Magnetic property change in Kondo impurity-to-Kondo lattice transition in Cesub(x)Lasub(1-x)Cusub(2)Sisub(2) series

Magnetic properties of isostructural substitution solid solutions of Cesub(x)Lasub(1-x)Cusub(2)Sisub(2) (0 < x <= 1) were investigated in 0.06 <= T <= 2.5 K range. The break, related to Cesub(x)Lasub(1-x)Cusub(2)Sisub(2) transition to spin glass, was revealed on the temperature dependence of the magnetic susceptibility at T=Tsub(SG). It was found that Tsub(SG) initially (0.2 <= x <= 0.6) grows from Tsub(SG)=0.3 K up to Tsub(SG)=1.6 K, and then Tsub(SG) value decreases in x > or approximately 0.8 range and Cesub(x)Lasub(1-x)Cusub(2)Sisub(2) compounds become superconducting near x approximately 1. Such change of magnetic properties of Cesub(x)Lasub(1-x)Cusub(2)Sisub(2) relates with transition from the kondo-impurity (x <<< 1) to in the kondo-lattice (x approximately 1) and formation of narrow resonance in proximity to the Fermi energy at x → 1, which determines the decrease of the effective magnetic moment of Ce ions (and Tsub(SG) decrease in x > or approximately 0.8 range) and appearance of superconductivity of heavy fermions in CeCu2Si2