GRIFFITHS PHASE AND PREDICTION OF MAGNETOCALORIC EFFECT IN La0.78Ca0.22MnO3 NANOPARICLES

Abstract

Griffith phase and the magnetocaloric effect in La_0.78Ca_0.22MnO₃ nanoparticles have been studied in detail. The magnetic entropy change and the magnetization-related change of the specific heat were calculated using the phenomenological model from the temperature dependence of magnetization M(T) data of the sample. The maximum magnetic entropy change () was found to be 0,95 J/kg.K for H = 12 kOe, making this material a suitable candidate for magnetic refrigeration applications. A master curve of the magnetic entropy change confirmed the second order of the magnetic phase transition. The appearance of Griffith phase enhances the magnetocaloric effect in the sample.