Phenomenological model of the magnetocaloric effect on Nd0.7Ca0.15Sr0.15MnO3 compound prepared by ball milling method

The Nd0.7Ca0.15Sr0.15MnO3 (NCSMO) compound have been prepared by ball milling method during 4 h. The structural study showed that our synthesized compound is single phase and crystallize in the orthorhombic system with Pnma space group. Based on a phenomenological model, magnetocaloric properties of NCSMO compound have been studied. According to this model, we have calculated the values of the magnetic entropy change, the full width at half-maximum, the relative cooling power and the magnetic specific heat change for our compound. The maximum magnetic entropy change (−ΔSMmax), the relative cooling power (RCP) and the refrigerant capacity (RC) are found to be 3.16 J Kg−1 K−1, 306.08 J Kg−1 and 258.41 J Kg−1 for a magnetic field of 5 T respectively. The results indicate that the compound could be considered as a candidate for use in magnetic refrigeration at low temperatures. The present sample shows that a collapse of the magnetic entropy change curves to a master curve, confirms the second order nature of the phase transition.