Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.31: Poster
Montag, 14. März 2011, 14:00–18:00, P4
Coexistence of ferromagnetism and superconductivity in Bi3Ni nanostructures — •Thomas Herrmannsdörfer1, Richard Skrotzki1, Rico Schönemann1, Joachim Wosnitza1, Daniel Köhler2, Regine Boldt3, and Michael Ruck2 — 1Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), D-01328 Dresden, Germany — 2Department of Chemistry and Food Chemistry, TU Dresden, D-01062 Dresden, Germany — 3Leibniz Institute of Polymer Research, D-01069 Dresden, Germany
Materials where superconductivity emerges in an already ferromagnetic orderd phase are explicitly rare. Here we demonstrate that Bi3Ni nanostructures exhibit a coexistence of superconductivity and ferromagnetism by making use of novel chemical-reaction paths. Via magnetometry and electrical-transport measurements we have characterized their magnetic and superconducting properties. Other than in bulk geometry, submicron-sized particles and quasi one-dimensional nanoscaled strains of single-phase Bi3Ni undergo ferromagnetic order and still become superconducting at lower temperatures. Furthermore superconductivity is also stable up to remarkably high magnetic fields. Uniquely, ferromagnetic hysteresis at zero resistance is observed in nanostructured Bi3Ni. An extended study of electronically confined intermetallics may bear the chance to find much more systems which exhibit coexistence phenomena of fundamental ground states of condensed matter.