Enhanced paramagnetism of the 4 d itinerant electrons in the rhodium oxide perovskite SrRhO 3

Polycrystalline rhodium (IV) oxide perovskite ${\mathrm{SrRhO}}_{3}$ was obtained by high-pressure synthesis techniques, followed by measurements of the magnetic susceptibility, electrical resistivity, and specific heat. The title compound has five $4d$ electrons per perovskite unit and shows Fermi-liquid behavior in its electrical resistivity. The magnetic susceptibility is large $[\ensuremath{\chi}(300 \mathrm{K})\ensuremath{\sim}1.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3} \mathrm{e}\mathrm{m}\mathrm{u}/\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{}\mathrm{Rh}]$ and proportional to ${1/T}^{2}$ $(l380 \mathrm{K}),$ while there is no magnetic long-range order above 1.8 K. The specific heat measurements indicate a probable magnetic contribution below $\ensuremath{\sim}15 \mathrm{K},$ which is not predicted by the self-consistent renormalization theory of spin fluctuations for both antiferro- and ferromagnetic three-dimensional nearly ordered metals.