Superconducting Properties in LTG-Sm1+xBa2-xCu3Oy+Low-Tc Nanoparticle Films under Low Temperature and High Magnetic Field

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  • MIURA Masashi
    Dept. of Electrical Engineering and Computer Science, Nagoya University CREST-Japan Science and Technology Agency
  • YOSHIDA Yutaka
    Dept. of Electrical Engineering and Computer Science, Nagoya University CREST-Japan Science and Technology Agency
  • OZAKI Toshinori
    Dept. of Electrical Engineering and Computer Science, Nagoya University CREST-Japan Science and Technology Agency
  • ICHINO Yusuke
    Dept. of Electrical Engineering and Computer Science, Nagoya University CREST-Japan Science and Technology Agency
  • MUTOH Masakazu
    Dept. of Electrical Engineering and Computer Science, Nagoya University CREST-Japan Science and Technology Agency
  • TAKAI Yoshiaki
    Dept. of Electrical Engineering and Computer Science, Nagoya University
  • MATSUMOTO Kaname
    Dept. of Materials Science, Kyoto University CREST-Japan Science and Technology Agency
  • ICHINOSE Ataru
    Electric Power Engineering Research Lab., Central Research Institute of Electric Power Industry CREST-Japan Science and Technology Agency
  • HORII Shigeru
    Dept. of Applied chemistry, University of Tokyo CREST-Japan Science and Technology Agency
  • MUKAIDA Masashi
    Dept. of Materials Science and Engineering, Kyushu University CREST-Japan Science and Technology Agency
  • AWAJI Satoshi
    High Field Laboratory for Superconducting Materials, IMR, Tohoku University
  • WATANABE Kazuo
    High Field Laboratory for Superconducting Materials, IMR, Tohoku University

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Other Title
  • ナノサイズ低Ｔｃ相導入Ｓｍ１＋ｘＢａ２‐ｘＣｕ３Ｏｙ薄膜の低温高磁場超伝導特性
  • ナノサイズ低Tc相導入Sm1+xBa2-xCu3Oy薄膜の低温高磁場超伝導特性
  • ナノサイズ テイTcソウ ドウニュウ Sm1 xBa2 xCu3Oy ハクマク ノ テイオン コウジバ チョウデンドウ トクセイ

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Abstract

We have reported high-Jc Sm1+xBa2-xCu3Oy (SmBCO) films prepared by a low-temperature growth (LTG) technique. The LTG-SmBCO films showed a Jc of 0.28 MA/cm2 (77 K, B//c, B=5 T). However, the Jc of these films in the magnetic fields above 5 T dropped and were lower than that of NbTi wire (4.2 K). In this study, we introduced nanoparticles with low Tc (low-Tc-nanoparticles) into LTG-SmBCO films to improve the Jc at the high magnetic field. The LTG-SmBCO + 1.4 vol.% nanoparticle film result in a Jc of 0.37 MA/cm2 (77 K, B//c, B = 5 T) and 0.10 MA/cm2 (77 K, B//c, B = 8 T). Furthermore, the Jc at 65 K in a field of 16 T (B//c) reached 0.05 MA/cm2. Elemental mapping clarified that LTG-SmBCO + 1.4 vol.% nanoparticle film had nanosized low-Tc particles with an x of 0.15-0.30 and low-Tc network with an x of 0.05-0.15, which were dispersed in the high-Tc matrix. We speculate that the Jc under high magnetic field conditions depends not only on the distribution and size of low-Tc regions, but also on the Sm/Ba composition within the low-Tc regions.

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