Synthesizes and electrical transport properties of (La0.7-xNdx) Ca0.3MnO3 with substitutions of (x=0.00, 0.05, 0.10, 0.15 AND 0.20) / Tuan Zulkifli Tuan Mohd.

CMR material with nominal composition (La0.7-xNdx) Ca0.3MnO3 (x=0.00-0.20) were synthesize and it's electrical and structure properties were investigated by the conventional solid state reaction method. All the data is collected by using four point probe and XRD. The result showed metal - insulator temperature TMI is shifted to lower temperature and the resistivity is increased by increasing the portion of Neodymium (Nd) substitution but interesting characteristic are displayed by x=0.15 and 0.20 the resistivity of both sample is drop drastically and the phenomenon is expected due to the properties of Nd . On the metallic region all samples are fitted well with combination of electron-electron and electron- magnon. The deceasing in the resistivity is suggested due to weaken of double exchange mechanism (DE). Existence of Nd into the perovskite had influence the bonding angle of Mn-O-Mn. ℮g electron on the Mn3+ can not move to Mn4+ easily. From the data obtained and the previous study the structure of all samples is in orthorhombic, where a ≠ b ≠ c.