Magnetic instability around the quantum critical point in CeCoGe3-xSix (0≤x≤3)

We have studied Kondo effect and quantum critical behavior in the pseudoternary system of CeCoGe3-xSix by measuring the electrical resistivity, magnetic susceptibility, and specific heat at low temperatures down to 0.05 K. Substitution of silicon for germanium generates normal chemical pressure and enhances the exchange interaction. Antiferromagnetism disappears around x similar to 1.2 and non-Fermi liquid-like behavior is seen, T-3/2 or T dependence in p(T), depending on the temperature range and - In T in C/T. The resistivity was also measured in magnetic fields of up to 6 T and found to recover Fermi liquid behavior in magnetic fields.