Behavior of the magnetocaloric effect in La 0.7 Ba 0.2 Ca 0.1 Mn 1-x Sn x O 3 manganite oxides as promising candidates for magnetic refrigeration

Abstract The magnetocaloric effect along with magnetic phase transition in the peroveskite polycrystalline samples La 0.7 Ba 0.2 Ca 0.1 Mn 1-x Sn x O 3 (x = 0 and 0.1) was investigated. The samples were synthesized using conventional solid state reaction at 1400 °C temperature. Magnetization vs. temperature measurements, under a magnetic field of μ 0 H = 0.05 T, showed a paramagnetic-ferromagnetic transition at Curie temperature, T C , which decreases from 310 K for x = 0–290 K for x = 0.1. A large magnetic entropy change | Δ S M | deduced from isothermal magnetization curves, has been observed in our samples with a peak centered on their respective T C . Interesting values of the relative cooling power (RCP), 237 J kg -1 for x = 0 and 248 J kg -1 x = 0.1, make these samples promising candidates for magnetic refrigeration around room temperature.