Vapor-Liquid-Solid成長したLaBa2Cu3Oy薄膜の高Tc化に向けた結晶構造制御

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2015/10/01

タイトル(英語): Controlling Crystal Structure to Improve Tc of LaBa2Cu3Oy Thin Films Prepared by Vapor-Liquid-Solid Growth Mode

著者名: 山垣　陵太（名古屋大学大学院工学研究科エネルギー理工学専攻），一野　祐亮（名古屋大学大学院工学研究科エネルギー理工学専攻），吉田　隆（名古屋大学大学院工学研究科エネルギー理工学専攻）

著者名(英語): Ryota Yamagaki (Dept. of Energy Engineering and Science, Nagoya University), Yusuke Ichino (Dept. of Energy Engineering and Science, Nagoya University), Yutaka Yoshida (Dept. of Energy Engineering and Science, Nagoya University)

キーワード: LaBa2Cu3Oy薄膜，Vapor-Liquid-Solid成長法，応力，結晶配向性　　LaBa2Cu3Oy thin film，Vapor-Liquid-Solid growth，strain，crystalline

要約(英語): In order to apply REBa2Cu3Oy (REBCO: RE=Rare Earth) superconductor, the superconducting properties of REBCO in magnetic field should be improved. For the improvement the superconducting properties, we focused on LaBa2Cu3Oy superconductor. The LaBCO has the highest critical temperature (Tc) among REBCOs. On the other hand, it is very difficult to obtain high Tc LaBCO thin films because LaBCO is easily substitutes La3+ ions for Ba2+ sites and forms solid solutions which have low Tc. For this problem, we used Vapor-Liquid-Solid growth mode (VLS) in fabricating the LaBCO epitaxial films in order to prevent La/Ba substitutions. In this study, we investigated an effect of the VLS growth mode on the superconductivities in the LaBCO thin films and also studied substrates dependence of LaBCO thin films fabricated on various substrates and a buffer layer. From comparison between a VLS-LaBCO film and a conventional LaBCO film, we confirmed that the VLS growth mode was able to prevent the La/Ba substitutions. We compared superconducting properties of LaBCO thin films prepared on various substrates and a buffer layer and found that superconducting properties of LaBCO thin films was influenced by both the strain arising from the substrates and LaBCO crystallinity.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.135 No.10 （2015） 特集：光エネルギー応用技術の最新動向

本誌掲載ページ: 611-617 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/135/10/135_611/_article/-char/ja/