Effect of reduced local lattice disorder on the magnetic properties of B-site substituted La0.8Sr0.2MnO3

Disorder induced by chemical inhomogeneity and Jahn-Teller (JT) distortions is often observed in mixed valence perovskite manganites. The main reasons for the evolution of this disorder are connected with cationic size differences ratio between JT active non-JT ions. quenched leads to a spin-cluster state above magnetic transition temperature. effect Cu, B-site substitution La0.8Sr0.2MnO3 compound, on disordered phase has been addressed here. X-ray powder diffraction reveals rhombohedral (R-3c) structures both parent substituted compound negligible change lattice volume. compositions two compounds were verified ion beam analysis technique. With electronic bandwidth, temperature tuned towards room (318 K), an important requirement refrigeration. However, small decrease isothermal entropy was Cu-substitution, related saturation magnetization.