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arXiv 0806.0238cond-mat.supr-concond-mat.str-elnucl-th
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电场偏置下超导体的表面能和磁电容

Surface energy and magneto-capacitance of superconductors under electric field bias

K. Morawetz, P. Lipavský, J. Koláček, E. H. Brandt

摘要:

在Ginzburg-Landau(GL)方法中考虑了超导层暴露于垂直电场和平行磁场中的情况。在表面附近求解GL方程并计算表面能。超导态在表面的成核临界场取决于磁场和电场。特别考虑了由抗磁表面电流引起的感应磁场效应。后一种效应强烈依赖于样品的厚度。有效反电容决定了有效穿透深度。结果表明,在表面临界电场处,电容值出现了一个突变。实验建议用于确定的层的有效电容的变化。

英文摘要:

A superconducting layer exposed to a perpendicular electric field and a parallel magnetic field is considered within the Ginzburg-Landau (GL) approach. The GL equation is solved near the surface and the surface energy is calculated. The nucleation critical field of superconducting state at the surface depends on the magnetic and electric fields. Special consideration is paid to the induced magnetic-field effect cause d by diamagnetic surface currents. The latter effect is strongly dependent on the thickness of the sample. The effective inverse capacitance determines the effective penetration depth. It is found that the capacitance exhibits a jump at the surface critical field. An experiment is suggested for determining the change in the effective capacitance of the layer.

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。

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