Epitaxial growth and electrical transport properties of La0.5Sr0.5CoO3 thin films prepared by pulsed laser deposition

Epitaxial growth of the La0.5Sr0.5CoO3(LSCO) thin films has been realized o n LaAlO3, SrTiO3 and MgO substrates by pulsed laser deposition. The epitaxi al growth behavior and the electrical transport properties of these films w ere studied systematically. The temperature dependencies of the resistivity of the film have been determined. Studies indicate that close dependencies exist between the crystal structures and the electrical transport properti es of the epitaxial LSCO films, and that the epitaxial thin films are of lo w resistivity and metallic conductive features. The epitaxial films deposit ed on the LaAlO3 substrates at about 700 degrees C possess the optimal prop erties compared with the others. Discussions of the dependencies and the me chanisms of the epitaxial structures on the electrical transport properties of the LSCO films have been made.