Abstract
Magnetocaloric effect and critical exponent analysis of La0.8-xEuxSr0.2MnO3 (x = 0, 0.075) manganites synthesized via a solid state reaction route have been explored. Rietveld analysis indicates that crystal structure of La0.8-xEuxSr0.2MnO3 (for x = 0.0) is in orthorhombic structure with pbnm space group. After the substitution of Eu, the structure changes from orthorhombic (for x = 0.0) to rhombohedral structure for (x = 0.075) with R3¯c space group. The TC is 287 K and 271 K for the samples with x = 0.000 and x = 0.075, respectively, and the magnetic entropy change is 2.76J K − 1•kg−1 for x = 0.000 and 3.94J K − 1•kg−1 for x = 0.075. The real cooling power (RCP) is 447.7 J•kg−1 for the sample with x = 0.000 and 445 J•kg−1 for the samples with x = 0.075. Both samples show a second order phase transition in the vicinity of TC. The critical exponents were determined using modified Arrott plots and Kouvel-Fisher methods. The critical behavior of these two samples fit best with the mean field model.
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