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Gao, Yuxia; Tian, Zhaoming; Xu, Longmeng; Ashtar, Malik; Wan, Zongtang; Xia, Zhengcai; Yang, Feng; Yuan, Songliu; Han, Yuyan; Tong, Wei
Journal of physics. Condensed matter, 11/2020, Letnik: 32, Številka: 46Journal Article
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 show Mott insulating state with tunable charge energy gap from ∼330 meV to ∼560 meV by changing RE cations. For nonmagnetic RE = Eu cations, Eu2MgIrO6shows antiferromagnetic (AFM) order and field-induced spin-flop transitions below Néel temperature (TN) in comparison with the ferromagnetic (FM)-like behaviors of Eu2ZnIrO6at low temperatures. For magnetic-moment-containing RE ions, Gd2BIrO6show 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 belowTNirrespective of B = Zn or Mg cations. Moreover, two successive field-induced metamagnetic transitions are observed for RE2ZnIrO6(RE = Pr, Nd) in high field up to 56 T, the resultant field temperature (H-T) phase diagrams are constructed. The diverse magnetic behaviors in RE2BIrO6reveal that the 4f-Ir exchange interactions between the RE and Ir sublattices can mediate their magnetism.
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