Enhancement of flux-pinning in epitaxial Sm1+xBa 2-xCu3Oy films by introduction of low-T c nanoparticles

Masashi Miura, Yutaka Yoshida, Yusuke Ichino, Yoshiaki Tarai, Kaname Matsumoto, Ataru Ichinose, Shigeru Horii, Masashi Mukaida

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    Abstract

    Sm1+xBa2-xCu3Oy (SmBCO) films prepared by the low-temperature growth (LTG) technique showed a critical current density (Jc) as high as 0.28 MA/cm2 (77 K, B ∥ c,B = 5 T). However, Jc was lower than that of NbTi wire (4.2 K) above 5 T. In this study, we introduced nanoparticle superconductors with a low critical temperature (low-Tc) into LTG-SmBCO "LTG-SmBCO + nanoparticle" films to improve Jc under the high magnetic field, and obtained an extremely high Jc, 0.1 MA/cm2 (77 K, B ∥ c, B = 8 T). Energy-dispersive X-ray spectroscopy (EDX) showed that the "LTG-SmBCO + nanoparticle" films had a nanosize low-Tc phase and a low-Tc network dispersed in the high-Tc matrix. We concluded that the "LTG-SmBCO + nanoparticle" films could have enhanced Jc by the introduction of pinning centers and the improvement of irreversibility field (Bin).

    Original languageEnglish
    Pages (from-to)L11-L13
    JournalJapanese Journal of Applied Physics, Part 2: Letters
    Volume45
    Issue number1-3
    DOIs
    Publication statusPublished - Jan 31 2006

    All Science Journal Classification (ASJC) codes

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

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