AC susceptibility behaviour of Ce₂Pd_1-xCo_xSi₃

Abstract

We report the results of ac susceptibility (\chi ) measurements for various compositions of the series, Ce₂Pd_1-xCo_xSi₃, in the polycrystalline form, which has been previously reported to undergo a transformation from magnetic ordering to non-magnetic Kondo lattice behaviour 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 behaviour among Kondo alloys.