INFLUENCES OF SUBSTRATES AND SUBSTRATE TEMPERATURES ON CHARACTERISTICS OF EPITAXIAL LA0.5SR0.5COO3 THIN-FILMS

Epitaxial growth of La0.5Sr0.5CoO3 (LSCO) film has been achieved by pu lsed laser deposition. Widely used substrates, MgO, SrTiO3 and LaAlO3, were chosen to examine the effect of the substrates on the growth of LSCO films. The influence of the substrate temperatures (T-s) on the c haracteristics of the LSCO films was studied in a temperature range of 500-850 degrees C. The LSCO films deposited at substrate temperatures of T-s = 800-850 degrees C show good epitaxial features, better than that of the films deposited at lower T-s. The experimental results rev eal that the lattice mismatch and the difference of the expansion coef ficients between the substrates and the LSCO films are important in th e growth process of the LSCO films. (C) 1998 Published by Elsevier Sci ence S.A. All rights reserved.