Pinning force scaling of electrospun Bi-2212 nanowire networks

Michael Rudolf Koblischka (1) , Denis Gokhfeld (2) , Crosby S Chang (3) , Thomas Hauet (3) , Uwe Hartmann (1)

1 Institute of Experimental Physics
2 Kirensky Institute of Physics
3 IJL - Institut Jean Lamour

Flux pinning forces were determined on different network samples of superconducting Bi Sr CaCu O 2 2 2 8 (Bi-2212) nanowires prepared by the electrospinning technique. We employed magnetization data determined by SQUID magnetometry in a wide temperature range 10 K T < < 35 K, where a strong superconducting signal prevails. The scaling analysis of the pinning forces was applied to interprete the data obtained. Both pure and Li-doped Bi2212 nanowire networks exhibit a peak position of h ∼ 0 0.11, which is smaller than the expected value of h = 0 0.2 indicating flux pinning at grain boundaries or extended defects. For the flowing currents through such a network, the crystallographic anisotropy and the percolation play an important role, resulting in reduced peak positions as compared to bulk samples.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Michael Rudolf Koblischka, Denis Gokhfeld, Crosby S Chang, Thomas Hauet, Uwe Hartmann. Pinning force scaling of electrospun Bi-2212 nanowire networks. Solid State Communications, 2017, 264, pp.16-18. ⟨10.1016/j.ssc.2017.07.002⟩. ⟨hal-01710779⟩