Abstract
Structural, magnetic and magnetocaloric properties of La0.7Sr0.1Ca0.2Mn1−xCrxO3 compounds with x=0, 0.05 and 0.1 have been investigated to shed light on Cr-doping influence. X-ray diffraction studies show that all samples crystallize in the rhombohedral symmetry with R3¯c space group. Rietveld refinement structure shows that the insertion of Cr in Mn network modifies the structural parameters such as the volume, Mn–O–Mn angles and the Mn–O bond length. The substitution of Mn by Cr decreases the 2p-3d hybridization between O and Mn ions, reduces the bandwidth and increases the electron–phonon coupling. The investigation of magnetic and magnetocaloric properties reveals that the samples exhibit a paramagnetic(PM)–ferromagnetic (FM) transition with decreasing Curie temperature (TC) from 294K to 255K when Cr doping level increases. The magnetic entropy change ΔSMmax also decreases from 6.20Jkg−1K−1 for x=0 to3.80Jkg−1K−1 for x=0.1, while the relative cooling power (RCP) increases from 234.5 to 240Jkg−1, respectively, under a magnetic field of 5T. These outcomes suggest that Mn-site Cr doping inhibits the enhancement of the magnetocaloric effect in some perovskite manganites. This is explained by the weakening of the ferromagnetic double-exchange interaction between Mn3+ and Mn4+ ions.
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