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학술대회자료
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Yang, W.I. (Department of Physics and Center for Advanced Materials and Devices) Lee, J.H. (Department of Physics and Center for Advanced Materials and Devices) Ryu, J.S. (Department of Physics and Center for Advanced Materials and Devices) Ko, Y.B. (Department of Physics and Center for Advanced Materials and Devices) Chung, Y.S. (Department of Physics and Center for Advanced Materials and Devices) Hur, Jung (Department of Electronic Engineering Konkuk University) Lee, Sang-Young (Department of Physics and Center for Advanced Materials and Devices)
저널정보
한국초전도학회 한국초전도학회 High Temperature Superconductivity 한국초전도학회 2000년도 High Temperature Superconductivity Vol.X
발행연도
2000.1
수록면
201 - 206 (6page)

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Effects of the post-annealing temperature of CeO$_2$ buffer layers on the properties of YBCO films on CeO$_2$-buffered sapphire were investigated. 45 nm-thick CeO$_2$ buffer layer was prepared in-situ on r-cut sapphire using an on-axis rf magnetron sputtering method, which was later post-annealed at temperatures between 950$^{\circ}$C and 1100$^{\circ}$C in an oxygen-flowing environment. YBCO films were prepared on CeO$_2$-buffered sapphire (CbS), for which the surface morphology, crystal structures and electrical properties of the YBCO films were studied. YBCO films on post-annealed CbS appeared to have better properties than those on as-grown CbS with regard to the morphological, structural and electrical properties when the YBCO films were prepared on CeO$_2$ buffer layer post-annealed at temperatures of 1000 - 1050$^{\circ}$C. A TE$_{011}$ mode rutileloaded cylindrical cavity resonators was fabricated with the YBCO films placed as the endplates, for which the unloaded Q of the resonator was measured. It turned out that the resonator with the endplates prepared from the YBCO films on postannealed CbS at 1000 $^{\circ}$C showed the highest unloaded Q with the value more than 8 ${\times}$ 10$^5$ at 30 K and 8.6 CHz, revealing that the YBCO films on post-annealed CbS at 1000$^{\circ}$C the temperature could be the lowest among the YBCO films on post-annealed CbS.

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