Specific-heat measurements on amorphous Feₓ{Zr}_{100{{-}}x}$ (x=90 and 92) by a thermal relaxation method reveal a temperature decay of the form T(t)=${T}₀+ΔT exp[-(t/τ{)}^{{{β}}}] below 20 K, where the alloys are asperomagnetically ordered. β0.5 when{T}₀${→}0. The stretched exponential is a manifestation of nonergodic behavior, because of the inability of the spin system to explore the available random magnetic configurations on the 100-ms times scale of the experiment.
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Coey et al. (1987) studied this question.
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