Abstract
The present letter undertakes the analysis of the influence of the charge-ordering on the magnetic entropy change between La0.5Ca0.5MnO3 and La0.5Ca0.3Ag0.2MnO3 polycrystalline samples. The magnetic entropy change (ΔSM) of x=0 alters the sign from negative to positive with the decrease in temperature below the charge ordering. However, ΔSM is negative and exhibits a peak close to TC in Ag-doped samples. The large RCP and ΔSM found in Ag-substituted samples were found to be interesting for magnetic refrigeration below room temperature. The obtained results were discussed within the framework of charge ordering and its destruction with Ag substitution.
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