Ac susceptibility behaviour of Ce₂Pd₁₋ₓCoₓSi₃

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We report the results of ac susceptibility chi measurements for various compositions of the series, Ce₂Pd₁₋ₓCoₓSi₃, in the polycrystalline form, which has been previously reported to undergo a transformation from magnetic ordering to non-magnetic Kondo lattice behavior as x is varied from 0 to 1. A finding of emphasis here is that the features in ac chi data for the compositions, x = 0.6 and 0.7, in the close vicinity of quantum critical point (QCP), are typical of long range magnetic ordering systems, whereas the compositions far away from QCP at the Pd-end including Ce₂PdSi₃ exhibit spin-glass characteristics. This trend is different from hitherto known behavior among Kondo alloys.