Thin Solid Films, Vol.519, No.5, 1540-1545, 2010
Low-temperature fabrication of superconducting FeSe thin films by pulsed laser deposition
Superconducting FeSe thin films were prepared at a substrate temperature of 320 degrees C by pulsed laser deposition. X-ray diffraction and transmission electron microscopic analyses showed that highly c-axis-orientated and high-quality films were obtained on various substrate materials, including single-crystal MgO, LaAlO3, SrTiO3 and (100)-Si, and amorphous-SiOx, at such low temperature. From transport measurements all the films showed low-temperature structural phase transition at similar to 60-90 K and superconducting transition at onset temperature varies from similar to 7K to <2 K, depending on the substrate used. The transport property of FeSe film on Si was found most different from all the others, in spite of their similarity in structural analysis. Chemical analysis demonstrated that Fe and Se homogeneously distributed in the film and the stoichiometry of FeSe and the bonding states of Fe and Se are as well uniform along the film growth direction. (C) 2010 Elsevier B.V. All rights reserved.