Microstructural and magnetic characterizations of YBa ₂ Cu ₃ O _7−δ nanowire fabric-like samples were performed. Fabric-like ceramic superconductors are nanoporous materials and can be applied, e.g., in magnetic shielding, since the porous morphology makes them extremely light-weight and effectively to be cooled. The samples were produced by the solution blow spinning (SBS) technique, starting from a sol-gel solution of the precursor materials in polyvinyl-alcohol. The morphology of the samples was characterized by scanning electron microscopy, transmission electron microscopy, and x-ray diffraction with the aim to analyze the possible current paths. The magnetic hysteresis loops revealed typical polycrystalline behavior, and field-cooling in various small applied fields shows the presence of the paramagnetic Meissner effect (PME), but in a distinctly different way as compared to melt-texured Bi ₂ Sr ₂ CaCu ₂ O _8+δ or Nb.

中文翻译：

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YBCO纳米纤维垫中的顺磁迈斯纳效应和电流

YBa ₂ Cu ₃ O _7−δ的微观结构和磁学表征 进行了纳米线织物样样品。织物状的陶瓷超导体是纳米多孔材料，并且可以应用于例如磁屏蔽中，因为其多孔形态使其非常轻便并且可以有效地冷却。样品是通过溶液吹塑（SBS）技术从前体材料在聚乙烯醇中的溶胶-凝胶溶液开始制备的。通过扫描电子显微镜，透射电子显微镜和X射线衍射对样品的形貌进行表征，以分析可能的电流路径。磁滞回线显示出典型的多晶行为，并且在各种小的应用场中的场冷却显示了顺磁迈斯纳效应（PME）的存在，但与熔融纹理化的Bi相比有明显不同的方式 ₂ Sr ₂ CaCu ₂ O _{8 +δ}或Nb。