酸化物高温超伝導体の単結晶育成と物性

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タイトル別名
  • Growth and Properties of High-T<SUB>c</SUB> Oxide-Superconductor Crystals
  • サンカブツ コウオン チョウデンドウタイ ノ タンケッショウ イクセイ ト ブ

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Crystal growth and physical properties of oxide superconductor YBa2Cu3Ox are reviewed. Flake crystals, which are obtained by a solution growth technique where excess CuO is used as a solvent, display a low temperature superconducting transition below 60K. On the other hand, block crystals, which are prepared using a solid-liquid reaction at peritectic temperature Tp, show a sharp transition above 90K in the as-grown state. A clear anisotropy in the upper critical field is observed in the block crystals. Twinning structures are also discussed in terms of a strain releasing model in the tetragonal-orthorhombic transformation near 600°C.

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