“…However, the presence of the grain boundaries in these polycrystalline CMR materials introduces more resistance for the electron transport, which hinders the enhancement of MR indirectly. Recently, it is found [9,10] that by adding Ag in polycrystalline CMR materials, can lead to large room temperature MR if T C of the compounds is near room temperature, as well as to reduction in the resistivity in terms of the modifications of microstructure, electrical and magnetic inhomogeneity on the grain surfaces/boundaries. Based on these achievements, we combined Ag 2 O with polycrystalline La 0.67 Ba 0.33 Mn 0.88 Cr 0.12 O 3 (LBMCO) synthesized by sol-gel method.…”