Magnetic characteristics, magnetocaloric effect, and critical behavior of Nd1-xSrxMnO3 compounds by Sr doping (x = 0.2, 0.3, 0.4, 0.5) were studied. All samples maintained orthorhombic structures, but the space group changed from Pnma (No. 62) for x = 0.2, 0.3 to Imma (No. 74) for x = 0.4, 0.5. As Sr doping increased, the Curie temperature (T-C), Curie-Weiss temperature (T-CW), and magnetization increased, attributed to the double exchange (DE) interaction. A discrepancy between T-CW and T-C was observed due to the competition between polarons and DE interaction. The critical behavior was inve...
