Impurity Studies in CeCoIn$_{5}$

Systematic alloy studies of CeTlIn$_{5}$ (T = Co, Rh, Ir,) reveal the stability of superconductivity in a wide range of composition; and in some cases it coexists with a magnetically ordered phase. We extended these studies to include (R, Ce)(Co, M)In$_{5}$ are ( R= Pr and M= Fe, Mn). Our preliminary measurements indicate that the samples are single phase, and they exhibiting a wide range of transport and magnetic properties. In this communication we present the results of our resistivity and magnetic susceptibility measurements.