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Microstructure and paramagnetic Meissner effect of YBa 2 Cu 3 O y nanowire networks
Journal of Nanoparticle Research ( IF 2.5 ) Pub Date : 2020-11-26 , DOI: 10.1007/s11051-020-05076-2
A. L. Pessoa , A. Koblischka-Veneva , C. L. Carvalho , R. Zadorosny , M. R. Koblischka

The microstructure and magnetic characterizations of non-woven, fabric-like YBa2Cu3Oy (YBCO) nanofiber mats are reported. The samples were produced by solution blow spinning (SBS), starting from a sol-gel solution of the precursor materials in polyvinylpyrrolidone. In the present work, the nanowire network samples were morphologically characterized by scanning electron microscopy, and the superconducting properties were measured by magnetometry. An interesting feature is the appearance of a paramagnetic Meissner effect (PME) when field-cooling, firstly verified in that sort of sample. The PME appears only in very small applied magnetic fields, which is similar to previous observations of the PME on an artificially granular YBCO thin film, but distinctly different from bulk samples investigated in the literature. Thus, we explain the PME by flux trapping within the voids of the nanoporous structure of the nanofiber mats.



中文翻译:

YBa 2 Cu 3 O y纳米线网络的微观结构和顺磁Meissner效应。

非织造织物状YBa 2 Cu 3 O y的微观结构和磁性(YBCO)纳米纤维垫。通过溶液吹塑(SBS)从前体材料在聚乙烯吡咯烷酮中的溶胶-凝胶溶液开始制备样品。在目前的工作中,通过扫描电子显微镜对纳米线网络样品进行形态学表征,并通过磁力分析法测量其超导性能。一个有趣的特征是在现场冷却时出现顺磁性迈斯纳效应(PME),该现象首先在这种样品中得到验证。PME仅出现在很小的外加磁场中,这与以前在人工颗粒状YBCO薄膜上对PME的观察相似,但与文献中研究的大量样品有明显不同。因此,我们通过通量捕获在纳米纤维垫的纳米孔结构的空隙中来解释PME。

更新日期:2020-11-27
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