Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-09-21
Eur. Phys. J. B 23 (2001) 449-454
Physics
Condensed Matter
Strongly Correlated Electrons
21 pages (including 5 figures); pdf format
Scientific paper
10.1007/s100510170036
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. The low-temperature resistivity can be analysed satisfactorily within the magnetotransport theory of Rosch, which provides strong 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. In addition, we have measured the pressure dependence of the antiferromagnetic ordering temperature (T_N= 37.6 K) of the related compound U_2Pd_2In. A simple Doniach-type diagram for U_2Pt_2In and U_2Pd_2In under pressure is presented.
de Boer F. R.
Estrela P.
Naka Takashi
Pereira L. C. J.
Visser Anne de
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