The mechanism for the formation of α-axis phase in high-Jc Sm1+xBa2-xCu3Oy thick films prepared by low temperature growth technique

Masashi Miura, Yutaka Yoshida, Toshinori Ozaki, Yusuke Ichino, Yoshiaki Takai, Kaname Matsumoto, Ataru Ichinose, Shigeru Horii, Masashi Mukaida

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    Abstract

    REBa2Cu3Oy (REBCO) film is required for high-critical current (Ic) at 77 K, when using in power applications such as superconducting magnetic energy storage (SMES) and nuclear fusion. Generally, critical current density (Ic) of REBCO thick film decreases with increasing thickness of superconductor, because the amount of dead layer such as a-axis oriented phase increases with increasing the thickness. We speculated that the formation of α-axis oriented phase in REBCO thick films is owing to reduction of surface temperature. In this study, we fabricated low temperature growth (LTG)-multi Sm1.04Ba 1.96Cu3Oy, (SmBCO) thick films using a (Sm 1.04Ba1.96Cu3Oy/Sm-rich layer) × N (N= 1, 2⋯) multilayer system, to suppress the formation of α-axis oriented phases. The LTG-multi thick films retained a large terrace, as a result, supressing the reduction of surface temperature, even if the thickness of the films becomes thick. Therefore, LTG-multi thick films suppressed the formation of a-axis oriented phases and the films showed I c = 630 A/cm-width with a thickness of 1.35 μm at 77 K, From these results, we suggest that LTG-multilayer system is an effective technique for improving the critical current of coated conductor.

    Original languageEnglish
    Pages (from-to)999-1005
    Number of pages7
    JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    Volume71
    Issue number11
    DOIs
    Publication statusPublished - Nov 1 2007

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys
    • Materials Chemistry

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