Ac susceptibility behaviour of Ce_2Pd_{1-x}Co_{x}Si_3

TL;DR

This study investigates ac susceptibility in Ce_2Pd_{1-x}Co_{x}Si_3, revealing magnetic ordering near the quantum critical point and spin-glass behavior away from it, challenging previous understanding of Kondo alloys.

Contribution

It provides new insights into magnetic behaviors across compositions in Ce_2Pd_{1-x}Co_{x}Si_3, especially near the quantum critical point.

Findings

Long-range magnetic order near QCP at x=0.6 and 0.7.

Spin-glass characteristics at compositions far from QCP.

Behavior differs from known Kondo alloy patterns.

Abstract

We report the results of ac susceptibility chi measurements for various compositions of the series, Ce_2Pd_{1-x}Co_xSi_3, 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 Ce_2PdSi_3 exhibit spin-glass characteristics. This trend is different from hitherto known behavior among Kondo alloys.