Formation of the C-type Orbital-Ordered State in the Simple Perovskite Manganite Sr1-xSmxMnO3

Misato Yamagata, Ayumi Shiratani, Yasuhide Inoue, Yasumasa Koyama

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    The simple perovskite manganite Sr1-xSmxMnO3 (SSMO) has been reported to have a highly-correlated electronic system for e g-electrons in a Mn ion. According to the previous studies, the C-type orbital-ordered (COO) state with the I4/mcm symmetry was found to be formed from the disordered-cubic (DC) state on cooling. The feature of the COO state is that its crystal structure involves both the Jahn-Teller distortion to orbital ordering and the R 25-type rotational displacement of oxygen octahedra. Because of the involvement of both the distortion and the displacement, their competition should be expected in the formation of the COO state. However, the detailed features of the competition have not been understood yet. Thus, the crystallographic features of the COO state in SSMO have been examined by x-ray powder diffraction and transmission electron microscopy. It was found that, when the Sm content increased from x = 0 at room temperature, the DC state changed into the COO state with the tetragonal symmetry around x = 0.13. The notable feature of the COO state is that the state is characterized by a nanometer-scaled banded structure consisting of an alternating array of two tetragonal bands. One tetragonal band consisted of the COO state involving both the Jahn-Teller distortion and the R 25-type rotational displacement. But, there was only the latter displacement in the other, the state of which could be identified as a disordered tetragonal (DT) state. Based on this, it is understood that the COO-state formation from the DC state should take place via the appearance of the DT state, which may involve fluctuations of the C-type orbital ordering.

    Original languageEnglish
    Pages (from-to)615-620
    Number of pages6
    JournalMRS Advances
    Volume1
    Issue number9
    DOIs
    Publication statusPublished - 2016 Jan 1

    Fingerprint

    Jahn-Teller effect
    Perovskite
    orbitals
    Crystal structure
    Ions
    Oxygen
    Transmission electron microscopy
    Cooling
    X rays
    Electrons
    Temperature
    manganite
    perovskite
    symmetry
    Powder Diffraction
    cooling

    Keywords

    • crystallographic structure
    • oxide
    • transmission electron microscopy (TEM)

    ASJC Scopus subject areas

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

    Cite this

    Formation of the C-type Orbital-Ordered State in the Simple Perovskite Manganite Sr1-xSmxMnO3 . / Yamagata, Misato; Shiratani, Ayumi; Inoue, Yasuhide; Koyama, Yasumasa.

    In: MRS Advances, Vol. 1, No. 9, 01.01.2016, p. 615-620.

    Research output: Contribution to journalArticle

    Yamagata, Misato ; Shiratani, Ayumi ; Inoue, Yasuhide ; Koyama, Yasumasa. / Formation of the C-type Orbital-Ordered State in the Simple Perovskite Manganite Sr1-xSmxMnO3 In: MRS Advances. 2016 ; Vol. 1, No. 9. pp. 615-620.
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    abstract = "The simple perovskite manganite Sr1-xSmxMnO3 (SSMO) has been reported to have a highly-correlated electronic system for e g-electrons in a Mn ion. According to the previous studies, the C-type orbital-ordered (COO) state with the I4/mcm symmetry was found to be formed from the disordered-cubic (DC) state on cooling. The feature of the COO state is that its crystal structure involves both the Jahn-Teller distortion to orbital ordering and the R 25-type rotational displacement of oxygen octahedra. Because of the involvement of both the distortion and the displacement, their competition should be expected in the formation of the COO state. However, the detailed features of the competition have not been understood yet. Thus, the crystallographic features of the COO state in SSMO have been examined by x-ray powder diffraction and transmission electron microscopy. It was found that, when the Sm content increased from x = 0 at room temperature, the DC state changed into the COO state with the tetragonal symmetry around x = 0.13. The notable feature of the COO state is that the state is characterized by a nanometer-scaled banded structure consisting of an alternating array of two tetragonal bands. One tetragonal band consisted of the COO state involving both the Jahn-Teller distortion and the R 25-type rotational displacement. But, there was only the latter displacement in the other, the state of which could be identified as a disordered tetragonal (DT) state. Based on this, it is understood that the COO-state formation from the DC state should take place via the appearance of the DT state, which may involve fluctuations of the C-type orbital ordering.",
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