Study on the influence of magnetic phase transitions on the magnetocaloric effect in Sm0.7Sr0.3Mn0.95Fe0.05O3 manganite

Abstract In this work, the structural, magnetic, magnetocaloric effect (MCE) and refrigerant capacity (RC) properties of nanosize Sm 0.7 Sr 0.3 Mn 0.95 Fe 0.05 O 3 manganite have been investigated. Structural characterization shows that this sample has orthorhombic (Pbnm) phase with the small impurities (Mn 3 O 4 ). The sample undergoes second order paramagnetic to ferromagnetic transition at T C  = 90 K followed by two types of magnetic states at T T C , which is formed by the presence of second order charge ordered at T CO  = 28 and first order antiferromagnetic clusters at T N  = 18 K. The magnetic entropy change Δ S M changes from negative around T C to positive around T CO and T N indicating the presence of normal and inverse MCEs. The influence of first and second order magnetic phase transitions on the MCE and RC are reported.