Features of structural fluctuations in superconducting oxides Ln{single bond}Ce{single bond}Cu{single bond}O (Ln {double bond, long} Pr, Nd)

Hideya Furusawa, Yasumasa Koyama

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    Features of both crystal structures and structural fluctuations in superconducting oxides, Ln2-xCexCuO4-y (Ln {double bond, long} Pr, Nd) with 0 ≤ x ≤ 0.20, have been examined in detail by means of electron diffraction. In electron diffraction patterns of Ln2-xCexCuO4-y (Ln = Pr, Nd), there commonly exists characteristic diffuse scattering in addition to fundamental spots due to the T′-structure. The diffuse scattering is observed as a spike shape along the <110> directions around the fundamental spot. Because of no temperature dependence of the intensity of the scattering, the scattering is understood to be mainly due to static displacements of atoms. In addition, the electron-beam irradiation results in two effects in diffraction patterns. One is characterized by the appearance of superlattice spots in both Nd2-xCexCuO4-y and Pr2-xCexCuO4-y. That is, the irradiation produces the modulated structure due to the ordering of oxygen vacancies. The other is the splitting of the fundamental spot in Pr2-xCexCuO4-y, which is due to a twinning resulting from a structural transition.

    Original languageEnglish
    Pages (from-to)131-133
    Number of pages3
    JournalPhysica C: Superconductivity and its Applications
    Volume190
    Issue number1-2
    DOIs
    Publication statusPublished - 1991 Dec 2

    Fingerprint

    Oxides
    Scattering
    oxides
    scattering
    Electron diffraction
    Diffraction patterns
    diffraction patterns
    electron diffraction
    Irradiation
    irradiation
    Twinning
    Oxygen vacancies
    twinning
    spikes
    Electron beams
    Crystal structure
    electron beams
    Atoms
    temperature dependence
    crystal structure

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

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    title = "Features of structural fluctuations in superconducting oxides Ln{single bond}Ce{single bond}Cu{single bond}O (Ln {double bond, long} Pr, Nd)",
    abstract = "Features of both crystal structures and structural fluctuations in superconducting oxides, Ln2-xCexCuO4-y (Ln {double bond, long} Pr, Nd) with 0 ≤ x ≤ 0.20, have been examined in detail by means of electron diffraction. In electron diffraction patterns of Ln2-xCexCuO4-y (Ln = Pr, Nd), there commonly exists characteristic diffuse scattering in addition to fundamental spots due to the T′-structure. The diffuse scattering is observed as a spike shape along the <110> directions around the fundamental spot. Because of no temperature dependence of the intensity of the scattering, the scattering is understood to be mainly due to static displacements of atoms. In addition, the electron-beam irradiation results in two effects in diffraction patterns. One is characterized by the appearance of superlattice spots in both Nd2-xCexCuO4-y and Pr2-xCexCuO4-y. That is, the irradiation produces the modulated structure due to the ordering of oxygen vacancies. The other is the splitting of the fundamental spot in Pr2-xCexCuO4-y, which is due to a twinning resulting from a structural transition.",
    author = "Hideya Furusawa and Yasumasa Koyama",
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    T1 - Features of structural fluctuations in superconducting oxides Ln{single bond}Ce{single bond}Cu{single bond}O (Ln {double bond, long} Pr, Nd)

    AU - Furusawa, Hideya

    AU - Koyama, Yasumasa

    PY - 1991/12/2

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    N2 - Features of both crystal structures and structural fluctuations in superconducting oxides, Ln2-xCexCuO4-y (Ln {double bond, long} Pr, Nd) with 0 ≤ x ≤ 0.20, have been examined in detail by means of electron diffraction. In electron diffraction patterns of Ln2-xCexCuO4-y (Ln = Pr, Nd), there commonly exists characteristic diffuse scattering in addition to fundamental spots due to the T′-structure. The diffuse scattering is observed as a spike shape along the <110> directions around the fundamental spot. Because of no temperature dependence of the intensity of the scattering, the scattering is understood to be mainly due to static displacements of atoms. In addition, the electron-beam irradiation results in two effects in diffraction patterns. One is characterized by the appearance of superlattice spots in both Nd2-xCexCuO4-y and Pr2-xCexCuO4-y. That is, the irradiation produces the modulated structure due to the ordering of oxygen vacancies. The other is the splitting of the fundamental spot in Pr2-xCexCuO4-y, which is due to a twinning resulting from a structural transition.

    AB - Features of both crystal structures and structural fluctuations in superconducting oxides, Ln2-xCexCuO4-y (Ln {double bond, long} Pr, Nd) with 0 ≤ x ≤ 0.20, have been examined in detail by means of electron diffraction. In electron diffraction patterns of Ln2-xCexCuO4-y (Ln = Pr, Nd), there commonly exists characteristic diffuse scattering in addition to fundamental spots due to the T′-structure. The diffuse scattering is observed as a spike shape along the <110> directions around the fundamental spot. Because of no temperature dependence of the intensity of the scattering, the scattering is understood to be mainly due to static displacements of atoms. In addition, the electron-beam irradiation results in two effects in diffraction patterns. One is characterized by the appearance of superlattice spots in both Nd2-xCexCuO4-y and Pr2-xCexCuO4-y. That is, the irradiation produces the modulated structure due to the ordering of oxygen vacancies. The other is the splitting of the fundamental spot in Pr2-xCexCuO4-y, which is due to a twinning resulting from a structural transition.

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