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arXiv 1005.5015cond-mat.supr-concond-mat.mes-hallcond-mat.mtrl-sci
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第二类超导体中输运电流的反转机制

Inversion mechanism for the transport current in type-II superconductors

H. S. Ruiz, C. López, A. Badía-Majós

摘要:

对第二类超导体中的纵向输运问题(电流平行于某一偏置磁场施加)进行了理论分析。简化配置的分析结果的基础上,并依赖于一般情况下的数值研究,它表明,一个显着的反演的当前流动在一个表面层可以预测在广泛的实验条件下。强烈不均匀的电流密度分布,其特征在于增强运输向中心和减少,甚至是负的,在导体的外围值,预计当磁通脱钉和消耗(通过线切割)的物理机制被召回。预测了一些显著的附带效应,如局部和全局顺磁行为。我们的几何描述的宏观材料的法律允许的物理现象的图形解释的运输回流。

英文摘要:

The longitudinal transport problem (the current is applied parallel to some bias magnetic field) in type-II superconductors is analyzed theoretically. Based on analytical results for simplified configurations, and relying on numerical studies for general scenarios, it is shown that a remarkable inversion of the current flow in a surface layer may be predicted under a wide set of experimental conditions. Strongly inhomogeneous current density profiles, characterized by enhanced transport toward the center and reduced, or even negative, values at the periphery of the conductor, are expected when the physical mechanisms of flux depinning and consumption (via line cutting) are recalled. A number of striking collateral effects, such as local and global paramagnetic behavior, are predicted. Our geometrical description of the macroscopic material laws allows a pictorial interpretation of the physical phenomena underlying the transport backflow.

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