Uniaxial magnetocrystalline anisotropy in CaRu O3

CaRu O3 is a paramagnetic metal and since its low temperature resistivity is described by ρ= ρ0 +A Tγ with γ∼1.5, it is also considered a non-Fermi liquid (NFL) metal. We have performed extensive magnetoresistance and Hall effect measurements of untwinned epitaxial films of CaRu O3. These measurements reveal that CaRu O3 exhibits uniaxial magnetocrystalline anisotropy. In addition, the low-temperature NFL behavior is most effectively suppressed when a magnetic field is applied along the easy axis, suggesting that critical spin fluctuations, possibly due to proximity of a quantum critical phase transition, are related to the NFL behavior.