ИСТИНА

An experimental study of ternary Ce3Pd4Si4 evidenced non-Fermi liquid properties due to the proximity of this non-magnetic compound to a quantum critical point. The ground state observed for this Ce system appears to be a result of mutual interactions of the crystalline electric field, of the Kondo effect and of RKKY interactions. A subtle change of the balance of these interactions e.g., by pressure or by substitutions is expected to trigger some instability, presumably of magnetic origin. The aim of the present investigation is to reveal the response of the system when certain atoms in Ce3Pd4Si4 are exchanged by different other appropriate elements. Here we will show how long range magnetic order in the substituted materials develops on a substitution of Ce/La, of Pd/Ni and of Si/Ge from a study of temperature, pressure and magnetic field dependent transport proper ties, of magnetization and of specific heat.