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首页> 外文期刊>Physica, C. Superconductivity and its applications >Field-angular dependence study of the critical current density in (RE)Ba2Cu3O7 films with nanoprecipitates larger than normal-core diameter of a quantized flux line
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Field-angular dependence study of the critical current density in (RE)Ba2Cu3O7 films with nanoprecipitates larger than normal-core diameter of a quantized flux line

机译：纳米尺寸大于量化通量线常态直径的（RE）Ba2Cu3O7膜中临界电流密度的场角依赖性研究

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摘要

The magnetic-field angle dependence of the critical current density J(c)(H, theta) reflects the background flux-pinning mechanisms in high-J(c) (RE)Ba2Cu3O7 (RE: rare-earth elements) thin films, where. is the angle between the applied magnetic field H and the c-axis of (RE)BCO. It is because the pinning of flux lines by appropriate crystalline defects determines J(c). Yamasaki and coworkers found that nanoprecipitates larger than normal-core diameter of a quantized flux line caused broad J(c)(theta) peaks centered on the c-axis in moderate magnetic fields of mu H-0 = 0.5-2 T. These broad peaks have been reasonably explained by a simple theoretical model that considers the linear summation of core pinning interactions and the angular dependence of the coherence length [H. Yamasaki, K. Ohki, H. Yamada, Y. Nakagawa, Y. Mawatari, Supercond. Sci. Technol. 21 (2008) 125011]. On the other hand, several research groups have recently observed almost flat J(c)(theta) curves at H // c in (RE)BCO thin films containing a high density of nanoprecipitates whose sizes are 1-4 times larger than the normal-core diameter. Some of these films showed constant J(c)(theta) values at H // c that are as high as those at H // ab. The origin of the different behaviors of the J(c)(theta) curves is qualitatively explained by simple core-pinning models, which have been modified by introducing the concept of flux bending that has been reported in recent theoretical works on the strong flux pinning of nanoparticles.
机译：临界电流密度J（c）（h，theta）的磁场角度依赖性反映了高j（c）（Re）ba2cu3o7（Re：稀土元素）薄膜的背景磁通钉钉机制，其中。是施加的磁场H和（RE）BCO的C轴之间的角度。这是因为通过适当的晶体缺陷的磁通线的固定确定了j（c）。 Yamasaki和同事发现，纳米尺寸大于量化的通量线的正常芯直径引起的宽j（c）（θ）峰，以Mu H-0的中等磁场为中心的C轴，这些宽度= 0.5-2t。这些宽峰被一个简单的理论模型合理地解释，该模型考虑了核心钉扎相互作用的线性求和和相干长度的角度依赖性[H. Yamasaki，K. Ohki，H. Yamada，Y. Nakagawa，Y. Mawatari，Supercond。 SCI。技术。 21（2008）125011]。另一方面，若干研究组最近观察到含有高密度的纳米尺寸的高密度的H //c的H //c的扁平J（c）（Theta）曲线，其尺寸比正常的大小为1-4倍-core直径。这些薄膜中的一些显示H // C的常数J（c）（θ）值，其与h // ab处的高度高。 J（c）（θ）曲线的不同行为的起源是通过简单的芯钉型模型来定制解释的，这通过引入近期理论作品上报告的焊剂弯曲的概念来进行修改纳米粒子。

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