YBCO films grown by reactive co-evaporation on simplified IBAD-MgO coated conductor templates
YBCO films grown by reactive co-evaporation on simplified IBAD-MgO coated conductor templates
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DOI：
10.1088/0953-2048/23/1/014018
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发表时间：
2010-01-01
影响因子：
3.6
通讯作者：
Moeckly, Brian
中科院分区：
文献类型：
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作者：
Matias, Vladimir;Rowley, E. John;Moeckly, Brian
我们展示了通过循环沉积和反应（RCE-CDR）在离子束辅助沉积（IBAD-）纹理模板上通过YBa（2）Cu（3）O（y）（YBCO）反应共蒸发制备的涂层导体，该模板通过消除外延缓冲层而简化。抛光和未抛光的哈氏合金基材被用作 IBAD 模板的起始材料。然后沉积Y(2)O(3)床层，随后沉积IBAD织构的MgO和薄的同质外延MgO层。 MgO 封端模板用于通过 RCE-CDR 直接沉积 YBCO。未掺杂 YBCO 材料获得的临界电流密度与之前使用 LaMnO(3) 或 SrTiO(3) 外延缓冲层和最先进的涂层导体测量的最佳值相当。结构表征数据表明，YBCO 薄膜取向良好，模板坚固。电学测量还表明，未掺杂的 YBCO 没有薄弱环节和典型的磁场行为，其特征是自然发生的强钉扎中心密度低以及沿 ab 方向的相关性。
We demonstrate coated conductors fabricated by reactive co-evaporation of YBa(2)Cu(3)O(y) (YBCO) by cyclic deposition and reaction (RCE-CDR) on ion-beam-assisted-deposition-(IBAD-) textured templates simplified by the elimination of the epitaxial buffer layer. Hastelloy substrates, both polished and unpolished, were used as a starting material for the IBAD templates. Y(2)O(3) bed layers were then deposited followed by IBAD- textured MgO and a thin homoepitaxial MgO layer. The MgO-terminated templates were used for direct deposition of YBCO by RCE-CDR. Critical current densities obtained for the undoped YBCO material are comparable to the best values measured previously with the use of LaMnO(3) or SrTiO(3) epitaxial buffer layers and state-of-the-art coated conductor results. The structural characterization data indicate a well oriented YBCO film with a robust template. Electrical measurements also indicate no weak links and a typical magnetic field behavior of undoped YBCO, characterized by a low density of naturally occurring strong pinning centers and correlations along the ab direction.