Observation of quantum oscillations in the electrical resistivity of SrRuO₃

We report the observation of quantum oscillations in the electrical resistivity of a high-quality thin him of the itinerant ferromagnet SrRuO3. Our study demonstrates the existence of long-lived fermion quasiparticles at low temperatures, and strongly suggests that the ground state of SrRuO3 is a Fermi liquid, even though ac and de conductivity measurements at higher temperatures show anomalous metallic behavior. The implications of these results are discussed. [S0163-1829(98)52344-2]