High-pressure study of the non-Fermi liquid material U_2Pt_2In

摘要

The effect of hydrostatic pressure (p ≤ 1.8 GPa) on the non-Fermi liquid state of U_2Pt_2In is investigated by electrical resistivity measurements in the temperature interval 0.3-300 K. The experiments were carried out on single-crystals with the current along (I‖c) and perpendicular (I‖a) to the tetragonal axis. The pressure effect is strongly current-direction dependent. For I‖a we observe a rapid recovery of the Fermi-liquid T~2-term with pressure. A comparison of the data with the magnetotransport theory of Rosch provides evidence for the location of U_2Pt_2In at an antiferromagnetic quantum critical point. For I‖c the resistivity increases under pressure, indicating the enhancement of an additional scattering mechanism.