Structural transitions in the superconducting oxides Ba-Pb-Bi-O

Yasumasa Koyama, M. Ishimaru

    Research output: Contribution to journalArticle

    23 Citations (Scopus)

    Abstract

    The crystal structures at room temperature and the structural transitions in BaPb1-xBixO3 (Ba-Pb-Bi-O) have been investigated in detail by means of electron diffraction. From an analysis of the crystal structures on the basis of electron diffraction patterns obtained experimentally, it is shown that, as the temperature is lowered, Ba-Pb-Bi-O undergoes a cubic-to-tetragonal transition resulting from the condensation of the triply degenerate R25 mode, R25x, in the lower-Bi-content range 0x<0.35, and successive transitions from the cubic to the tetragonal and to a monoclinic structure in the intermediate-Bi-content range 0.35<x<0.90. In the successive transitions, the cubic-to-tetragonal transition is understood to be due to the first condensation of the R25 mode, R25x, and the tetragonal-to-monoclinic transition is due to the second condensation of the R25 mode, R25y. The soft-phonon-mode behavior of the R25 mode in the cubic and tetragonal phases was actually detected as a change in an intensity of diffuse scattering appearing at the R point in the first Brillouin zone of the cubic perovskite structure. In addition, the crystal structure at room temperature in the higher-Bi-content range 0.90<1.00 is confirmed to involve the breathing displacements resulting from the appearance of charge-density waves as well as the R25x+R25y displacements. Moreover, a simple explanation of the physical origin of the superconductivity in Ba-Pb-Bi-O is presented on the basis of the present experimental results.

    Original languageEnglish
    Pages (from-to)9966-9975
    Number of pages10
    JournalPhysical Review B
    Volume45
    Issue number17
    DOIs
    Publication statusPublished - 1992

    Fingerprint

    Oxides
    Condensation
    Crystal structure
    Electron diffraction
    oxides
    Charge density waves
    condensation
    Superconductivity
    Perovskite
    Temperature
    Diffraction patterns
    crystal structure
    electron diffraction
    Scattering
    room temperature
    breathing
    Brillouin zones
    diffraction patterns
    superconductivity
    scattering

    ASJC Scopus subject areas

    • Condensed Matter Physics

    Cite this

    Structural transitions in the superconducting oxides Ba-Pb-Bi-O. / Koyama, Yasumasa; Ishimaru, M.

    In: Physical Review B, Vol. 45, No. 17, 1992, p. 9966-9975.

    Research output: Contribution to journalArticle

    Koyama, Yasumasa ; Ishimaru, M. / Structural transitions in the superconducting oxides Ba-Pb-Bi-O. In: Physical Review B. 1992 ; Vol. 45, No. 17. pp. 9966-9975.
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