  Motivated by the possibility of observing the co-existence between magnetism
and unconventional superconductivity in heavy-fermion Ce$_{1-x}$Sm$_x$CoIn$_5$
alloys, we studied how the samarium substitution on the cerium site affects the
magnetic field-tuned-quantum criticality of stoicheometric CeCoIn$_5$ by
performing specific heat and resistivity measurements. By applying an external
magnetic field, we have observed Fermi-liquid to non-Fermi-liquid crossovers in
the temperature dependence of the electronic specific heat normalized by
temperature and of the resistivity. We obtained the magnetic-field-induced
quantum critical point (QCP) by extrapolating to zero temperature the
temperature - magnetic field dependence at which the crossovers take place.
Furthermore, a scaling analysis of the electronic specific heat is used to
confirm the existence of the QCP. We have found that the magnitude of the
magnetic-field-induced QCP decreases with increasing samarium concentration.
Our analysis of heat capacity and resistivity data reveals a zero-field QCP for
$x_\textrm{cr} \approx 0.15$, which falls inside the region where Sm ions
antiferromagnetism and superconductivity co-exist.
