Suppression of Antiferromagnetism by Kondo Effect and Quantum Critical Behavior in CeCoGe_{<b>3</b>-<i><i>x</i></i>}Si_{<i><i>x</i></i>}(<b>0</b>≤<i><i>x</i>≤<b>3</b></i>)

Abstract

Several pseudoternary compounds of the CeCoGe 3- x Si x system were studied by magnetic-susceptibility, electrical-resistivity and specific-heat measurements. Substitution of silicon for germanium generates the normal chemical pressure and enhances the exchange interaction. The antiferromagnetism in CeCoGe 3 is ultimately suppressed around x =1.2 by the enhanced Kondo effect. Non-Fermi liquid-like behavior has been observed around the critical concentration and an intermediate-valence regime with a very high Kondo temperature of the order of 900 K is followed farther on in the silicon rich region.