  We report a detailed study of the electric transport and magnetic properties
of the LaNdCaMnO manganite system. Substitution of LaIII by smaller NdIII ions,
reduces the mean ionic radius of the A site ion. We have studied samples in the
entire range between rich La and rich Nd compounds. Results of DC magnetization
and resistivity show that doping destabilize the FM character of the pure La
compound and triggers the formation of a phase separated state at intermediate
doping. We have also found evidence of a dynamical behaviour within the phase
separated state. A phase diagram is constructed, summarizing the effect of
chemical substitution on the system.
