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

Abstract

The complex magnetic materials La0.70 Ca0.1 Sr0.2 Fe0.1 Mn0.9 O3 (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.