Abstract
A Series of LuMn1−xRuxO3 (0 ≤ x ≤ 0.3) samples were prepared by traditional solid-state reaction method. The interactions between Ru3+ (with 4d electrons) and Mn3+ (with 3d electrons) on the structure and magnetic properties of LuMn1−xRuxO3 were investigated. The results of structural investigation reveal that samples crystallize in a single hexagonal structure with P63cm group for LuMn1−xRuxO3 samples with x ≤ 0.1. The change of Mn–O bond lengths and Mn–O–Mn bond angles indicates the trimerization of Mn3+ ions is weakened and the tilting angle of MnO5 bipyramids is decreased. The temperature dependence on magnetization M(T) curves prove that weak ferromagnetism (FM) exists in the samples. Meanwhile, the antiferromagnetic (AFM) transition temperature TN of LuMn1-xRuxO3 samples is enhanced by the Ru doping. The weak FM is resulted from the alteration of frustrated magnetic structure, while the enhancement of AFM coupling is ascribed to the strong super-exchange Ru3+–O2−–Ru3+ and Ru3+–O2−–Mn3+ interaction by Ru3+ doping. This paper provides an important reference of 4d ion doping in LuMnO3.
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