Spin dynamics in the spin glass phase of Y(Mn1-xAlx)2

Zero field μSR has been used to probe spin dynamics in the concentrated spin glass Y(Mn0.9Al0.1)2. The spectra follow a stretched exponential form, Gz(t)=exp(-(λt)β), with β reaching 1/3 as the freezing temperature, Tg=60K, is approached. The evolution of Gz(t) with temperature is suggestive of the behaviour of the spin correlation function found by Ogielski in Monte Carlo simulations of the dynamics of the Ising spin glass model. The μSR results are correlated with results previously obtained by inelastic neutron scattering. (orig.)