Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

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.