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$CeO_2$ 완충층의 두께가 $Al_2O_3$ 기판 위에 성장된 $YBa_2Cu_3O_{7-{\delta}}$ 박막의 초전도 특성에 미치는 영향
임해용,김인선,김동호,박용기,박종철,Lim, Hae-Ryong,Kim, In-Seon,Kim, Dong-Ho,Park, Yong-Ki,Park, Jong-Chul 한국센서학회 1999 센서학회지 Vol.8 No.2
$Al_2O_3$ (알루미나 및 R-면 사파이어)기판 위에 c-축 $YBa_2Cu_3O_{7-{\delta}}$ (YBCO) 박막을 펄스레이저 증착법을 이용하여 성장하였다. 완충층으로 사용하기 위해 $Al_2O_3$ 기판 위에 증착한 $CeO_2$ 박막의 결정성은 기판온도에 많은 영향을 받았다. $CeO_2$ 박막은 $800^{\circ}C$의 기판온도에서 $\alpha$-축방향으로 잘 성장하였으며, $CeO_2$ 완충층의 두께에 따라 YBCO/$CeO_2/Al_2O_3$ 박막의 초전도 특성은 큰 변화를 나타내었다. 알루미나 기판 위에서 $CeO_2$ 완충층의 두께는 약 $1200\;{\AA}$이하, 사파이어 기판의 경우 $100{\sim}1000\;{\AA}$ 범위에서 YBCO 박막은 양호한 초전도 특성을 나타내었으나, 그 보다 두껍게 성장시킬 경우 초전도 특성이 급격하게 나빠졌다. 알루미나 기판 위에 성장된 YBCO 박막의 임계온도는 83 K였으며, R-면 사파이어 기판 위에 성장된 YBCO 박막의 임계온도는 ${\geq}89.5\;K$였고, 임계전류밀도는 77K에서 $3{\times}10^6\;A/cm^2$로 나타났다. C-axis oriented $YBa_2Cu_3O_{7-{\delta}}$ (YBCO) thin films were grown on $Al_2O_3$ (alumina and R-plane sapphire) substrates by a pulsed laser deposition method. The crystallinity of the $CeO_2$ buffer layer on sapphire substrate exhibit a strong dependence on the deposition temperature, resulting in the growth of a-axis orientation at $800^{\circ}C$. The superconducting properties of YBCO thin films on $Al_2O_3$ substrates showed strong dependence on both thickness and crystallinity of the $CeO_2$ buffer layer. Critical temperature of YBCO film on alumina substrate was ${\sim}83\;K$. In the case of R-plane sapphire substrate,
CeO2 완충층의 두께가 Al2O3 기판 위에 성장된 YBa2Cu3O7-δ 박막의 초전도 특성에 미치는 영향
임해용(Hae Ryong Lim),김인선(In Seon Kim),김동호(Dong Ho Kim),박용기(Yong Ki Park),박종철(Jong Chul Park) 한국센서학회 1999 센서학회지 Vol.8 No.2
C-axis oriented YBa₂Cu₃O_(7-δ) (YBCO) thin films were grown on Al₂O₃ (alumina and R-plane sapphire) substrates by a pulsed laser deposition method. The crystallinity of the CeO₃ buffer layer on sapphire substrate exhibit a strong dependence on the deposition temperature, resulting in the growth of a-axis orientation at 800 ℃. The superconducting properties of YBCO thin films on Al₂O₃ substrates showed strong dependence on both thickness and crystallinity of the CeO₂ buffer layer. Critical temperature of YBCO film on alumina substrate was ∼83 K. In the case of R-plane sapphire substrate.
펄스 레이저 증착법으로 layer - by - layer 성장시킨 YBa2Cu3O7 박막의 초전도 특성
김인선,임해용,김동호,박용기,박종철 ( In seon Kim,Hae Ryong Lim,Dong Ho Kim,Yon Ki Park,Jong Chul Park ) 한국센서학회 1998 센서학회지 Vol.7 No.1
High quality c-axis oriented YBa₂Cu₃O_7 films were prepared using the pulsed laser deposition on SrTiO₃(100) substrate. The atomically smooth SrTiO₃ surface with terraces one unit cell in height could be obtained by a high temperature annealing. YBa₂Cu₃O_7 thin films deposited on the substrates exhibited layer-by-layer growth with a c-axis unit cell height. YBa₂Cu₃O_7 thin films thus prepared showed critical temperature ≥90 K with transition width ≤0.6 K, room temperature resistivity of ∼300 μΩcm, and critical current density ∼4.6 X 10^6 A/㎠ at 77 K.
초고속 카메라 기반 가시광 통신을 위한 거리별 측정 데이터 및 분석
서현욱(HyunWook Seo),안강일(Kang-Il Ahn),김주영(Ju-Young Kim),오준규(JunKyu Oh),임해용(Hae-Ryong Lim),정성윤(Sung-Yoon Jung),장자순(Ja-Soon Jang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
We propose a analysis and measured data depend on distance for visible light communication based on high speed camera at intersection for ITS. In this paper, the communication between high-speed camera and a LED rear lamp is approached using LED rear lamp as the transmitter, and high-speed camera as the receiver. The LEDs in the transmitter are emitted with 4000Hz and the images of those emitting LEDs are captured with 8000fps by a high-speed camera for conducting asynchronous communication method. And experimental results using appropriate images and figures showed the effectiveness for the proposal.
사파이어 기판에 제작한 YBa₂Cu₃O_(7-δ) 박막의 특성연구
임해용,김인선,김동호,박종철,박용기 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
C-axis oriented YBa_(2)Cu_(3)O_(7-δ) (YBCO) thin films on R-cut sapphire substrate were grown by pulsed laser deposition. CeO_(2) film was used as a buffer layer for YBCO deposition on R-cut sapphire substrate. Crystallinity of CeO_(2) buffer layer was researched by XRD. Surface morphology and superconducting properties of YBCO thin films were characterized by SEM and four probe method. Critical temperature of YBCO thin films was ≥89 K, and critical current density was 1.5 x10^(6) A/cm^(2) if at 77 K.