Institution: | a Departamento de Física, Facultad de Ingeniería, UBA, Paseo Colón 850, 1063, Buenos Aires, Argentina b Unidad de Actividad Física, CNEA, Av. Libertador 8250, 1429, Buenos Aires, Argentina c Instituto de Física “Gleb Wataghin”, UNICAMP, 13083-970, Campinas-SP, Brazil |
Abstract: | Thin films of perovskite manganite, with nominal composition La0.5Ca0.5MnO3, have been prepared by pulsed laser deposition on (1 0 0) SrTiO3, (1 0 0) LaAlO3, (1 0 0) Si and YSZ/CeO2-buffered (1 0 0) Si substrates. Structural and electrical characterisation was performed on the films. The magneto-transport properties of all the thin films depart from the bulk behaviour. The LCMO film grown on buffered Si shows an insulator–metallic transition around 130–150 K while the one deposited directly on Si displayed a similar behaviour under a melting field of 1 T. However, that transition is absent in the films grown on LAO and STO. We suggest that appropriate stress values induced by the substrate favour the formation of metallic percolative paths. |