Preparation of granular Bi-2212 nanowires by electrospinning

<!-- START_ABSTRACT --> <p> Superconductivity in alkali metal intercalated iron selenides A Krzton-Maziopa, V Svitlyk, E Pomjakushina et al. Exploration of new superconductors and functional materials, and fabrication of superconducting tapes and wires of iron pnictides Hideo Hosono, Keiichi Tanabe, Eiji Takayama-Muromachi et al. Granular behavior observed in the polycrystalline superconducting LiFeAs Abstract Bi 2 Sr 2 CaCu 2 O 8 (Bi-2212) superconducting nanowires are synthesized by the electrospinning method. Two different precursors were employed to grow the nanowires, a Pb-doped one and a Cu,Ca-enriched one. The granular polycrystalline character was confirmed by scanning electron microscopy and x-ray diffraction measurement. The magnetic and electric properties of the samples were investigated via SQUID magnetometry and four-probe resistance measurements. The superconducting transition temperatures of the two systems were found to be similar (Pb-doped 84 K, Cu,Ca-enriched 76 K), but the transition width and the onset of irreversibility were clearly different. The magnetization loops and the resistance data demonstrate that the Cu,Ca-enriched precursor yields samples with better superconducting properties. </p> <!-- END_ABSTRACT --> <!-- START_TEMPLATE --> <ul> <li> Source: </li> <li> Tags: </li> </ul> <!-- END_TEMPLATE -->