Susceptibility and specific heat of CeRu2Si2 doped with U

The susceptibility, χ, and the specific-heat, C_p, have been measured on the pseudo-ternary compounds Ce_1-xU_xRu₂Si₂ (0⩽x⩽0.1). The measurements were taken on single crystals. We have found an increase of antiferromagnetic correlations, as it is evident from susceptibility measurements, and a decrease of the electronic specific-heat coefficient γ_T→0 with the U alloying of CeRu₂Si₂. We did not find any evidence of a long-range magnetic ordering. The estimated changes of susceptibility and heat-capacity were discussed in the frame of volume changes due to the alloying of CeRu₂Si₂