Comparison of high-field Mossbauer and mu SR investigations on spin glasses

We report on the analysis of mu SR and Mossbauer measurements of the metallic spin glasses Y(Fe0.65Al0.35)(2) and Y(Fe0.4Al0.6)(2) above the freezing temperature (T-f) in terms of a model taking into account a dynamical process of stochastic formation and decay of magnetically correlated regions. By this model a comparison of the autocorrelation function determined by the two different measuring techniques is possible. For the temperature dependence of the autocorrelation time we find fair agreement between both experiments for T > 2T(f). (C) 2001 Elsevier Science B.V. All rights reserved.