Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 98: Poster Session: Superconductivity
TT 98.7: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
Characterization of Bi2Sr2CaCu2O8 thin film and nanowire networks synthesized from sol-gel precursor — •XianLin Zeng1, Fabian Laurent1, Thomas Karwoth1, Michael Koblischka1, Crosby Chang2, Thomas Hauet2, and Uwe Hartmann1 — 1Institute of Experimental Physics, Saarland University, Campus C 6 3, D-66123 Saarbrücken, Germany — 2Institut Jean Lamour, UMR CNRS-Université de Lorraine, 54506 Vandoevre-lès-Nancy, France
Thin films on SrTiO3 substrates and substrate-free networks of superconducting Bi2Sr2CaCu2O8 (Bi-2212) were fabricated using the spin coating method and the electrospinning technique. To enable a comparison of the superconductivity of the two-dimensional and one-dimensional materials, both samples are prepared from the same sol-gel precursor. The morphologic characterization was done by scanning electron microscopy (SEM). The phases were confirmed by X-Ray diffraction (XRD). The magnetic properties characterized from SQUID measurements show that the nanowire samples have a lower Tc than the respective thin film samples. The electric properties reveal further differences. A double-step behavior in the R(T) curves and an obvious residual resistance in the superconducting regime in the U(I) curves were found for the nanowire samples. The hysteretic effect of the nanowire network sample is much weaker than in the thin film sample, and it vanishes at weak fields (0.6 T). This work is part of DFG-project Ko2323/8.