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Y$Ba_2$$Cu_3$$O_{7-x}$ 후막의 고속 증착과 임계 전류 밀도의 두께 의존성
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  • Y$Ba_2$$Cu_3$$O_{7-x}$ 후막의 고속 증착과 임계 전류 밀도의 두께 의존성
  • High-rate growth $YBa_2$$Cu_3$$O_{7-x}$ thick films and thickness dependence of critical current density
저자명
조월렴,Jo. W.
간행물명
Progress in superconductivity
권/호정보
2004년|6권 1호|pp.13-18 (6 pages)
발행정보
한국초전도학회
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

High-.ate in-situ$ YBa_2$Cu$Cu_3$$O_{7-x}$ (YBCO) film growth was demonstrated by means of the electron beam co-evaporation. Even though our oxygen pressure is low, ∼$5 ${ imes}$10^{-5}$</TEX> Torr, we can synthesize as-grown superconducting YBCO films at a deposition rate of around 10 nm/s. Relatively high temperatures of around 90$0^{circ}C$ was necessary in this process so far, and it suggests that this temperature at a given oxygen activity allows a Ba-Cu-O liquid formation along with an YBCO epitaxy. Local critical current density shows a clear correlation with local resistivity. Homogeneous transport properties with a large critical current density ($4 ∼ 5 MA/ extrm{cm}^2$ at 77K, 0T) are observed in top faulted region while it is found that the bottom part carries little supercurrent with a large local resistivity. Therefore, it is possible that thickness dependence of critical current density is closely related with a topological variation of good superconducting paths and/or grains in the film bodies. The information derived from it may be useful in the characterization and optimization of superconducting films for electrical power and other applications.