Spin fluctuations in actinide intermetallic compounds

Abstract

Electrical-resistivity and magnetic-susceptibility data for sixteen actinide systems are considered in terms of localized spin fluctuations (lsf). Each of the systems had been proposed earlier as an lsf system on the basis of a $T^2$ resistivity dependence at low temperatures. The data are examined at higher termperatures, and it is shown that the various temperature dependences predicted by Rivier and Zlatic for lsf dilute alloys are found in these ordered-lattice systems. Various spin-fluctuation temperatures ($T_{\mathrm{SF}}$) are determined for each compound. By use of the Friedel-Anderson virtual-bound-state model, values of $T_{\mathrm{SF}}$ are calculated, and are shown to scale simply with $T_{\mathrm{SF}}\text{'}\mathrm{s}$ estimated from the susceptibility data. The results are used to explain the lack of temperature-dependent susceptibilities for the pure lsf metals $\alpha -\mathrm{Np}$ and $\alpha -\mathrm{Pu}$.