Abstract
The magnetic properties of stoichiometric Nd 2NiO 4 have been investigated by means of dc and ac magnetic susceptibility and isothermal magnetization measurements. Five different magnetic phase transitions have been identified and characterized. A collinear antiferromagnetic ordering of Ni 2+ magnetic moments exists between T N1 ≈ 330 K and T C1 ≈ 130 K where an orthorhombic-to-tetragonal (Bmab to P4 2/ncm) structural phase transition takes place. A weak ferromagnetic component appears below 130 K and an additional out-of-plane component of the internal magnetic field on the Nd 3+ ions develops with this structural phase transition and strongly polarizes these ions. Two additional transitions are observed at T C2 ≈ 68 K and T C3 ≈ 45 K which are characterized by a sudden increase in the weak ferromagnetic component and in the corresponding internal magnetic field acting on the Nd ions. A field-induced transition, characteristic of a metamagnetic-like transition of the Nd-Ni weak ferromagnetic components has also been identified.
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