Electron transport studies of UCu5Al and U1−Th Cu5Al

Tran, V.H.; Griveau, Jean‐Christophe; Troć, R.; Rébizant, J.; Wastin, F.

doi:10.1016/j.jmmm.2003.11.162

Cited by 3 publications

(1 citation statement)

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“…At ambient pressure the resistance value decreases slightly with temperature down to 52 K, where an upturn is observed, suggesting the opening of a magnetic gap as for UCu 5 Al. 23 Then, we observe a clear increase in the resistivity when cooling down below T N . A change in slope around 45 K is identified as corresponding to the Néel temperature.…”

Section: Resistivity Under Pressurementioning

confidence: 80%

Magnetic structure and effects of pressure onU4PdGa12

et al. 2009

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We report on the magnetic structure, thermopower, compressibility, and electrical resistivity under pressure of the recently discovered heavy-fermion antiferromagnet U 4 PdGa 12 . The ordering temperature of the annealed polycrystalline U 4 PdGa 12 is T N ϳ 45.5 K. The magnetic structure has been investigated by neutron diffraction. Extra reflections in the powder spectrum appear below ϳ46 K, in good agreement with macroscopic measurements. The simplest magnetic structure compatible with neutron-diffraction data is a collinear antiferromagnetic structure described by the propagation vector q = ͓001͔. In this case the ordered uranium moment amounts to 1.01͑6͒ B and point along the a axis. Thermopower confirms the heavy-fermion features in this uranium intermetallic with positive and high values of Seebeck coefficient. The magnetic transition is clearly identified and induces an upturn below 45.5 K which is followed by a continuous decrease in S͑T͒ at lower temperature. Electrical resistivity measurements of U 4 PdGa 12 under pressure of up to 13.5 GPa indicate the disappearance of the magnetic ordering temperature T N around P c = 10 GPa while compressibility measurements performed by x-ray diffraction up to 25 GPa do not show any structural phase transition related to this magnetic collapse. At higher pressure ͑p Ͼ 10 GPa͒ and at low temperature, a non-Fermi-liquid behavior is observed, with a T 5/3 dependence of the resistivity. This suggests the possible occurrence of a quantum critical point near P c .

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Section: Resistivity Under Pressurementioning

confidence: 80%