High pressure investigation of the heavy-fermion antiferromagnet U_3Ni_5Al_19

Details High pressure investigation of the heavy-fermion antiferromagnet U_3Ni_5Al_19 High pressure investigation of the heavy-fermion antiferromagnet U_3Ni_5Al_19

2004-09-08

arxiv.org/abs/cond-mat/0409202v1

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 5 figures

Scientific paper

10.1103/PhysRevB.71.014419

Measurements of magnetic susceptibility, specific heat, and electrical resistivity at applied pressures up to 55 kbar have been carried out on single crystals of the heavy-fermion antiferromagnet U_3Ni_5Al_19, which crystallizes in the Gd_3Ni_5Al_19 orthorhombic structure with two inequivalent U sites. At ambient pressure, a logarithmic T-dependence of the specific heat and T-linear electrical resistivity below 5 K indicates non-Fermi liquid (NFL) behavior in the presence of bulk antiferromagnetic order at T_N=23 K. Electrical resistivity measurements reveal a crossover from non-Fermi liquid to Fermi liquid behavior at intermediate pressures between 46 kbar and 51 kbar, followed by a return to NFL T^{3/2} behavior at higher pressures. These results provide evidence for an ambient pressure quantum critical point and an additional antiferromagnetic instability at P_c=60 kbar.

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