Tuning magnetocaloric properties for La$_{1-x}$Sr$_x$CoO$_3$

Low magnetic field magnetocaloric (MC) properties of La$_{1-x}$Sr$_x$CoO$_3$ ($x$ = 0.3 and 0.5) near phase transition from a ferromagnetic to a paramagnetic state were investigated. It is shown that the change of Sr content allows MC effect in La$_{1-x}$Sr$_x$CoO$_3$ to be tunable, which is more practical for construction of MC refrigeration. MC properties of the $x$ = 0.5 sample are significantly greater than that of the $x$ = 0.3 one. Furthermore, the results show that MC properties of La$_{1-x}$Sr$_x$CoO$_3$ samples are significantly larger, and comparable with some MC properties of many materials like Gd$_{1 – x}$Ca$_x$BaCo$_2$O$_{5.5}$ and Ge$_{0.95}$Mn$_{0.05}$.