Abstract
USn3 is a highly enhanced paramagnet and close to a magnetic instability. Whereas UPb3 has an antiferromagnetic transition at 31 K and the 5f electrons appear to be more localized. Both USn3 and UPb3 crystallize in the Cu3Au structure and complete pseudobinary alloys can be prepared. The temperature dependence of the specific heat C(T) for 1.5≤T≤50 K and magnetic susceptibility χ(T) for 1.8≤T≤ 400 K has been measured on U(Sn1−xPbx)3 for 0≤x≤1.0. Both χ(T) and C(T) data indicate that the substitution of Sn for Pb in UPb3 (i.e., decreasing x) causes the Neel temperature TN to increase initially to 38 K for x≊0.7 then decrease with TN→0 for x=0.07. The electronlike contribution to C(T) as T→0 remains high in the magnetically ordered state with the electronic specific heat coefficient γ for UPb3 ≊173 mJ/mol K2. The magnetic entropy removal below TN for UPb3 is ∼2−3 J/mol K, i.e., is smaller than expected for a U3+ or U4+ free ions and even for U3+ with a doublet ground state.
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