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Effects of Sm:Ba:Cu Composition Ratio on the Superconducting Properties of SmBCO Coated Conductor Prepared by using a Composition Gradient Method  

Kim, H.S. (Korea Electrotechnology Research Institute)
Oh, S.S. (Korea Electrotechnology Research Institute)
Jang, S.H. (Department of Physics, Korea Advanced Institute of Science and Technology)
Min, C.H. (Korea Electrotechnology Research Institute)
Ha, H.S. (Korea Electrotechnology Research Institute)
Ha, D.W. (Korea Electrotechnology Research Institute)
Ko, R.K. (Korea Electrotechnology Research Institute)
Youm, D.J. (Department of Physics, Korea Advanced Institute of Science and Technology)
Moon, S.H. (Superconductor, Nano & Advanced Materials Corporation)
Chung, K.C. (Korea Institute of Materials Science)
Publication Information
Progress in Superconductivity / v.13, no.1, 2011 , pp. 7-11 More about this Journal
Abstract
The effects of Sm:Ba:Cu composition ratio in SmBCO coated conductor on their superconducting properties were investigated. The SmBCO coated conductors were fabricated by reactive co-evaporation method using EDDC(Evaporation using Drum in Dual Chamber) system. In this system, we could obtain various samples with different composition ratios in a batch by the technique providing composition gradient at deposition zone. From the specimens prepared by EDDC system, we found that composition ratio is uniform parallel to the drum axis, but gradient along the circumferential direction of the drum. We installed a shield having parallelogram open area between the deposition chamber and the evaporation chamber in EDDC system, and attached a 30 cm long template, which is parallel to drum axis, onto the drum surface. In this configuration, we could obtain SmBCO coated conductors having a gradient composition along the length of template. We measured the composition ratios and surface morphologies with periodic interval by SEM and EDAX, and confirmed the profile of composition ratio. We also measured critical current using non-contact Hall probe critical current measurement system and thereby could plot composition ratio vs. critical current. The maximum critical current was obtained, and the surface morphology with the shape of roof tile was observed at the corresponding composition ratio of Sm:Ba:Cu = 1.01:1.99:4.87. It was also found that composition ratio had an effect on not only critical current but also surface morphology.
Keywords
Coated Conductor; SmBCO; co-evaporation; gradient composition; gradient deposition;
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