Pulsed Laser Deposition法で作成したREBa2Cu3Oy薄膜の配向性と超伝導特性 (RE = Nd, Sm, Gd, Y and Yb)
Pulsed Laser Deposition法で作成したREBa2Cu3Oy薄膜の配向性と超伝導特性 (RE = Nd, Sm, Gd, Y and Yb)
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脉冲激光沉积法制备REBa2Cu3Oy薄膜的取向和超导性能（RE=Nd、Sm、Gd、Y和Yb）
DOI：
10.2221/jcsj.38.672
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
要 松本
中科院分区：
文献类型：
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作者：
祐亮 一野;公彦 須藤;隆 吉田;吉明 高井;昌志 向田;要 松本
控制REBa 2Cu 3 Oy（RE 123; RE表示Nd、Sm、Gd、Y和Yb）薄膜中的轴取向对于许多超导应用是重要的问题，因为RE 123材料具有各向异性特性（例如，不可逆场、临界电流密度等）。为了获得具有优良超导性能的RE 123薄膜，我们系统地研究了RE 123薄膜的取向、取向控制机制和超导性能。发现RE_（123）薄膜在MgO和SrTiO_3上的择优取向为c轴取向。RE/Ba（RE=Sm，Gd）替代的RE 123薄膜表明，随着RE/Ba替代量的增加，c轴和a，c轴混合取向边界线处的衬底温度降低。这些事实意味着RE_（123）薄膜的取向主要取决于其相变温度。RE_（123）薄膜的最高临界电流密度分别为Sm_（123）7.93 MA/cm ~ 2、Gd_（123）3.03 MA/cm ~ 2和Yb/Nd_（123）1.85 MA/cm ~ 2。
Controlling the axis orientation in REBa2Cu3Oy (RE123; RE meaning Nd, Sm, Gd, Y and Yb) thin films is an important problem for many superconducting applications since RE123 materials have anisotropic properties (e.g., irreversible field, critical current density and so on) along their crystallographic axes. To obtain the RE123 thin films with excellent superconducting properties, we systematically studied the orientation, mechanism of orientation control and superconducting properties in RE123 thin films. We found that the preferred orientation of RE123 thin film on MgO and SrTiO3 is c-axis orientation. RE123 thin films with RE/Ba substitution (RE=Sm, Gd) showed that the substrate temperature corresponding to the boundary line between the c-axis and a, c-axis mixed orientation decreased as RE/Ba substitution increased. These facts imply that the orientations of RE123 thin film are principally determined by their peritectic temperatures. The highest critical current densities of RE123 thin films so far are 7.93 MA/cm2 for Sm123, 3.03 MA/cm2 for Gd123 and 1.85 MA/cm2 for Yb/Nd123.