Berlin 2015 – wissenschaftliches Programm

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

TT: Fachverband Tiefe Temperaturen

TT 21: Superconductivity: Poster Session

TT 21.9: Poster

Montag, 16. März 2015, 15:00–18:00, Poster B

Superconductivity and ferromagnetism in nanostructured Bi₃Ni — •R. Schönemann¹, T. Herrmannsdörfer¹, H. Kühne¹, Z. Zhang¹, M. Naumann¹, R. Skrotzki^1,2, M. Kaiser², M. Heise², M. Ruck², K. Kummer³, D. Graf⁴, and J. Wosnitza¹ — ¹Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ²Department of Chemistry and Food Chemistry, TU Dresden, Dresden, Germany — ³European Synchrotron Radiation Facility (ESRF), Grenoble, France — ⁴National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida, USA

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 new nanostructures, such as supercrystals consisting of packed Bi₃Ni nanofibers. We have investigated their structural, magnetic and electrical-transport properties by means of NMR, XMCD, SQUID magnetometry and ac-resistance measurements. In agreement with x-ray diffraction experiments, the ²⁰⁹Bi NMR spectra indicate a distribution of local structural parameters in the Bi₃Ni nano fibres. While bulk Bi₃Ni is nonmagnetic, XMCD measurements on nanostructured Bi₃Ni indicate a magnetic 3d⁸ configuration of Ni. Resistivity measurements demonstrate that superconductivity persists well above the Pauli limiting field - with strong anisotropy.

[1] T. Herrmannsdörfer, R. Skrotzki, J. Wosnitza, D. Köhler,

R. Boldt, M. Ruck, Phys. Rev. B 83, 140501 (R) (2011).