Abstract
A gradual change from the Kondo lattice to the impurity Kondo regime has been observed in Ce 1- x La x FeGe 3 ( x =0, 0.1, 0.3, 0.5, 1.0). CeFeGe 3 exhibits a greatly reduced resistivity below about 100 K corresponding to the coherent state of the Kondo lattice. Ce 0.5 La 0.5 FeGe 3 , on the other hand, shows a resistance minimum around 30 K which is consistent with the impurity Kondo regime. The ground state of CeFeGe 3 turns out to be very stable against the La substitution and no magnetic instability is induced in the present diluted system. Magnetic susceptibility at 0 K per mole of Ce, χ(0), and the linear term of the specific heat, γ increase by 24% and 15% from x =0.0 to 0.5, respectively. The Kondo temperatures T K 's estimated from χ(0) and γ decrease accordingly by 20 and 13% in the same range of La content. This decrease in T K is explained by the lattice expansion caused by the substitution of La for Ce.
Published Version
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