Impact of rare earth magnetic moment on ordering of Ru in Sr2RuREO6 (RE=Gd and Eu)

Abstract We report the synthesis and magnetization of Sr 2 RuREO 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 .