Abstract
We report the synthesis and magnetization of Sr 2RuREO 6 (RE/Ru-211O 6) with RE=Gd and Eu. Both Gd and Eu/Ru-211O 6 are formed in distorted perovskite-type single phase with monoclinic P2 1/n space group. Magnetization ( M/ T) measurements exhibited antiferromagnetic ordering of Ru moments for both Gd and Eu compounds at a T N of around 30 K due to super-exchange Ru–O–O–Ru interaction. Interestingly enough, detailed M/ H plots of Gd/Ru-211O 6 exhibited the development of a ferromagnetic (FM) component at 20 K. Furthermore, below 10 K, the FM component disappears, and rather spin freezing field ( H SF) of around 1000 Oe is seen at 5 K. In case of Eu/Ru-211O 6, the basic antiferromagnetic ordering of Ru moments remains invariantly down to 5 K, and the appearance of the FM component is not seen. It seems that the high magnetic moment of 8 μ B for Gd 3+ influences the anti ferromagnetic (AFM) ordering of Ru in case of Gd/Ru-211O 6.
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