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학술저널
저자정보
Sungho Lee (Konkuk University) Woo Il Yang (건국대학교) Ho Sang Jung (Konkuk Univ.) Won-Jae Oh (Seoul National University) Jiyeong Jang (Konkuk University) Jae-Hun Lee (SuNAM Co Ltd.) Kihyeok Kang (SuNAM Co. Ltd.) Seung-Hyun Moon (SuNAM Co Ltd.) Sang Im Yoo (Seoul National University) 이상영 (건국대학교)
저널정보
대한금속·재료학회 Electronic Materials Letters Electronic Materials Letters Vol.14 No.5
발행연도
2018.1
수록면
646 - 654 (9page)

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High-TC GdBa2Cu3O7−δ (GdBCO) superconductor has been popular for making superconductive tapes that have much potentialfor various fields of large-scale applications. We investigated aging effects on the microwave surface resistance (RS) of Ag-coatedGdBCO layer on Hastelloy substrate, so called GdBCO coated conductors (CCs), and Ag-coated GdBCO films on LaAlO3(LAO) single-crystal substrates at cryogenic temperatures and compared them with each other. Unlike the RS of Ag-coatedGdBCO films showing significant degradation in 4 weeks, no significant aging effects were found in our Ag-coated GdBCOCCs aged 85 weeks. The reactive co-evaporation deposition and reaction (RCE-DR) method was used for preparing the AgcoatedGdBCO CCs. Such durability of the Ag-coated GdBCO CCs in terms of the RS could be explained by existence of aprotective impurity phase, i.e., Gd-free Ba–Cu–O phase as confirmed by transmission electron microscopy study combined withthe energy-dispersive X-ray spectroscopy measurements. Although the scope of this study is limited to the Ag-coated GdBCOCCs prepared by using the RCE-DR method, our results suggest that a solution for preventing the aging effects on transportproperties of other kinds of Ag-coated GdBCO CCs could be realized by means of an artificially-grown protective impurity layer. Graphical AbstractKeywords Aging effect · GdBa2Cu3O7−δ · Surface resistance · Coated conductor · Film* Sang Young Leesylee@konkuk.ac.krExtended author

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