Berlin 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.26: Poster

Mittwoch, 28. März 2012, 15:00–19:00, Poster B

High-field and low-temperature study of the nanostructured ferromagnetic superconductor Bi₃Ni — •Thomas Herrmannsdörfer¹, Richard Skrotzki^{1, 2}, Rico Schönemann¹, Iurii Scurschii¹, Jochen Wosnitza¹, Daniel Köhler², Regine Boldt³, and Michael Ruck² — ¹Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, Dresden — ²Department of Chemistry and Food Chemistry, TU Dresden, Dresden — ³Leibniz Institute of Polymer Research, Dresden

We have demonstrated the coexistence of superconductivity and ferromagnetism in Bi₃Ni nanostructures which have been prepared by making use of novel chemical-reaction paths [1]. Here, we present recent experiments on novel nanostructures, such as monodisperse spherical clusters with a diameter of 8 nm as well as nanofibers. We have investigated their magnetic and electrical-transport properties by means of SQUID magnetometry, pulsed-field susceptometry, and ac-resistance measurements in a wide field and temperature range. Pulsed-field susceptibility data up to 60 T allow for a determination of the saturation magnetization of Bi₃Ni nanostructures. Resistivity measurements performed on moderately compacted Bi₃Ni nano fibers down to sub-Kelvin temperatures have shown clear evidence for the existence of an isosbestic point. These results will be presented in the context of a coexistence of superconductivity and ferromagnetism. Part of this work was supported by EuroMagNET, EU-contract No. 228043.
T. Herrmannsdörfer, R. Skrotzki, J. Wosnitza, D. Köhler, R. Boldt, M. Ruck, Phys. Rev. B 83, 140501 (R) (2011).