Magnetocaloric response of La0.70Ca0.1Sr0.2Fe0.1Mn0.9O3 pervoskite for magnetic refrigeration

The complex magnetic materials La0.70Ca0.1Sr0.2Fe0.1Mn0.9O3 (LCSFMO) and La0.70Ca0.1Sr0.2MnO3 (LCSMO), applicable for the magnetic cooling, have been explored. The X-ray diffraction patterns show that these samples are in single phase with rhombohedral structure. A remarkable decrease in the Curie temperature from 346 to 223 K was observed for 10% of Fe doping at Mn-site in the LCSMO sample. The substitution of Mn by Fe results in a combination of doping disorder, a site-percolation and Mn–Fe super-exchange interactions, which suppresses the ferromagnetism. The maximum magnetic entropy change of 1.53 J kg−1 K−1 with field variation of 3 T was obtained for the LCSFMO sample. The relative cooling power (RCP) ∼120 J kg−1 was found for an applied magnetic field of 3 T. The comparable magnetic entropy change and RCP values suggested that the studied samples have potential as a refrigerant for cooling applications.