Berlin 2015 – wissenschaftliches Programm

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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. Skrotzki1,2, M. Kaiser2, M. Heise2, M. Ruck2, K. Kummer3, D. Graf4, and J. Wosnitza11Dresden 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).

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