Angular dependence of Jc for YBCO coated conductors at low temperature and very high magnetic fields
Angular dependence of Jc for YBCO coated conductors at low temperature and very high magnetic fields
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DOI：
10.1088/0953-2048/23/1/014003
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发表时间：
2009
影响因子：
3.6
通讯作者：
A. Xu;J. Jaroszynski;F. Kametani;Z. Chen;D. Larbalestier;Y. Viouchkov;Y. Chen;Y. Xie;V. Selvamanick
中科院分区：
文献类型：
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作者：
A. Xu;J. Jaroszynski;F. Kametani;Z. Chen;D. Larbalestier;Y. Viouchkov;Y. Chen;Y. Xie;V. Selvamanick
我们给出了三种用于构造高场螺线管的YBa2Cu3O7−x(YBCO)涂层导体的高场角相关临界电流密度(JC)数据。我们发现，像BaZrO_3(BZO)纳米棒这样的强关联销，虽然在77K时产生了很强的c轴峰，但在4K时几乎没有可测量的贡献。在4K时，将磁场从<；5提高到30T会导致显著的从低场的金兹堡-朗道类JC(θ)到高场的明显的尖点行为。透射电子显微镜显示，所有样品都含有高密度的层错，这些层错加强了由Cu-O电荷储存层的本征ab面钉扎所产生的平行于ab面的平面关联钉扎。
We present very high field angle dependent critical current density (Jc) data for three recently obtained YBa2Cu3O7−x (YBCO) coated conductors used in the construction of high field solenoids. We find that strongly correlated pins, such as BaZrO3 (BZO) nanorods, while yielding strong c-axis peaks at 77 K, produce almost no measurable contribution at 4 K. Raising the field from <5 to 30 T at 4 K causes a marked transition from a Ginzburg–Landau-like Jc(θ) at low fields to a marked cusp-like behavior at high fields. Transmission electron micrographs show that all samples contain a high density of stacking faults which strengthen the plane correlated pinning parallel to the ab planes produced by the intrinsic ab-plane pinning of the Cu–O charge reservoir layers.