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We have performedresistivity measurements as a functionof temperature, with and withoutan external magnetic field. Magnetization measurements are also done as a function oftemperature M(T) aswell as a function of an external magnetic field M(H) for La0.73Ca0.27Mn1-xCuxO3compounds with 0The samples with x = 0 and 0.06 are insulators. As forthe samples with x =0.10, 0.13, and0.19, they undergo an insulator to metaltransition as the temperature is lowered. The insulator-metal transition temperaturesare 24 K, 74 K, and 69 K for x =0.10, 0.13, and0.19, respectively. The magnetoresistance decreases with increasing values of Cu, i.e. 75%, 72%, 64%, and 35% for x = 0, 0.06, 0.10, and 0.13respectively. Samples in accordancewith the model of crystalline metal Ln Rvs. 1/T are compared to Mott insulator models Ln R vs. 1/T0.25. Based on the magnetization curve, aparamagnetic to ferromagnetic transition is observed at Curie temperature, TC,of ~ 196 K, 170 K, 140 K, 137 K, and 113 K for x = 0, 0.06, 0.10, 0.13, and 0.19 respectively. |
