Non-Fermi-liquid behavior in nearly ferromagnetic SrIrO3 single crystals

We report magnetic, electric transport, and calorimetric properties of single-crystal SrIrO3 as a function of temperature T and applied magnetic field H. We find that SrIrO3 is a non-Fermi-liquid metal near a ferromagnetic instability, as characterized by the following properties: (1) small saturation moment and no evidence for long-range order down to 1.7 K, (2) strongly enhanced magnetic susceptibility that diverges as Tγ at low temperatures with 1 2<γ<1, depending on the applied field, (3) heat capacity C(T,H)∼-T ln T that is readily enhanced in low applied fields, and (4) T32 dependence of electrical resistivity over the range 1.7<T<120 K. The data imply SrIrO3 is a rare example of a stoichiometric oxide compound that exhibits non-Fermi-liquid behavior near a quantum critical point (T=0 and μ0 H=0.23 T).