Ferromagnetic quantum phase transition in Sr1-xCaxRuO3 thin films

The Sr1-xCaxRuO3 series recently received a lot of attention because of a continuous evolution from itinerant electron magnetism towards a paramagnetic metallic state. We focus on the region near the quantum phase transition at x=0.7. Using metal-organic aerosol deposition, we have grown high-quality epitaxial thin films. For pure CaRuO3 (x=1), grown on NdGaO3, the residual resistivity ratio (RRR) approaches 55, i.e. the highest value reported up to now. Pronounced non-Fermi liquid effects are observed in the temperature dependence of the electrical resistivity, which could be suppressed by the application of large magnetic fields.