Thermodynamic and transport investigation of CeCoIn5-xSnx

Measurements of specific heat, magnetic susceptibility, electrical resistivity, and penetration depth have been performed on CeCoIn5-xSnx (0 <= x <= 0.24) single crystals. The suppression of superconductivity and the decrease of the specific heat jump at T-c, Delta C/T-c, with increasing Sn concentration, and the power-law temperature dependence of penetration depth are consistent with impurity scattering calculated within the Abrikosov-Gorkov formalism indicating d-wave superconductivity in CeCoIn5-xSnx. The non-Fermi liquid behavior [C/T similar to-ln T and rho(T)similar to T] observed in the normal state in zero magnetic field is quite robust against Sn substitution (and a variety of other tuning parameters), suggesting quantum criticality involving itinerant f-electrons in this system.