Magnetocaloric effect and phase transition critical behavior of La0.75Sr0.25Mn0.9Co0.1O3 compound synthesized under the high pressure

In this study, a novel method is proposed for producing perovskite rare-earth manganese oxide magnetic refrigeration materials that exhibit superior properties compared to similar materials. The maximum magnetic entropy change values for this sample are 1.44 and 3.75 J<middle dot>kg(-1)<middle dot>K-1 for magnetic fields of 2 and 7 T, respectively. Additionally, its relative cooling power has been calculated to be 101.96 and 404.78 J<middle dot>kg(-1), indicating good performance. Both results were obtained using the sample synthesized under a pressure of 4 GPa, and the sample has undergone a second phase transition. The critical behavior of the sample fits well with the mean field model. For different magnetic fields, there is a significant overlap between the values of the maximum magnetic entropy change and the temperature-averaged entropy change, indicating that the refrigeration performance of the sample after high pressure can approach its maximum capability.