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The electronic and magnetic properties in ABO3 perovskite oxides areextremely sensitive to lattice structure but also the dimensionality, such asthe thickness in thin film form. Here, we report the thickness-dependentelectro-magnetic properties of ultrathin epitaxially stabilized Sr1-xBaxRuO3 (x= 0.08, 0.2) thin films on SrTiO3 (001) substrate. The results reveal that theBa-doping (0.08 < x < 0.20) reduces RuO6 orthorhombic distortions existing inSrRuO3 and induces a tetragonal distortion as evidenced by out-of-plane latticeexpansion. A metal-to-insulator transition, accompanied by a ferromagnetic tonon-magnetic transition occurs with reducing film thickness from 10 to 3unit-cell (u.c.) for both x = 0.08 and 0.2, regardless of the doping level. Theresults suggest that the effects of compositional vacancies andsurface/interface contributions introduced via dimensional confinement are moredominant than A-site chemical disorder or structural distortion for the loss ofmetallicity and ferromagnetism in ultra-thin epitaxial films.

Thickness Dependent Itinerant Ferromagnetism in Ultrathin Ba-Doped SrRuO3 films