We report neutron depolarization measurements of the suppression of long-range ferromagnetism and the concomitant emergence of magnetic irreversibilities and spin freezing in ${\mathrm{CePd}}_{1-x}{\mathrm{Rh}}_x$ around $x^{*}\approx 0.6$. Tracking the temperature versus field history of the neutron depolarization, we find clear signatures of long-range Ising ferromagnetism below a Curie temperature $T_{\mathrm{C}}$ for $x=0.4$ and a spin freezing of ferromagnetic clusters below a freezing temperature $T_{\mathrm{F}1}$ for $x>x^{*}$. Under zero-field-cooling/field-heating and for $x>x^{*}$ a reentrant temperature dependence of the neutron depolarization between $T_{\mathrm{F}2}<T_{\mathrm{F}1}$ and $T_{\mathrm{F}1}$ is microscopically consistent with a thermally activated growth of the cluster size. The evolution of the depolarization as well as the reentrant temperature dependence as a function of Rh content are consistent with the formation of a Kondo cluster glass below $T_{\mathrm{F}1}$ adjacent to a ferromagnetic quantum phase transition at $x^{*}$.

• Received 22 May 2022
• Accepted 21 September 2022

DOI:https://doi.org/10.1103/PhysRevResearch.4.043029

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Published by the American Physical Society