Ce ${({Cu}_{0.9} {Ag}_{0.1})}_{6}$ : Highest electronic specific-heat coefficient of the heavy-fermion systems

We have measured the static magnetic susceptibility

χ

of the compound

Ce {({Cu}_{1 - x} {Ag}_{x})}_{6}

for

x \leq 0.1

from 2.4 to 300 K and the specific heat of one sample (

x = 0.1

) from 0.6 to 30 K. The effect of Ag substitution is to markedly increase both

χ

and the Sommerfeld constant

γ

at low temperatures.

γ

for the

x = 0.1

sample is temperature dependent and reaches the value 2.1 J/mole

K^{2}

at 0.6 K, extrapolating to approximately 2.8 J/mole

K^{2}

T = 0

K. These results can be analyzed in terms of a twofold decrease in the value of the Kondo temperature

T_{K}

with 10% Ag substitution.

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Ce(Cu0.9Ag0.1)6: Highest electronic specific-heat coefficient of the heavy-fermion systems