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arXiv 0802.3710cond-mat.supr-concond-mat.str-el
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层状超导体中的顺磁本征迈斯纳效应

Paramagnetic Intrinsic Meissner Effect in Layered Superconductors

A. G. Lebed

摘要:

利用Gor'kov方程计算了平行磁场中含$ξ_{\perp} < d$的层状超导体的自由能,其中$ξ_{\perp}$为垂直于层的相干长度,$d$为层间距离.自由能示出不同的教科书劳伦斯-多尼亚克模型在高场,迈斯纳电流被发现创建一个意想不到的正磁矩由于收缩的库珀对“大小”的磁场。这种顺磁性的内在迈斯纳效应在散装建议检测面内扭矩,上临界场,并在层状有机和高T $_c$超导体以及超导超晶格的磁化强度。

英文摘要:

Free energy of a layered superconductor with $ξ_{\perp} < d$ is calculated in a parallel magnetic field by means of the Gor'kov equations, where $ξ_{\perp}$ is a coherence length perpendicular to the layers and $d$ is an inter-layer distance. The free energy is shown to differ from that in the textbook Lawrence-Doniach model at high fields, where the Meissner currents are found to create an unexpected positive magnetic moment due to shrinking of the Cooper pairs "sizes" by a magnetic field. This paramagnetic intrinsic Meissner effect in a bulk is suggested to detect by measuring in-plane torque, the upper critical field, and magnetization in layered organic and high-T$_c$ superconductors as well as in superconducting superlattices.

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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