Magnetic and electrical properties of (Pu,Lu)Pd3

Abstract

We present measurements of the magnetic susceptibility, heat capacity and electrical resistivity of Pu${}_{1-x}$Lu${}_x$Pd${}_3$, with $x$=0, 0.1, 0.2, 0.5, 0.8 and 1. PuPd${}_3$ is an antiferromagnetic heavy fermion compound with $T_N=24$~K. With increasing Lu doping, both the Kondo and RKKY interaction strengths fall, as judged by the Sommerfeld coefficient $\gamma$ and Néel temperature $T_N$. Fits to a crystal field model of the resistivity also support these conclusions. The paramagnetic effective moment ${\mu }_{\mathrm{eff}}$ increases with Lu dilution, indicating a decrease in the Kondo screening. In the highly dilute limit, ${\mu }_{\mathrm{eff}}$ approaches the value predicted by intermediate coupling calculations. In conjunction with an observed Schottky peak at $\sim$60~K in the magnetic heat capacity, corresponding to a crystal field splitting of $\sim$12~meV, a mean-field intermediate coupling model with nearest neighbour interactions has been developed.

13 pages, 13 figures

References in corpus (1)

• Magnetic and electrical properties of dhcp NpPd3 and U(1-x)Np(x)Pd3