Magnetocaloric effect in PrGd_1-xBa_xMn₂O₆ (0.0 ≤ x ≤ 1.0) double perovskite manganite system

The PrGd_1-xBa_xMn₂O₆ (x = 0.0, 0.6, 0.7, 0.8, 0.9, 1.0) double-perovskite manganite samples produced by solid-state reaction method have been investigated in this study. The samples were crystallized in the form of orthorhombic structure with the Pbnm space group confirmed by the Rietveld refinement method. The temperature-dependent magnetization measurements (M(T)) revealed that the samples display a phase transition from ferromagnetic to paramagnetic as temperature increased. The results obtained from these measurements indicate that the Curie temperature values increased from 44 to 187.8 K, respectively, by increasing the Ba concentration from x = 0.0–1.0. The isothermal magnetization curves are achieved by external magnetic field-dependent magnetization measurements (M(H)) and help to calculate the magnetic entropy change (− ΔS_M) values, and to find the nature of magnetic phase transition. Maximum magnetic entropy change (\(-\Delta {S}_{M}^{max}\)) values are found as 2.81, 2.76, 2.99, 3.44, 2.77, and 2.14 Jkg⁻¹ K⁻¹ under 5 T magnetic field change for x = 0.0, 0.6, 0.7, 0.8, 0.9, 1.0 samples, respectively. Arrott plots created from the isothermal magnetization curves show that all samples have a second-order magnetic phase transition. Relative cooling power values are determined as 103.41, 264.96, 341.19, 278.36, 224.13, and 164.42 Jkg⁻¹ for x = 0.0, 0.6, 0.7, 0.8, 0.9, 1.0 samples, respectively.