Magneto-caloric effect in Pb₂CoUO₆ with the second-order phase transition

Theoretically, the magnetic behaviours and the magneto-caloric performance of the Pb₂CoUO₆ double perovskite were predicted and examined. The results attained in this paper showed that the Pb₂CoUO₆ double perovskite was a ferromagnetic state under Tc ~ 10 K. The order magnetic transition of this system was a second-order from the ferromagnetic (FM) to the paramagnetic (PM) transition above Tc. The Pb₂CoUO₆ double perovskite was a hard magnetic material. Additionally, other physical quantities were determined and examined; namely, the magnetic entropy change (-Δ_SM) and the relative cooling power (RCP), which were 4.38 J kg^-1 K^-1 and 25.47 J kg^-1, respectively, at the applied magnetic field of 4 T. All these physical quantities were examined using the Monte Carlo approach (MCA). (author)