磁通导引运动的模型与实验
Guided flux motion: models and experiment
摘要：
本文简要概述了现有的模型描述引导磁通运动。第一个模型是由Niessen等人提出的。该模型在单涡近似下工作，并提供了对该效应的定性解释，但在大多数情况下，它给出了一个高估的引导角。随机模型解释了实验观察到的减少的引导角的效果，所谓的滑动效应，由热波动的影响。然而，进行的估计表明，热波动不应该是如此显着。另一种引导模型是各向异性钉扎模型。该模型在临界态近似下工作，滑移效应是各向异性钉扎和涡旋相互作用共同作用的结果。所有这三个模型的预测验证的例子超导Nb-Ti带含有约6体积% {/α}-Ti，它作为强钉扎中心。以不同角度切割样品以滚动允许控制驱动力的方向。结果表明，当达到标准的电场强度时，沿样品不同位置的导向角有明显的变化，这可以用涡旋物质运动的塑性模式来解释。在这种情况下，各向异性钉扎模型半定量地预测在样品长度上平均的方向角。随着驱动力的增加，涡旋物质运动进入弹性模式，并且引导角沿样品变得均匀。
英文摘要：
The article provides a brief overview of existing models describing guided flux motion. The first model was proposed by Niessen et al. This model works in the single-vortex approximation and provides qualitative explanation of the effect, but in most cases it gives an overestimated guiding angle. The stochastic model explains the experimentally observed effect of decreasing the guiding angle, the so-called slipping effect, by the influence of thermal fluctuations. However, the performed estimates show that thermal fluctuations should not be so significant. An alternative guiding model is the anisotropic pinning model. This model works in the critical state approximation, and the slipping effect is the result of the combined action of anisotropic pinning and vortex interaction. The predictions of all three models are verified by the example of a superconducting Nb-Ti tape containing about 6 vol. % {/alpha}-Ti, which acts as strong pinning centers. Cutting samples at different angles to rolling allows one to control the direction of the driving force. It was found that when the standard criterion of the electric field is reached, the guiding angle varies significantly at different places along the sample, which is explained by the plastic mode of the vortex matter motion. In this case, the anisotropic pinning model semi-quantitatively predicts the direction angle averaged over the sample length. With an increase in the driving force, the vortex matter motion passes into an elastic mode, and the guiding angle becomes uniform along the sample.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
