Abstract
Aging is observed in the two-dimensional short-range Ising spin glass Rb2Cu0.78Co0.22F4 (Tc = 0 K) by means of low-frequency ac susceptibility and zero-field-cooled (ZFC) magnetization measurements. Below the freezing temperature (∼3.5 K), slow logarithmic relaxations are found in both the in-phase and out-of-phase ac susceptibility, and a waiting time dependence is observed in the relaxation of the zero-field-cooled magnetization. No saturation of the relaxations was found. The results suggest that the aging is governed by activated dynamics at length scales smaller than the equilibrium spin-glass correlation length.
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