Abstract
We have studied the effect of Fe for Mn substitution on magnetic properties of NdMn1−xFexO3+δ compounds. Our heat capacity, AC susceptibility and magnetization measurements revealed that the transition from paramagnetic to magnetically ordered state of the Mn sublattice decreases linearly from TN=74.9K to TN=49K with doping up to x=0.25. The ordering temperature T1 of Nd sublattice varies in a non-monotonous way in the temperature range 11–16K. For x=0.3, the ordering of the Mn/Fe sublattice is residual, while the magnetism in Nd sublattice seems to be intact. The broad maximum in heat capacity C(T) at about 10K was ascribed by 2-level Schottky contribution (Δ=21(1)K) for x=0, but this description failed for Fe-doped samples. An upturn of C(T) at temperatures below 0.5K was observed on NdMnO3 and can be accounted to nuclear contribution. A more detailed study of AC susceptibility performed on samples with x=0.1 and 0.2 revealed a shift of both peaks to higher temperature with increasing frequency. The compensation temperature and a large negative field-cooled magnetization was observed for concentrations x=0.2 and x=0.25.
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