  Spin-orbit torques (SOT) in thin film heterostructures originate from strong
spin-orbit interactions (SOI) that, in the bulk, generate a spin current as the
result of extrinsic spin-dependent, skew or/and side-jump, scattering, or in
the intrinsic case due to Berry curvature in the conduction band. While most
SOT studies have focused on materials with heavy metal components, the oxide
perovskite SrRuO3 has been predicted to have a pronounced Berry curvature.
Through quantification of its spin current by the SOT exerted on an adjacent Co
ferromagnetic layer, we determine that SrRuO3 has a strongly temperature (T)
dependent spin Hall conductivity which becomes particularly high at low T, e.g.
\sigma_{SH} \geqslant (\hbar/2e)3x10^{5} \Omega^{-1}m^{-1} at 60 K. Below the
SrRuO3 ferromagnetic transition, non-standard SOT components develop associated
with the magnetic characteristics of the oxide, but these do not dominate as
with spin currents from a conventional ferromagnet. Our results establish a new
approach for the study of SOI in epitaxial conducting oxide heterostructures
and confirm SrRuO3 as a promising candidate material for achieving new and
enhanced spintronics functionalities.
