Magnetotransport properties and magnetocaloric effect of (La0.7Ba0.3MnO3)1-x/(Al2O3)x composites have been
investigated through their theoretical and experimental studies. The Al2O3 addition increases the resistivity,
showing up a crossover from 3D Mott to the soft gap variable range hopping (VRH). The relative cooling power
of LBMO matrix (~98.77 Jkg−1, H = 2 T) is approximately 65 percentage of that of pure Gd (RCP = 153 Jkg−1,
H = 2 T). It means to achieve an active magnetic refrigerator employing LBMO will need more than one and half
times the volumes of a refrigerant unit consisting of pure Gd. A good concordance is observed as simulated both
resistivity and magnetization curves