대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)

대한전기학회 (The Korean Institute of Electrical Engineers)
권호 표지

부가적인 Annealing이 Josephson weak-links를 통하여 Ceramic 고온초전도체 $YBa_2Cu_3O_{7-g}$ 에 미치는 영향

Effects of Additional Annealings via Josephson Weak-links on the Electrical Properties of Ceramic $YBa_2Cu_3O_{7-g}$

  • 정대영 (한국전기연구소 전기재료연구부 초전도연구실) ;
  • ;
  • ;
  • Jeong, D.Y. (Division of Electrical Materials, Korea Electrotechnology Research Institute) ;
  • Black, T.D. (Department of Physics, the Univ. of Texas at Arlington Arlington) ;
  • Krichene, S. (Department of Chemistry, the Univ. of Texas at Arlington Arlington) ;
  • Reynolds, J.R. (Department of Chemistry, the Univ. of Texas at Arlington Arlington)
  • 발행 : 1989.07.21
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초록

Single-phase $YBa_2Cu_3O_{j-g}$ (YBC) ceramic samples were annealed at $700^{\circ}C$ under a flowing $O_2$ atmosphere for 0, 18, 36, 54 and 72. hours after sintering. The resistivities(p) and the critical current densities($J_c$) of the samples were measured in a temperature range 77 to 300 K by a four probe method, using silver paint contacts. The variations of the electrical properties with annealing time are explained in terms of flux pinning, percolation probability and randomness, and alignment of grains and twins.The anomalous increases in $J_c$ and $T_c$ observed in sample annealed for a relatively long time possibly due to alignment of grains and twins, may imply the occurrence of superconducting glass state in high-$T_c$ superconducting ceramic.

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