Study of magnetocaloric effect and critical exponents in polycrystalline La0.4Pr0.3Ba0.3MnO3 compound

Abstract

Magnetic and magnetocaloric effects of the polycrystalline La0.4Pr0.3Ba0.3MnO3 (LPBMO) compound were extensively studied. The critical parameters were extracted from the magnetic isotherms data near the paramagnetic–ferromagnetic phase transition region. The values of the critical exponents were compared with the standard theoretically predicted universality classes of magnetism. Interestingly, the critical parameters exhibit anomalous nature compared to the standard models. Such a discrepancy was analyzed considering the effect of disorder present in the studied compound. Moreover, the material shows moderate values of the relative cooling power and refrigerant capacity. Additionally, we have also calculated the temperature-averaged entropy change and normalized refrigerant capacity for the studied LPBMO compound.