Transverse and longitudinal lattice modulations in the charge-orbital- ordered manganite Sr 2-xLa xMnO 4 around x=0.5

Masazumi Arao, Yasuhide Inoue, Kensei Toyoda, Yasumasa Koyama

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    For Sr 2-xLa xMnO 4, having a nearly two-dimensional electronic system of e g electrons, we have examined the crystallographic features of the charge-orbital-ordered (COO) and charge-exchange (CE)-type magnetic states for 0.40 ≤ x ≤ 0.55 by transmission electron microscopy. Incommensurate and commensurate longitudinal lattice modulations were found below ∼150 K for 0.47 ≤ x ≤ 0.51, while the cooling from the disordered tetragonal state resulted in the appearance of transverse modulations below T COO for 0.40 ≤ x ≤ 0.52. For 0.47 ≤ x ≤ 0.51, thus, the longitudinal and transverse modulations were present in both the lower-temperature region of the COO state and the CE-type magnetic state. In addition to these two states, the COO state for 0.40 ≤ x < 0.47 and 0.51 < x ≤ 0.52 accompanies only the transverse modulation and should be referred to as the orbital modulated state without a charge modulation.

    Original languageEnglish
    Article number014102
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume84
    Issue number1
    DOIs
    Publication statusPublished - 2011 Jul 11

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    Modulation
    modulation
    orbitals
    charge exchange
    manganite
    Transmission electron microscopy
    Cooling
    cooling
    transmission electron microscopy
    Electrons
    electronics
    electrons
    Temperature

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Transverse and longitudinal lattice modulations in the charge-orbital- ordered manganite Sr 2-xLa xMnO 4 around x=0.5. / Arao, Masazumi; Inoue, Yasuhide; Toyoda, Kensei; Koyama, Yasumasa.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 84, No. 1, 014102, 11.07.2011.

    Research output: Contribution to journalArticle

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    AU - Arao, Masazumi

    AU - Inoue, Yasuhide

    AU - Toyoda, Kensei

    AU - Koyama, Yasumasa

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    N2 - For Sr 2-xLa xMnO 4, having a nearly two-dimensional electronic system of e g electrons, we have examined the crystallographic features of the charge-orbital-ordered (COO) and charge-exchange (CE)-type magnetic states for 0.40 ≤ x ≤ 0.55 by transmission electron microscopy. Incommensurate and commensurate longitudinal lattice modulations were found below ∼150 K for 0.47 ≤ x ≤ 0.51, while the cooling from the disordered tetragonal state resulted in the appearance of transverse modulations below T COO for 0.40 ≤ x ≤ 0.52. For 0.47 ≤ x ≤ 0.51, thus, the longitudinal and transverse modulations were present in both the lower-temperature region of the COO state and the CE-type magnetic state. In addition to these two states, the COO state for 0.40 ≤ x < 0.47 and 0.51 < x ≤ 0.52 accompanies only the transverse modulation and should be referred to as the orbital modulated state without a charge modulation.

    AB - For Sr 2-xLa xMnO 4, having a nearly two-dimensional electronic system of e g electrons, we have examined the crystallographic features of the charge-orbital-ordered (COO) and charge-exchange (CE)-type magnetic states for 0.40 ≤ x ≤ 0.55 by transmission electron microscopy. Incommensurate and commensurate longitudinal lattice modulations were found below ∼150 K for 0.47 ≤ x ≤ 0.51, while the cooling from the disordered tetragonal state resulted in the appearance of transverse modulations below T COO for 0.40 ≤ x ≤ 0.52. For 0.47 ≤ x ≤ 0.51, thus, the longitudinal and transverse modulations were present in both the lower-temperature region of the COO state and the CE-type magnetic state. In addition to these two states, the COO state for 0.40 ≤ x < 0.47 and 0.51 < x ≤ 0.52 accompanies only the transverse modulation and should be referred to as the orbital modulated state without a charge modulation.

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