Surface morphology of Sm1+xBa2-xCu3O6+δ films deposited by metal organic chemical vapour deposition

We have prepared the Sm1+xBa2-xCu3O6+δ thin films with various values of x on MgO and SrTiO3 by metal organic chemical vapour deposition using a liquid-state precursor. In this work we investigate the influence of the Sm-Ba substitution on superconducting properties (Tc, Jc) and surface morphology. As the value of x approaching to 0 (stoichiometry), Tc and Jc showed the maximum values on MgO, about 91 K and 1.4 MA/cm2, respectively. By the atomic force microscopy analysis, it was found that the grain size was large and the surface was flat for x>0. On the other hand, for x<0 the surface was rough due to many outgrowths of irregular shapes