Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.36: Poster

Mittwoch, 14. März 2018, 15:00–19:00, Poster B

Magnetic ground state of the cubic perovskite Ba₃NiNb₂O₉ — •Sh. Yamamoto¹, G. Aslan Cansever², T. Gottschall¹, M. Uhlarz¹, C. G. F. Blum², A. Wolter-Giraud², S. Aswartham², S. Wurmehl², T. Herrmannsdörfer¹, S. Seiro², B. Büchner², and J. Wosnitza¹ — ¹Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — ²IFW-Dresden, Germany

We investigated the magnetic spin-1 perovskite Ba₃NiNb₂O₉ by means of complex ac susceptibility measurements at extreme sample conditions. Ba₃NiNb₂O₉ with cubic perovskite structure (Pm-3m) has a random occupation of Nb(66 %)/Ni(33 %) at the center of the cubic perovskite unit cell. Different from the isostoichiometric sister compound, Ba₃NiNb₂O₉ with P-3m1 structure which shows both uud-spin configuration and multiferroicity, the magnetic properties of the investigated system have not been studied below 2 K yet. For our single crystals, we observe a spin freezing transition at around 0.7 K. Furthermore, the peak of χ’ is suppressed by applying an external dc field of 200 mT and χ” shows a sudden onset near the freezing temperature.