Abstract
Dynamic magnetic properties of the diluted Ising antiferromagnet, ${\mathrm{Fe}}_{0.25}{\mathrm{Zn}}_{0.75}{\mathrm{F}}_{2},$ have been investigated by dc-magnetic relaxation and ac-susceptibility measurements. In similarity with spin glasses, a strongly frequency-dependent cusp in the dynamic susceptibility appears at low temperature. The corresponding slowing down of the relaxation times is however found to follow an Arrhenius law, i.e., critical dynamics indicating a phase transition is not observed. Also, there are no indications of an equilibrium Almeida-Thouless line in the $H\ensuremath{-}T$ plane and the field dependence of the equilibrium susceptibility behaves noncritically. However, an ageing behavior, a common feature of frustrated disordered magnetic systems, is observed at low temperatures.
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