High-pressure study of the non-Fermi liquid material U2Pt2In
P. Estrela, A. de Visser, T. Naka, F. R. de Boer, L. C. J. Pereira
Abstract
The effect of hydrostatic pressure (p<= 1.8 GPa) on the non-Fermi liquid state of U2Pt2In 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 T2-term with pressure. The low-temperature resistivity can be analysed satisfactorily within the magnetotransport theory of Rosch, which provides strong evidence for the location of U2Pt2In at an antiferromagnetic quantum critical point. For I||c the resistivity increases under pressure, indicating the enhancement of an additional scattering mechanism. In addition, we have measured the pressure dependence of the antiferromagnetic ordering temperature (TN= 37.6 K) of the related compound U2Pd2In. A simple Doniach-type diagram for U2Pt2In and U2Pd2In under pressure is presented.
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