Study of magnetocaloric properties of small Bi-doped Pr0.55Ca0.05Ba0.40Mn1−xBixO3 manganites

Abstract

Here, we investigated the magnetic and magnetocaloric (MC) properties of manganites labeled PrCaBaMnO and PrCaBaMnBiO, with compositions Pr0.55Ca0.05Ba0.40Mn1−xBixO3 (x = 0 and 0.02), respectively. The solid-state reaction method was used for sample preparation, and the structural properties were checked using X-ray diffraction (XRD). Temperature dependence of magnetization (M(T)) measurements was carried out in the range of 5–300 K under 100 Oe field to determine the transition temperature of the manganites. Magnetic entropy change ($$-\Delta {S}_{\text{M}}$$ - Δ S M ) values were computed from field-dependent magnetization (M(H)) measurements. For the 2 T magnetic field values, the $$-\Delta {{S}_{ }}_{\text{M}}^{\text{max}}$$ - Δ S M max values for the PrCaBaMnO and PrCaBaMnBiO manganites are 3.15 and 2.86 Jkg-1K-1, respectively. Relative Cooling Power (RCP) values were calculated from the temperature dependence of $$-\Delta {S}_{\text{M}}$$ - Δ S M (T) curves, resulting in 82.4 and 88.6 Jkg-1 for PrCaBaMnO and PrCaBaMnBiO, respectively. Banerjee’s criterion and Franco’s universal master curve confirmed that the transition type for the studied manganites is second order.