Thin films of Ln<SUB>1&#8722;x</SUB>Sr<SUB>x</SUB>CoO<SUB>3</SUB> (Ln=La, Nd and Gd) and SrRuO<SUB>3</SUB> by nebulized spray pyrolysis

Thin films of Ln<SUB>1&#8722;x</SUB>Sr<SUB>x</SUB>CoO<SUB>3</SUB>, Nd<SUB>0.5</SUB>Sr<SUB>0.5</SUB>CoO<SUB>3</SUB>, Gd<SUB>0.5</SUB>Sr<SUB>0.5</SUB>CoO<SUB>3</SUB> and SrRuO<SUB>3</SUB> have been deposited on Si(100), LaAlO<SUB>3</SUB>(100) and SrTiO<SUB>3</SUB>(100) single crystal substrates by nebulized spray pyrolysis. The films deposited on Si are generally polycrystalline, but they are highly oriented on the oxide substrates. The cobaltate films are generally not metallic, but exhibit low resistivity specially when x=0.3 and 0.5, the latter also exhibiting ferromagnetic characteristics. Films of La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>CoO<SUB>3</SUB> show negative magnetoresistance of 35% around 180 K. Films of SrRuO<SUB>3</SUB> are metallic on Si and LaAlO<SUB>3</SUB> substrates but show an insulator-metal transition on SrTiO<SUB>3</SUB> around 130 K, around which temperature negative magnetoresistance is observed