Improvement of Field-trapping Capability of High-Tc Bulk Superconductors using a Ba-Cu-O Substrate

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  • Ｂａ‐Ｃｕ‐Ｏ系酸化物支持材を用いた超電導バルク体の品質向上に関する研究
  • Ba-Cu-O系酸化物支持材を用いた超電導バルク体の品質向上に関する研究
  • Ba Cu Oケイ サンカブツ シジザイ オ モチイタ チョウデンドウ バルクタイ ノ ヒンシツ コウジョウ ニ カンスル ケンキュウ

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Abstract

We employed Ba-Cu-O substrates for the fabrication of bulk Nd-Ba-Cu-O superconductors using the top-seeded melt-growth method. There were several advantages for the use of Ba-Cu-O substrate compared to conventional substrate materials such as MgO, ZrO2, Al2O3, RE123 and RE211 (RE: rare earth). The Ba-Cu-O did not react with the precursor and minimized the loss of liquid. Accordingly, the introduction of large-sized cracks was suppressed. We also found that Tc values were high at the bottom regions, which was ascribed to the beneficial effect of Ba-Cu-O in suppressing Nd/Ba substitution. As a result, we could obtain bulk Nd-Ba-Cu-O superconductors that exhibit fairly good field-trapping capabilities even at the bottom surfaces.

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