Abstract
In the present paper a comparative research study has been conducted on the magnetic and magnetocaloric response of the materials of A2Mn207 (A: Fe, Al and La) oxides. . The XRD refinement analysis suggests that the A2Mn207 oxides are crystallized in monoclinic structure with space group P2/m. The thermal evolution of the magnetization reveals a ferromagnetic transition and a presence of a Griffith's phase at low temperature. A2Mn207 oxides exhibit a clear correlation between the ionic radius rA3+, in the A-site, and the magnetic transition temperature and that of Griffiths. However, this correlation is not obvious for the value of the universal exponent λ. In addition, the current study reveals an increase in the Relative Cooling Power (RCP) value with a decrease in ionic radius. Furthermore, the magnetocaloric effect (MCE) value, has been found to be exploited over a wide temperature range by increasing the cationic radius rA3+.
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