Non-fermi-liquid behaviour around the magnetic quantum critical point in UGa₃

We studied the electronic state of UGa₃ by measuring the electrical resistivity under pressure. When pressure is applied to UGa₃, the Néel temperature T_N = 67 K decreases steeply and becomes zero around 2.6 GPa. Correspondingly, the coefficient A in the electrical resistivity ρ = ρ₀ + AT², which is characteristic for Fermi liquid, increases steeply with increasing pressure. Around a magnetic quantum critical point of 2.6 GPa, a non-Fermi-liquid behaviour is found, showing a linear T-dependence of the resistivity, although the Fermi-liquid behaviour recovers above 4 GPa and the A-value decreases with increasing pressure. Furthermore, a resistivity drop, which might be related to superconductivity, was found below 0.3 K at 1.5 GPa, where the residual resistivity ρ₀ has a maximum.