Flux Pinning Properties in Low Magnetic Fields of YBa<sub>2</sub>Cu<sub>3</sub>O<i><sub>y</sub></i> Thin Films Doped with a Small Amount of BaHfO<sub>3 </sub>

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  • KUBO Hayato
    Dept. of Energy Engineering and Sience, Nagoya University
  • ICHINO Yusuke
    Dept. of Energy Engineering and Sience, Nagoya University
  • YOSHIDA Yutaka
    Dept. of Energy Engineering and Sience, Nagoya University
  • YOSHIZUMI Masateru
    Superconductivity Reserch Laboratory, International Superconductivity Technology Center
  • IZUMI Teruo
    Superconductivity Reserch Laboratory, International Superconductivity Technology Center
  • KATO Takeharu
    Japan Fine Ceramic Center

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Other Title
  • 微量のBaHfO<sub>3 </sub>を添加したYBa<sub>2</sub>Cu<sub>3</sub>O<i><sub>y </sub></i>薄膜の低磁場下における 磁束ピンニング特性
  • 微量のBaHfO₃を添加したYBa₂Cu₃Oy薄膜の低磁場下における磁束ピンニング特性
  • ビリョウ ノ BaHfO ₃ オ テンカ シタ YBa ₂ Cu ₃ Oy ハクマク ノ テイジバ カ ニ オケル ジソク ピンニング トクセイ
  • Flux Pinning Properties in Low Magnetic Fields of YBa2Cu3Oy Thin Films Doped with a Small Amount of BaHfO3

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Abstract

We focused on an improvement of Jc in low magnetic fields (including self-field) for applications to operations in low magnetic fields such as power cables and fault current limiters. We assumed that motion of the fluxes leads to a degradation of Jc even in low magnetic fields. In order to improve the Jc in low magnetic fields, we introduced a small amount of BHO as artificial pinning centers to YBCO thin films and evaluated the superconducting properties. We fabricated BHO-doped YBCO thin films on IBAD-MgO substrates using the pulsed laser deposition method and an excimer laser. The additive amount of BHO was in the range of 0.21 – 3.37 vol.%. The Tc of all the samples was approximately 88 K and this Tc was reduced approximately 1 K compared with the value for a pure-YBCO thin film. On the other hand, Jc at 77 K in the self-field (Jcself) of 0.42 vol.% BHOdoped samples was 5.76 MA/cm2. These values were higher than the Jcself (3.68 MA/cm2) of the pure-YBCO thin film. In addition, increasing Jcself improved the Jc in low magnetic fields below 1 T.

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