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arXiv 0810.2342cond-mat.supr-con
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具有各向异性电动力学的超导柱和球中的有效磁穿透深度

Effective magnetic penetration depth in superconducting cylinders and spheres with highly anisotropic electrodynamics

D. M. Broun, W. A. Huttema

摘要:

导出了各向异性球形和长圆柱形层状超导体的有效磁穿透深度和微波表面阻抗,其中在高导层平面内施加外部磁场以感应出平面外屏蔽电流。通过解析延拓将结果推广到高各向异性导体和高频有耗超导体。本文给出了具有任意各向异性的超导体或金属的一般情况下的电动力学。然后专门处理具有单轴各向异性的层状材料,其中垂直于层流动的电流的穿透深度λ_c远大于面内电流的穿透深度λ_a。在λ_a趋于零的极限范围内找到了精确解,并有望为铜酸盐和其他层状超导体,特别是晶粒取向粉末的许多实验提供精确的表示。

英文摘要:

Effective magnetic penetration depth and microwave surface impedance are derived for anisotropic layered superconductors in the shape of spheres and long cylinders, where the external magnetic field is applied in the plane of the highly conducting layers to induce out-of-plane screening currents. The results are extended by analytic continuation to highly anisotropic conductors and to lossy superconductors at high frequency. The electrodynamics for the general case of a superconductor or metal with arbitrary anisotropy are presented. The treatment is then specialized to layered materials with unixaxial anisotropy, in which the penetration depth for currents flowing perpendicular to the layers, lambda_c, is much greater than that for in-plane currents, lambda_a. Exact solutions are found in the limit lambda_a goes to zero, and are expected to provide an accurate representation of many experiments on cuprates and other layered superconductors, particularly on grain-aligned powders.

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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