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arXiv 0901.0666cond-mat.supr-con
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Pb/Co纳米复合材料的超导转变:Co体积分数和外加磁场的影响

Superconducting transition in Pb/Co nanocomposites: effect of Co volume fraction and external magnetic field

Y. T. Xing, H. Micklitz, T. G. Rappoport, W. A. Rodrigez, E. Baggio-Saitovitch

摘要:

制备了嵌有均匀分布的钴(Co)纳米颗粒(平均尺寸为4.5 nm)的Pb薄膜。先前的输运研究表明,Co粒子在零外部磁场中在超导转变温度(T $_{c}$)以下诱导自发涡旋。本文详细研究了Co体积分数和外加磁场对复合材料超导转变的影响。在T $_c$ -减少之间的制备和退火样品的大的差异可以归因于不同的超导相干长度和由此产生的不同直径的自发涡旋在这些样品。

英文摘要:

Pb films embedded with homogeneously distributed cobalt (Co) nanoparticles (mean size 4.5 nm) have been prepared. Previous transport investigations have shown that Co particles induce spontaneous vortices below the superconducting transition temperature (T$_{c}$) in zero external magnetic field. In this paper we study in detail the influence of the Co volume franction and an external magnetic field on the superconducting transition in such composites. The large difference in T$_c$-reduction between the as-prepared and annealed samples can be attributed to the different superconducting coherence lengths and the resulting different diameters of the spontaneous vortices in these samples.

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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