Structural transitions and related fluctuations in La1.875-xSmxSr0.125CuO4

Yasumasa Koyama, Y. Wakabayashi, S. I. Nakamura, Y. Inoue, K. Shinohara

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Features of both structural transitions and related fluctuations in La1.875-xSmxSr0.125CuO4 have been examined by means of electron diffraction in a temperature range between about 600 K and about 20 K. As the temperature is lowered, a structural phase transition from a high-temperature tetragonal (HTT) structure to a low-temperature orthorhombic (LTO) one takes place in 0≤x≤0.2 and HTT→LTO→Pccn→LTT successive transitions in 0.3≤x≤0.4 where the Pccn and low-temperature tetragonal (LTT) structures are characterized as a rotation of an oxygen octahedron about two 110 directions. An enhancement of a structural fluctuation in the LTO phase, which indicates a soft-phonon mode in the LTO-to-Pccn transition, occurs on cooling even in 0≤x≤0.2 as well as in 0.3≤x≤0.4. Because an increase in the Sm content results in two effects, a lowering of Tc and an enhancement of the structural fluctuation, the fluctuation is understood to suppress the superconductivity. Eventually, a dip in a composition dependence of Tc in La-Sr-Cu-O, which was experimentally found by Oda et al. [J. Phys. Soc. Jpn. 58, 1137 (1989)], is concluded to be due to the structural fluctuation related to the LTO-to-Pccn transition.

    Original languageEnglish
    Pages (from-to)9710-9716
    Number of pages7
    JournalPhysical Review B
    Volume48
    Issue number13
    DOIs
    Publication statusPublished - 1993

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    Temperature
    augmentation
    superconductivity
    electron diffraction
    cooling
    Superconductivity
    Electron diffraction
    temperature
    oxygen
    Phase transitions
    Oxygen
    Cooling
    Chemical analysis
    Direction compound

    ASJC Scopus subject areas

    • Condensed Matter Physics

    Cite this

    Koyama, Y., Wakabayashi, Y., Nakamura, S. I., Inoue, Y., & Shinohara, K. (1993). Structural transitions and related fluctuations in La1.875-xSmxSr0.125CuO4. Physical Review B, 48(13), 9710-9716. https://doi.org/10.1103/PhysRevB.48.9710

    Structural transitions and related fluctuations in La1.875-xSmxSr0.125CuO4. / Koyama, Yasumasa; Wakabayashi, Y.; Nakamura, S. I.; Inoue, Y.; Shinohara, K.

    In: Physical Review B, Vol. 48, No. 13, 1993, p. 9710-9716.

    Research output: Contribution to journalArticle

    Koyama, Y, Wakabayashi, Y, Nakamura, SI, Inoue, Y & Shinohara, K 1993, 'Structural transitions and related fluctuations in La1.875-xSmxSr0.125CuO4', Physical Review B, vol. 48, no. 13, pp. 9710-9716. https://doi.org/10.1103/PhysRevB.48.9710
    Koyama, Yasumasa ; Wakabayashi, Y. ; Nakamura, S. I. ; Inoue, Y. ; Shinohara, K. / Structural transitions and related fluctuations in La1.875-xSmxSr0.125CuO4. In: Physical Review B. 1993 ; Vol. 48, No. 13. pp. 9710-9716.
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