Abstract
A magnetic study of perovskites RMnO3+x (R = Nd, Eu, Gd, Tb, Dy) is reported. The compounds NdMnO2.99 and EuMnO2.99 are weak ferromagnets with TN=88 and 49 K respectively. It is shown that GdMnO3 undergoes a transition from antiferromagnetic to weak ferromagnetic state upon cooling. The antiferromagnetic ordering of the magnetic moments in the Gd sublattice is observed below 6 K. The magnetic moments of TbMnO3.01 and DyMnO3.01 are ordered below 7 K. The external field induces an antiferromagnet–ferromagnet transition in the rare-earth sublattice. The critical fields for GdMnO3,TbMnO3.01, and DyMnO3.01 are 5, 10, and 7 kOe, respectively.
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