Critical current density-magnetic field curve for untwinned orthorhombic Nd1+xBa2-xCu3O7±δ single crystal and its microstructure

Akihiro Oka, Satoshi Koyama, Teruo Izumi, Yuh Shiohara, Xiuliang Ma, Takahisa Yamamoto, Yuichi Ikuhara, Taketo Sakuma, Yoshihiro Sugawara, Tsukasa Hirayama

    Research output: Contribution to journalArticle

    Abstract

    Critical current density-magnetic field (Jc-H) curves with H ∥ c-axis for untwinned orthorhombic Nd1+xBa2-x.,Cu3O7±δ (Nd123, x = 0.07) single crystals were investigated. Untwinned single crystals were prepared by two different fabrication processes under uniaxial stress: a detwinning process and a twin-free process. The peak effects for twin-free crystals were larger than those for detwinned crystals. The results of evaluation of the Nd/Ba configurations in these single crystals by extended X-ray absorption fine structure (EXAFS) spectroscopy and transmission electron microscopy (TEM) suggested that a larger number of pinning centers of Nd-rich phases were distributed more finely in twin-free crystals, so that the peak effects in their JC-H curves increased. Furthermore, it is possible that the heat treatments under uniaxial stress affected the progress of Nd/Ba ratio fluctuation by means of the spinodal decomposition mechanism, which caused the fine distribution of Nd-rich phases in twin-free crystals. Nd123, JC-H curve, peak effect, EXAFS, TEM, spinodal decomposition

    Original languageEnglish
    Pages (from-to)6515-6522
    Number of pages8
    JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
    Volume39
    Issue number12 A
    DOIs
    Publication statusPublished - 2000 Dec 1

    ASJC Scopus subject areas

    • Engineering(all)
    • Physics and Astronomy(all)

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