. 783-786, Materials Science Forum, vol. 783-786, Trans Tech Publications Ltd, pp. 2065-2070, 8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013, Las Vegas, NV, 13/12/2.
    Inoue Y, Arao M, Tanaka I, Koyama Y. Role of the tilting of oxygen octahedra in the stabilization of the orbital-modulated state in the layered perovskite manganite Ca2-xNdxMnO4 In Materials Science Forum. Vol. 783-786. Trans Tech Publications Ltd. 2014. p. 2065-2070. (Materials Science Forum).
    Inoue, Yasuhide ; Arao, Masazumi ; Tanaka, Ippei ; Koyama, Yasumasa. / Role of the tilting of oxygen octahedra in the stabilization of the orbital-modulated state in the layered perovskite manganite Ca2-xNdxMnO4 Materials Science Forum. Vol. 783-786 Trans Tech Publications Ltd, 2014. pp. 2065-2070 (Materials Science Forum).
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    abstract = "There exists the orbital-modulated (OM) state in the layered manganite Ca2-xNdxMnO4 (CNMO) with 0.20 ≤ x ≤ 0.50. To understand the effect of the tilting of MnO6 octahedra to the stability of the OM state, the crystallographic features of CNMO samples prepared by a solid-state reaction have been investigated mainly by transmission electron microscopy. For 0.30 ≤ x ≤ 0.50, it was found that the (LTO → Pccn/LTT) structural transition occurred on cooling from room temperature, where the LTO and Pccn/LTT structures are, respectively, characterized by tilting displacements of oxygen octahedra about one and two of the <110> directions. The notable feature of the (LTO → Pccn/LTT) transition is that its progress strongly suppresses the growth of the OM state for 0.30 ≤ x ≤ 0.45. As a result of the suppression, the OM state exhibits a re-entrant behavior for its appearance. This is an indication that the Pccn/LTT tilting is not favorable for the stabilization of the OM state.",
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