Abstract
Structural and magnetic properties of La0.62Er0.05Ba0.33Fe0.2Mn0.8O3 (LEBFMO) compound have been investigated. Rietveld refinement of powder X-ray diffraction data reveals that the sample crystallizes in the rhombohedral (R3¯c) structure. The dc and ac magnetic studies demonstrate aspects of Griffiths phase-like behavior above the Curie temperature. The observed anomalous paramagnetic behavior is attributed to the magnetic heterogeneity which is caused by the segregation of short-range ferromagnetic clusters within the paramagnetic matrix. A large deviation is usually observed between zero fields cooled (ZFC) and field cooled (FC) M(T) at a low temperature below the blocking temperature. At 50K a spin-glass state is seen to arise from a ferromagnetic state. This is caused by the competition between the ferromagnetic and antiferromagnetic interaction. From isothermal magnetization versus magnetic applied field, we deduced the magnetic entropy change ΔSM. The large RCP and ΔSM found in Fe-substituted sample are found to be interesting for magnetic refrigeration below room temperature.
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