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arXiv 1706.02449cond-mat.supr-con
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第二类超导体涡旋中的对电势梯度充电

Charging due to Pair-Potential Gradient in Vortex of Type-II Superconductors

Marie Ohuchi, Hikaru Ueki, Takafumi Kita

摘要:

除了金属和半导体中的霍尔效应所熟悉的磁洛伦兹力之外,还存在由对电势梯度(PPG)引起的超导体特有的充电机制。我们将其纳入超导的增广准经典方程与洛伦兹力研究充电的孤立涡旋在一个平衡的s波II型超导体。发现PPG机制引起集中在芯内的电荷,其在芯中心处的量值可以是由洛伦兹力引起的量值的10至100倍。我们的详细计算的空间,温度和磁穿透深度依赖的涡核电荷显示,PPG机制占主导地位的核心充电的孤立涡在很宽的参数范围内。这两种机制也被发现工作在本模型的核心中心与各向同性费米表面的相加。

英文摘要:

Besides the magnetic Lorentz force familiar from the Hall effect in metals and semiconductors, there exists a mechanism for charging peculiar to superconductors that is caused by the pair-potential gradient (PPG). We incorporate it in the augmented quasiclassical equations of superconductivity with the Lorentz force to study charging of an isolated vortex in an equilibrium s-wave type-II superconductor. It is found that the PPG mechanism gives rise to charging concentrated within the core whose magnitude at the core center can be 10 to 100 times larger than that caused by the Lorentz force. Our detailed calculations on the spatial, temperature, and magnetic-penetration-depth dependences of the vortex-core charge reveal that the PPG mechanism contributes dominantly to the core charging of the isolated vortex over a wide parameter range. The two mechanisms are also found to work additively at the core center for the present model with an isotropic Fermi surface.

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