Abstract
We have performed a series of magnetic aging experiments on single crystals ofDy0.5Sr0.5MnO3. The results demonstrate striking memory and chaos-like effects in this insulating half-dopedperovskite manganite and suggest the existence of strong magnetic relaxation mechanismsof a clustered magnetic state. The spin-glass-like state established below a temperatureTsg≈ 34 K originates from quenched disorder arising due to the ionic-radii mismatch at the rareearth site. However, deviations from the typical behavior seen in canonical spin glassmaterials are observed which indicate that the glassy magnetic properties are due tocooperative and frustrated dynamics in a heterogeneous or clustered magnetic state. Inparticular, the microscopic spin flip time obtained from dynamical scaling near the spinglass freezing temperature is four orders of magnitude larger than microscopictimes found in atomic spin glasses. The magnetic viscosity deduced from the timedependence of the zero-field-cooled magnetization exhibits a peak at a temperatureT < Tsg and displays a marked dependence on waiting time in zero field.
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