摘要:
We report the low-temperature specific heats of NpCu5-xPdx (x = 0, 0.5, 1.0, and 1.5), the "plus one f-electron" analogs to the well-studied non-Fermi liquid (nFl) system UCu5-xPdx. The Np materials were shown to form in the same AuBe5 structure type as the U pseudobinary alloys. A number of differences between the Np and U materials are found. The magnetic transition at 15 K in the U system is evidently suppressed to lower temperatures in the Np analog, and the low-temperature C/T values are strongly enhanced in the NpCU5-xPdx (x = 1.0 and 1.5) alloys vs. their U counterparts. Finally, NpCu4Ni appears to show non-Fermi liquid behavior similar to that of the NpCu5-xPdx system, just as UCu4M is quite similar to UCu4Pd in its nFl behavior. (c) 2006 Elsevier B.V. All rights reserved.