Proposal on a design concept of thin-film coated conductors using iron-based superconductors

关于使用铁基超导体的薄膜涂层导体的设计概念的提案

• 批准号: 23750214
• 负责人: HIRAMATSU Hidenori
• 金额: $ 2.91万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23750214/
• 关键词: 電気; 磁気デバイス; 超伝導薄膜; 超伝導; 臨界電流; 高温超伝導; 鉄系超伝導体; 薄膜; 傾角粒界接合; 薄膜線材

Transport properties of bicrystal grain boundary (BGB) junctions were studied in cobalt-doped BaFe_2 As_2 (BaFe_2 As_2 :Co) epitaxial films grown on [001]-tilt bicrystal substrates of MgO and (La, Sr)(Al, Ta)O_3 with misorientation angles θ_GB=3-45o. A transition from a strongly-coupled GB behavior to a weak-link behavior was observed in current density- voltage characteristics under self-field around θ_GB ~9°. This result clarifies that the high performance thin-film coated conductors using iron-based superconductors can be fabricated when we employ a metal-tape substrate with the in-plane orientation <9°.

本文研究了在MgO和（La，Sr）（Al，Ta）O_3双晶衬底上生长的掺钴BaFe_2As_2（BaFe_2As_2：Co）外延薄膜的双晶晶界（BGB）结的输运性质。在θ_GB ~9°附近，自场作用下的电流密度-电压特性由强耦合的GB行为向弱连接行为转变。这一结果表明，采用面内取向<9°的金属带衬底可以制备高性能的铁基超导薄膜涂层导体。