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We perform a comparative magnetic study on two series of rare-earth (RE)based double perovskite iridates RE2BIrO6 (RE=Pr,Nd,Sm-Gd;B=Zn,Mg), which showMott insulating state with tunable charge energy gap from ~330 meV to ~560 meVby changing RE cations. For nonmagnetic RE=Eu cations, Eu2MgIrO6 showsantiferromagnetic (AFM) order and field-induced spin-flop transitions belowN\'eel temperature (TN) in comparison with the ferromagnetic (FM)-likebehaviors of Eu2ZnIrO6 at low temperatures. For magnetic-moment-containing REions, Gd2BIrO6 show contrasting magnetic behaviors with FM-like transition(B=Zn) and AFM order (B=Mg), respectively. While, for RE=Pr, Nd and Sm ions,all members show AFM ground state and field-induced spin-flop transitions belowTN irrespective of B=Zn or Mg cations. Moreover, two successive field-inducedmetamagnetic transitions are observed for RE2ZnIrO6 (RE=Pr,Nd) in high field upto 56 T, the resultant field temperature (H-T) phase diagrams are constructed.The diverse magnetic behaviors in RE2BIrO6 reveal that the 4f-Ir exchangeinteractions between the RE and Ir sublattices can mediate their magnetism.

A comparative study on magnetic order and field induced magnetic  transition on two series of double perovskite iridates RE2BIrO6  (RE=Pr,Nd,Sm,Eu,Gd B=Zn,Mg)