Magnetic-suseptibility measurements of a praseodymium Kondo system:La1−xPrxSn3

The magnetic susceptibility of ${\mathrm{La}}_{1-x}{\mathrm{Pr}}_x{\mathrm{Sn}}_3$ compounds ($x=1.0,0.7,0.4,0.2,0.1,0.05,0.01,0.0$) has been measured between 2 and 300 K and the heat capacity of ${\mathrm{PrSn}}_3$ and ${\mathrm{LaSn}}_3$ between 20 and 300 K. It is shown that the magnetic susceptibility is anomalously reduced by the interaction with the conduction band showing the delocalization of the $4f$ shell of praseodymium.