Magnetic critical behavior and room temperature magnetocaloric effect in Ba1.9Pr0.1FeMoO6 double perovskite compound

Abstract

In this paper, we report the critical behavior related to the magnetocaloric effect of Ba1.9Pr0.1FeMoO6 double perovskite. A maximum magnetic entropy change, |ΔSMmax| ∼ 0.68 Jkg−1K−1 and relative cooling power, RCP ∼ 62 Jkg−1 were observed under applied field of H = 2.5 T. The critical exponents were evaluated by using modified Arrott plots, Kouvel-Fisher, critical isotherm analysis and Widom scaling relation methods. A second order phase transition (paramagnetic to ferromagnetic) was observed at Curie temperature, TC = 319.73 K with critical exponents β = 0.45, γ = 0.84, and δ = 2.91. The value of these critical exponents shows that this sample obeys mean field model and Widom scaling relation. Also, we observed that the different isothermal magnetization data are able to collapse into the two branches below and above TC based on the single scaling equationM(H,ε)=εβf±(H/εβ+γ) that affirms the authenticity of the critical exponents.