Non-Fermi-liquid behavior within the ferromagnetic phase in URu2-xRexSi2.

The ${\mathrm{U}\mathrm{R}\mathrm{u}}_{2\ensuremath{-}x}{\mathrm{R}\mathrm{e}}_{x}{\mathrm{S}\mathrm{i}}_{2}$ system exhibits ferromagnetic order for Re concentrations $0.3lx\ensuremath{\le}1.0$. Non-Fermi-liquid (NFL) behavior is observed in the specific heat for $0.15\ensuremath{\le}x\ensuremath{\le}0.6$ [$C/T\ensuremath{\propto}\ensuremath{-}\mathrm{ln}T$ (or ${T}^{\ensuremath{-}0.1}$)], and also in the power-law $T$ dependence of the electrical resistivity [$\ensuremath{\rho}(T)\ensuremath{\propto}{T}^{n}$] with $nl2$ for $0.15\ensuremath{\le}xl0.8$, at low $T$, providing strong evidence that the NFL behavior persists within the ferromagnetic phase. Furthermore, the deviation of the physical properties of ${\mathrm{U}\mathrm{R}\mathrm{u}}_{2\ensuremath{-}x}{\mathrm{R}\mathrm{e}}_{x}{\mathrm{S}\mathrm{i}}_{2}$ from Fermi-liquid behavior is most pronounced at the ferromagnetic quantum critical point, and the NFL behavior found in the ferromagnetic phase may be consistent with the Griffiths-McCoy phase model.