Thermodynamic Properties of Pr3RuO7

We have measured the thermal and magnetic properties of single crystals of Pr$_{3}$RuO$_{7}$. The magnetic measurements indicate an antiferromagnetic transition with spins aligned along the RuO chains (i.e. c-axis) at T$_{N}$ = 54 K at which there is a large step anomaly in the specific heat, $\Delta $c $\sim $ R, but the estimated entropy change is small, $\Delta $s $\sim $ R/10, suggesting only incomplete spin ordering in zero field. On the other hand, there is a metamagnetic transition at low temperature at B$_{c} \quad \sim $ 3T with a large saturated moment of $\sim $ 5 $\mu _{B}$. Surprisingly, there is a large linear contribution to the specific heat at low temperatures, $\gamma \quad \sim $ 0.16 J/mol{\textbullet}K$^{2}$ and large temperature independent contribution to the susceptibility, with a Wilson ratio $\chi _{0}$/$\gamma \quad >$ 1, suggesting that, despite its insulating behavior, there is a finite density of states of strongly correlated electrons at the Fermi surface.