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Non-Fermi-liquid behavior at the antiferromagnetic quantum critical point in the heavy-fermion system <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Ce</mml:mi><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi>Cu</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Co</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Ge</mml:mi><mml:mn>2</…
Polycrystalline samples of $\mathrm{Ce}{({\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x})}_{2}{\mathrm{Ge}}_{2}$ were investigated by means of electrical resistivity $\ensuremath{\rho}(T)$, magnetic susceptibility $\ensuremath{\chi}(T)$, specific heat ${C}_{p}(T)$, and thermoelectric power $S(T)$ measurements. The long-range antiferromagnetic order, which set in at ${T}_{N}=4.1\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ in ${\mathrm{CeCu}}_{2}{\mathrm{Ge}}_{2}$, is suppressed by non-isoelectronic cobalt doping at a critical value of the concentration ${x}_{c}=0.6$, accompanied by …