Evolution of orthorhombic domain structures during the tetragonal-to- orthorhombic phase transition in the layered perovskite Sr2-x Lax Mn O4

Wataru Norimatsu, Yasumasa Koyama

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    18 Citations (Scopus)

    Abstract

    When Sr2+ ions in Sr2 Mn O4 containing only Mn4+ ions were partially replaced by La3+, a new phase having orthorhombic symmetry appeared around an La content of x=0.15 between the tetragonal I4/mmm (T) phase and the charge and orbital ordered (COO) phase, accompanying the introduction of Mn3+ ions. Our in situ observation using a transmission electron microscope revealed that the orthorhombic (O) phase could be identified as an orbital ordered state without charge ordering, and that its microstructure is characterized by an alternating array of two banded-shape variants with different orthorhombicities, OI and OII. It was also found that the T -to-O phase transition exhibited a unique evolution of domain structures, which resulted in the above-mentioned banded microstructure. In particular, the domain-structure evolution consisted of three steps: the appearance of the (T+ OI) and then the (OI + OII) coexisting states, followed by the annihilation of the interface between the OI and OII variants. The evidence suggests that this unique pattern of evolution is due to coupling between the short-wavelength Jahn-Teller (JT) distortion, associated with the Mn3+ ion, and the long-wavelength O distortion.

    Original languageEnglish
    Article number085113
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume74
    Issue number8
    DOIs
    Publication statusPublished - 2006

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    Perovskite
    Phase transitions
    Ions
    ions
    Jahn-Teller effect
    orbitals
    Wavelength
    microstructure
    Microstructure
    wavelengths
    Electron microscopes
    electron microscopes
    perovskite
    symmetry

    ASJC Scopus subject areas

    • Condensed Matter Physics

    Cite this

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    title = "Evolution of orthorhombic domain structures during the tetragonal-to- orthorhombic phase transition in the layered perovskite Sr2-x Lax Mn O4",
    abstract = "When Sr2+ ions in Sr2 Mn O4 containing only Mn4+ ions were partially replaced by La3+, a new phase having orthorhombic symmetry appeared around an La content of x=0.15 between the tetragonal I4/mmm (T) phase and the charge and orbital ordered (COO) phase, accompanying the introduction of Mn3+ ions. Our in situ observation using a transmission electron microscope revealed that the orthorhombic (O) phase could be identified as an orbital ordered state without charge ordering, and that its microstructure is characterized by an alternating array of two banded-shape variants with different orthorhombicities, OI and OII. It was also found that the T -to-O phase transition exhibited a unique evolution of domain structures, which resulted in the above-mentioned banded microstructure. In particular, the domain-structure evolution consisted of three steps: the appearance of the (T+ OI) and then the (OI + OII) coexisting states, followed by the annihilation of the interface between the OI and OII variants. The evidence suggests that this unique pattern of evolution is due to coupling between the short-wavelength Jahn-Teller (JT) distortion, associated with the Mn3+ ion, and the long-wavelength O distortion.",
    author = "Wataru Norimatsu and Yasumasa Koyama",
    year = "2006",
    doi = "10.1103/PhysRevB.74.085113",
    language = "English",
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    AU - Koyama, Yasumasa

    PY - 2006

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    AB - When Sr2+ ions in Sr2 Mn O4 containing only Mn4+ ions were partially replaced by La3+, a new phase having orthorhombic symmetry appeared around an La content of x=0.15 between the tetragonal I4/mmm (T) phase and the charge and orbital ordered (COO) phase, accompanying the introduction of Mn3+ ions. Our in situ observation using a transmission electron microscope revealed that the orthorhombic (O) phase could be identified as an orbital ordered state without charge ordering, and that its microstructure is characterized by an alternating array of two banded-shape variants with different orthorhombicities, OI and OII. It was also found that the T -to-O phase transition exhibited a unique evolution of domain structures, which resulted in the above-mentioned banded microstructure. In particular, the domain-structure evolution consisted of three steps: the appearance of the (T+ OI) and then the (OI + OII) coexisting states, followed by the annihilation of the interface between the OI and OII variants. The evidence suggests that this unique pattern of evolution is due to coupling between the short-wavelength Jahn-Teller (JT) distortion, associated with the Mn3+ ion, and the long-wavelength O distortion.

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