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

Abstract

We report synthesis and magnetization of Sr 2 RuREO 6 (RE/Ru-211O 6 ) with RE = Gd and Eu. Both Gd,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 T N of around 30 K due to superexchange 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. Further at below 10 K, the FM component disappears and rather an 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 invariant down to 5 K, and the appearance of FM component is not seen. It seems that the high magnetic moment of 8µ B for Gd 3+ influences the AFM ordering of Ru in case of Gd/Ru-211O 6 .

Variable range hopping conduction and superconductivity in Ru-1222

“…The transition temperature and the nature of the transition in ruthenocuprate superconductor vary widely depending on the carrier concentration, magnetic ordering and disorder level [1][2][3][4][5][6][7][8][9]. In polycrystalline ruthenocuprate the dependence of the transition temperature and the width of transition on carrier concentration are even more complex because of the presence of the intergranular networks.…”