Time scaling of the ageing process in spin-glasses : a study in CsNiFeF 6

Abstract
The ageing properties of the time decay of the thermoremanent magnetization (TRM) in CsNiFeF6 are analysed on the basis of a phenomenological theory of time scaling as yet used in the case of the mechanical properties of glassy polymers. We find that the time decay law takes the form of the product of a stretched exponential by a power law