The effect of Yb substitution in the heavy-fermion superconductor CeCoIn$_{5}$*

The discovery of a new family of heavy-fermion superconductors with the formula CeMIn$_{5}$ (M=Co, Rh, Ir ) provides an interesting playground to understand the relation between unconventional superconductivity and quantum criticality. CeCoIn$_{5}$, with the highest ambient pressure superconducting transition temperature of all heavy-fermion compounds, exhibits a magnetic field-tuned quantum critical point. The peculiar magnetic properties of CeCoIn$_{5}$ are determined by the interaction between the magnetic moments of the Ce$^{3+}$ ions and the spins of conduction electrons. Through systematic studies of Ce$_{1-x}$Yb$_{x}$CoIn$_{5}$ alloys, where the magnetic Ce ions (4$f^{1}$ configuration) are diluted by Yb (hole analogue; 4$f^{13}$ configuration), it allows us to study the nature of intersite interactions. Lattice constant, magnetic susceptibility, and electrical resistivity data of Ce$_{1-x}$Yb$_{x}$CoIn$_{5}$ alloys throughout the range $0\leq x \leq 1$ will be reported.