低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
研究論文
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
久保 勇人一野 祐亮吉田 隆吉積 正晃和泉 輝郎加藤 丈晴
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ジャーナル フリー

2013 年 48 巻 6 号 p. 304-308

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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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© 2013 公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)
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