低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
48 巻, 6 号
選択された号の論文の2件中1~2を表示しています
巻頭言
研究論文
  • 久保 勇人, 一野 祐亮, 吉田 隆, 吉積 正晃, 和泉 輝郎, 加藤 丈晴
    2013 年 48 巻 6 号 p. 304-308
    発行日: 2013/06/25
    公開日: 2013/07/03
    ジャーナル フリー
    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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