Control of Flux Pinning in MOD YBCO Coated Conductor
Control of Flux Pinning in MOD YBCO Coated Conductor
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DOI：
10.1109/tasc.2007.899438
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发表时间：
2007-07
影响因子：
1.8
通讯作者：
Wei Zhang;Y. Huang;Xiaoping Li;T. Kodenkandath;M. Rupich;U. Schoop;D. Verebelyi;C. Thieme;E. Siegal;T. Holesinger;B. Maiorov;L. Civale;Dean J. Miller;V. Maroni;Jing Li;P. M. Martin;E. Specht;A. Goyal;M. Paranthaman
中科院分区：
文献类型：
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作者：
Wei Zhang;Y. Huang;Xiaoping Li;T. Kodenkandath;M. Rupich;U. Schoop;D. Verebelyi;C. Thieme;E. Siegal;T. Holesinger;B. Maiorov;L. Civale;Dean J. Miller;V. Maroni;Jing Li;P. M. Martin;E. Specht;A. Goyal;M. Paranthaman
两种不同类型的缺陷结构已被确定为金属有机沉积 YBCO 薄膜中增强钉扎的原因。添加稀土会导致在 YBCO 基质中形成纳米点，这些纳米点形成不相关的钉扎中心，从而增加所有磁场方向的钉扎。 124 型共生体形成为平行于 ab 平面的层状结构，当磁场定向在 ab 平面上时，它们负责大电流增强。 TEM 研究表明，共生体源自含亚铜的二次相颗粒，其密度部分由稀土掺杂水平控制。已确定控制该相形成的关键工艺参数，从而控制f 24 共生形成。这项工作表明，通过过程控制和适当的导体设计，通过调整成分或通过不同功能层的多个涂层，可以实现所需的角度依赖性。
Two different types of defect structures have been identified to be responsible for the enhanced pinning in metal organic deposited YBCO films. Rare earth additions result in the formation of nanodots in the YBCO matrix, which form uncorrelated pinning centers, increasing pinning in all magnetic field orientations. 124-type intergrowths, which form as laminar structures parallel to the ab-plane, are responsible for the large current enhancement when the magnetic field is oriented in the ab-plane. TEM studies showed that the intergrowths emanate from cuprous containing secondary phase particles, whose density is partially controlled by the rare earth doping level. Critical process parameters have been identified to control this phase formation, and therefore, control the f 24 intergrowth formation. This work has shown that through process control and proper conductor design, either by adjusting the composition or by multiple coatings of different functional layers, the desired angular dependence can be achieved.