Enhancement of Curie Temperature and Magnetoresistance in the
Perovskit es La2/3Cal/3Mnl-xSixO3
Chin. Phys. Lett. 2000, 17 (11):
Structural, magnetic, and transport properties of perovskite La2/3Cal/3Mnl-xSixO3(x = 0, 0.025, 0.05) have been studied. The incorporation of Si decreases the overall resistivity, but obviously increases the Curie temperature (TC), metal-insulator transition temperature (TP), and the magnetoresistance ratio MR (defined as [R(0) - R(H)]/R(0)) near room temperature. Comparing with La2/3Cal/3MnO3 the TC , TP, and MR of the sample with x = 0.05 increase by 30, 45K, and 20%, respectively. Lattice effects may play a more important role than the magnetic dilution in the case of low Si substitution.