Heavy-fermion behavior in a pseudobinary system:U(In1−xSnx)3

The temperature dependence of the magnetic susceptibility, the low-temperature specific heat, and the field dependence of the high-field magnetization were measured for the pseudobinary system $\mathrm{U}{\left({\mathrm{In}}_{1-x}{\mathrm{Sn}}_x\right)}_3$ for $0\le x\le 1$. The results show a clear evolution from long-range antiferromagnetism for $x<\mathrm{}0.45\mathrm{}$ (In rich) to a heavy-fermion region for $0.45\le x\le 0.80$ and to highly enhanced paramagnetism for $x>\mathrm{}0.8\mathrm{}$ (Sn rich). These results represent the first systematic study of the onset of the salient features associated with heavy-fermion behavior in a pseudobinary system.