High pressure transport study of non-Fermi liquid behaviour in U2Pt2In and U3Ni3Sn4
A. de Visser, P. Estrela, T. Naka
Abstract
The strongly correlated metals U2Pt2In and U3Ni3Sn4 show pronounced non-Fermi liquid (NFL) phenomena at ambient pressure. Here we review single-crystal electrical resistivity measurements under pressure (p <= 1.8 GPa) conducted to investigate the stability of the NFL phase. For tetragonal U2Pt2In (I||a) we observe a rapid recovery of the Fermi-liquid T2-term with pressure. The Fermi-liquid temperature varies as TFL ~ p-pc, where pc= 0 is a critical pressure. The analysis within the magnetotransport theory of Rosch provides evidence for the location of U2Pt2In at a zero pressure antiferromagnetic quantum critical point (QCP). In the case of cubic U3Ni3Sn4 we find TFL ~ (p-pc)1/2. The analysis provides evidence for an antiferromagnetic QCP in U3Ni3Sn4 at a negative pressure pc= -0.04+-0.04 GPa.
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