Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 47: Superconductivity: Properties and Electronic Structure 2
TT 47.5: Vortrag
Mittwoch, 22. März 2017, 16:15–16:30, HSZ 103
Detailed analysis of magnetization loops of electrospun non-woven superconducting fabrics — •XianLin Zeng1, Denis Gokhfeld2, Thomas Karwoth1, Michael Koblischka1, Thomas Hauet3, and Uwe Hartmann1 — 1Institute of Experimental Physics, Saarland University, Campus C 6 3, D-66123 Saarbrücken, Germany — 2Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, 660036 Russia — 3Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, 660036 Russia
Networks of superconducting Bi2Sr2CaCu2O8 (Bi-2212) nanowires were fabricated by the electrospinning technique. The nanowires form a non-woven, fabric-like network with numerous interconnects enabling a current flow between the nanowires. The porosity of this nanowire network is 0.9928. Therefore, this material represents a novel class of ultraporous high-temperature superconductors. The magnetization of the nanowire networks were recorded by SQUID magnetometry. The magnetic properties were analyzed using the extended critical state model (ECSM). Single nanowires have remarkably high values of the critical current density of 1.69×107 A/cm2 at 5 K. The resulting sample critical current density of 7.44×104 A/cm2 at 5 K is fine for this lightweight material. Using the ECSM, several important magnetic parameters could be determined including the penetration field, Hp, the irreversibility fields, Hirr, the upper critical field, Hc2, and the flux pinning forces.