Abstract
The magnetic susceptibilities and electrical resistivities of dilute Th(Np) alloys containing 0.1, 0.5, and 1.0 at.% Np have been measured from below 2°, 59°, 300°K. At the lowest temperatures of the measurements, the resistivities decrease monotonically with temperature, and are proportional to T2. The susceptibilities follow a Curie-Weiss law of the form χ=χ0+C/(T−θ), where θ=−11° and −19° for 0.5% and 1.0% Np, respectively. The Curie-Weiss constant C yields effective moments of 0.8 and 1.1 μβ per Np atom for 0.5% and 1.0% Np. These values are considerably lower than would be expected from the free ionic configuration of 5f46d17s2, and are probably due to hybridization of the 5f electrons, as is the case in pure Np and Pu. The data indicate the formation of a broad 5f virtual bound state at the Fermi level, which then causes paramagnon-conduction electron scattering, as has recently been found for Th(U).1
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