Microstructure and paramagnetic Meissner effect of YBa2Cu3Oy nanowire networks
Microstructure and paramagnetic Meissner effect of YBa2Cu3Oy nanowire networks
复制标题
DOI：
10.1007/s11051-020-05076-2
复制
发表时间：
2020-11
影响因子：
2.5
通讯作者：
A. L. Pessoa;A. Koblischka-Veneva;C. Carvalho;R. Zadorosny;M. Koblischka
中科院分区：
文献类型：
--
作者：
A. L. Pessoa;A. Koblischka-Veneva;C. Carvalho;R. Zadorosny;M. Koblischka
报道了非织造织物状 YBa2Cu3Oy(YBCO) 纳米纤维垫的微观结构和磁性特征。样品是通过溶液吹纺 (SBS) 生产的，从前体材料在聚乙烯吡咯烷酮中的溶胶-凝胶溶液开始。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了形态表征，并通过磁力测量法测量了超导性能。一个有趣的特征是场冷却时出现顺磁迈斯纳效应 (PME)，这一特征首次在此类样品中得到验证。 PME 仅出现在非常小的外加磁场中，这与之前在人造颗粒 YBCO 薄膜上观察到的 PME 类似，但与文献中研究的块状样品明显不同。因此，我们通过纳米纤维垫的纳米孔结构的空隙内的通量捕获来解释 PME。图解 YBCO 纳米纤维垫 (a) 和人造颗粒 YBCO 薄膜 (b) 在各种应用磁场中的顺磁迈斯纳效应。
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.Graphical AbstractThe paramagnetic Meissner effect in various applied magnetic fields for the YBCO nanofiber mats (a) and the artificially granular YBCO thin film (b).