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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.16: Poster

Montag, 31. März 2014, 15:00–19:00, P2

Superconductivity and ferromagnetism in nanostructured Bi₃Ni — •R. Schönemann¹, T. Herrmannsdörfer¹, 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, Germany — ²Department of Chemistry and Food Chemistry, TU 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 novel nanostructures, such as supercrystals consisting of packed Bi₃Ni nanofibers. We have investigated their magnetic and electrical-transport properties by means of XMCD, SQUID magnetometry, pulsed-field susceptometry, and ac-resistance measurements in a wide field and temperature range. Resistivity measurements demonstrate that superconductivity persists well above the Pauli limiting field - with strong anisotropy. These results will be presented in the context of a coexistence of superconductivity and ferromagnetism.

Part of this work was performed at the NHMFL and ESRF beamline ID08.
T. Herrmannsdörfer, R. Skrotzki, J. Wosnitza, D. Köhler, R. Boldt, M. Ruck, Phys. Rev. B 83, 140501 (R) (2011).