实用超导体的临界电流各向异性：分析方法与应用案例
Critical current anisotropy of practical superconductors: analysis methods and application cases
- NRC «Kurchatov Institute»（库尔恰托夫国家研究中心）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文批判性评估了分析实用超导体临界电流各向异性的技术，提出改进的各向异性钉扎模型，并指出缺乏统一解释方法，需进一步研究。
AI中文摘要：
临界电流各向异性的分析对于改进基于超导体的器件具有重要意义。本文批判性地评估了分析实用超导体中临界电流角度依赖性的当代技术，重点关注第二代高温超导带材（涂层导体）。这些技术基于标度模型、涡旋路径模型或各向异性钉扎模型。我们展示了不同化学成分涂层导体中临界电流角度依赖性的实证研究结果。突出了显著特征：稀土替代对高温超导成分中钉扎景观的复杂影响、峰不对称性，以及在固定磁场方向下临界电流对洛伦兹力方向的依赖性。随后将所述技术应用于实验数据集。引入了一种改进的各向异性钉扎模型，以准确描述某些观察到的现象。使用针对拟合变量数量调整的确定系数来评估模型的近似精度。强调了不同模型在解释角度依赖性方面的根本差异。目前尚无通用方法能全面解释所有特征或将它们与高温超导材料的缺陷结构联系起来。这是理解超导体在不同条件下行为的关键空白，并凸显了进一步研究的必要性。
英文摘要：
The analysis of critical current anisotropy is important for improving superconductor-based devices. This article critically evaluates contemporary techniques for analyzing the angular dependence of critical current in practical superconductors, focusing on second-generation high-temperature superconducting tapes (coated conductors). These techniques are based on the scaling model, vortex path model, or anisotropic pinning model. We present empirical findings on critical current angular dependencies in coated conductors of different chemical compositions. Distinctive features are highlighted: the complex effect of rare-earth substitution in the HTS composition on the pinning landscape, peak asymmetry, and the dependence of critical current on Lorentz force direction at fixed magnetic field direction. The described techniques are then applied to the experimental dataset. A refined anisotropic pinning model is introduced to accurately describe certain observed phenomena. Approximation accuracy of the models is assessed using the coefficient of determination adjusted for the number of fitting variables. The fundamental disparity in interpreting angular dependencies with different models is emphasized. No universal methodology yet comprehensively explains all features or links them to the defective structure of the HTS material. This is a critical gap in understanding superconductor behavior under varying conditions and highlights the need for further research.
