Abstract
Magnetization, AC susceptibility and specific heat measurements were performed on polycrystalline NdMn1-xFexO3+δ compounds (x = 0.0, 0.1 and 0.2). Substitution of Fe for Mn reduces the Néel temperature TN, which is associated with magnetic ordering of Mn sublattice, from 85.5 K to 57.0 K. The temperature dependence of magnetization for x = 0.2 exhibits the compensation temperature and the pole inversion below Tcomp = 26.7(5) K. Initial magnetization curves present a remnant magnetization in the ordered region with the sign of remnant magnetization depending on temperature. The substitution of Fe for Mn changes hysteresis loop of NdMnO3+δ from the ferromagnetic-like one (μ0Hc = 0.09 T) by expanding the width of the loop (μ0Hc = 0.55 T) for x = 0.1 and then shrinking the central part of the loop to “butterfly” type (μ0Hc = 0.35 T) for x = 0.2.
Highlights
Our textured polycrystalline samples were prepared by floating zone method in a mirror furnace
Considering known magnetic properties of parent compounds one could suggest that Fe substitution for Mn in NdMnO3 will raise the TN to higher temperatures, but T1 will decrease
The starting materials were mixed, cold pressed into the rods and sintered at 1200 °C for 24 hours in air
Summary
Our textured polycrystalline samples were prepared by floating zone method in a mirror furnace. In our work we study effect of Fe for Mn substitution on NdMn1-xFexO3+ polycrystalline compounds. In both compounds the Nd and Mn/Fe sublattices order magnetically [8, 9].
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