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Rock-Kil Ko,Sung-Hwan Bae,Myung-Jin Jung,Se-Hoon Jang,Kyu-Jeong Song,Chan Park,Myung-Hwan Sohn,Suk-ill Kang,Sang-Soo Oh,Dong-woo Ha,Hong-Soo Ha,Ho-Sup Kim,Young-Cheol Kim IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3
<P>In order to investigate the possibility of using mixed rare earth (Nd<SUB>1/3</SUB>Eu<SUB>1/3</SUB>Gd<SUB>1/3</SUB>)Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-x</SUB> (NEG123) as the superconducting layer of the HTS coated conductor, the NEG123 thin film was deposited epitaxially on LAO(100) single crystal and IBAD_YSZ metal templates by pulsed laser deposition. Systematic studies were carried out to investigate the influences of deposition parameters of PLD on the microstructure, texture and superconducting properties of NEG-123 coated conductor. Deposition at oxygen partial pressure of 600 mTorr was needed to routinely obtain high quality NEG123 films with J<SUB>C</SUB>'s (77 K) over 2 MA/cm<SUP>2</SUP> and Tc's over 90 K (DeltaT ~ 2 K) . We verified from magnetization study that the NEG123 has an improved in-field Jc as the field increases at temperatures between 10 K and 77 K compared with Gd123. The J<SUB>C</SUB> (77 K, self field) and the value of onset T<SUB>C</SUB> of NEG123 thin film on LAO substrate was 4.0 MA/cm<SUP>2</SUP> and 92 K, respectively. This is the first report, to the best of our knowledge, of coated conductors with NEG123 film as the superconducting layer which have Ic and Jc over 40 A/cm-width and 1.6 MA/cm<SUP>2</SUP> at 77 K, self field. This study shows the possibility of using NEG123 film as the superconducting layer of the HTS coated conductor which can be used in high magnetic field power electric devices.</P>
Rock Kil Ko,Boomin Kang,Donghyuk Kim,Dongwoo Ha,박찬,Sejin Yoon,김영철 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.6
In order to investigate the effect of solution concentration on the surface properties of Y2O3 films dipcoated on a flexible metal substrate, films were coated on unpolished Hastelloy substrate followed by a heat treatment process to convert the film to amorphous Y2O3. Solutions of different molarities were used to deposit films with different thicknesses, and the surface smoothness and morphologies were investigated. The thickness of the film increased along with the molarity of the coating solution. The rate of improvement of the smoothness was fast when solutions of high molarity were used; this rate improvement can help reduce the number of coatings needed to reach the desired level of smoothness. It was found that multiple coated Y2O3 film has a smooth surface because the film covers up the irregular surface contours of the substrate.
Rock-Kil Ko,O-Jong Kwon,Kyu-Jeong Song,Ahmad, D.,Chan Park,Joon-Ho Lee,Seung-Su An,Nam-Jin Lee,Sang-Soo Oh,Young-Cheol Kim Institute of Electrical and Electronics Engineers 2007 IEEE transactions on applied superconductivity Vol.17 No.2
<P>TmBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> films which is one of the (Rare earth)Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> high temperature superconductors with small ionic radius of rare earth element, were deposited on STO (100) single crystal substrates and Y<SUB>2</SUB>O<SUB>3</SUB>/YSZ/CeO<SUB>2</SUB> buffered metal substrates by pulsed laser deposition. The J<SUB>c</SUB> (77 K) and the value of onset of Tc TmBCO thin film on STO substrate was 4.5 MA/cm<SUP>2</SUP> and 86 K, respectively. The of J<SUB>c</SUB> TmBCO coated conductor on metal substrate was 1 MA/cm<SUP>2</SUP> . In-field property measurement was carried out at temperatures between 10 K and 77 K in magnetic filed up to 6 T in PPMS system. This is the first report, to the best of our knowledge, of TmBCO thin films and coated conductors with TmBCO film as the superconducting layer which have critical current densities at 77 K of 4.5 MA/ cm<SUP>2</SUP> and 1 MA/cm<SUP>2</SUP> , respectively. The superconducting properties of TmBCO films and the possibility of using TmBCO film as the superconducting layer of the HTS coated conductor, were investigated.</P>
Meter-long coated conductor by R2R PVD methods on RABiTS template
Ko, Rock-Kil,Kim, Ho-Sup,Ha, Hong-Soo,Chung, Jun-Ki,Yang, Joo-Saing,Park, Yu-Mi,Shi, Dong-Qi,Song, Kyu-Jeong,Park, Chan,Yoo, Sang-Im,Moon, Seung-Hyun,Kim, Young-Cheol The Korea Institute of Applied Superconductivity a 2004 한국초전도저온공학회논문지 Vol.6 No.4
Three film deposition systems (pulsed laser deposition, sputtering, and evaporation) equipped with reel-to-reel metal tape moving apparatus were installed and used to make meter-long coated conductor. Buffer architecture of $CeO_2/YSZ/Y_2O_3$ was deposited on Ni alloy using sputtering, evaporation, and PLD. YBCO superconducting layer was continuously deposited on buffered metal tape by PLD. End-to-end critical current ($I_c$) of 107 A at 77 K, self-field has been achieved in 1 em-wide tape (thickness 0.6∼1.0${\mu}{\textrm}{m}$, tape moving speed 54∼72 cm/hr) over 1 meter length.