Aging, rejuvenation, and memory effects in short-range Ising spin glass: Cu0.5Co0.5Cl2-FeCl3 graphite bi-intercalationcompound

Non-equilibrium aging dynamics in 3D Ising spin glass Cu0.5Co0.5Cl2-FeCl3 GBIC has been studied by zero-field cooled (ZFC) magnetization and low frequency AC magnetic susceptibility (f = 0.05 Hz), where Tg = 3.92± 0.11 K. The time dependence of the relaxation rate S(t) = (1/H)dMZF C/dln t for the ZFC magnetization after the ZFC aging protocol, shows a peak at a characteristic time tcr near a wait time tw (aging behavior), corresponding to a crossover from quasi equilibrium dynamics to non-equilibrium. The time tcr strongly depends on tw, temperature (T ), magnetic field (H), and the temperature shift (∆T ). The rejuvenation effect is observed in both χ′ and χ′′ under the T -shift and H-shift procedures. The memory of the specific spin configurations imprinted during the ZFC aging protocol can be recalled when the system is re-heated at a constant heating rate. The aging, rejuvenation, and memory effects observed in the present system are discussed in terms of the scaling concepts derived from numerical studies on 3D Edwards-Anderson spin glass model. PACS. 75.50.Lk Spin glasses and other random magnets – 75.10.Nr Spin-glass and other random models – 75.40.Gb Dynamic properties