DYNAMIC MEASUREMENTS IN A HEISENBERG SPIN-GLASS - CUMN

We have made extensive high field thermoremanent magnetization decay m easurements on Cu:Mn(6%), in magnetic fields between 5 and 6 kG, over a wide range of temperatures and for three different waiting times to examine spin glass dynamics in the previously unexplored Heisenberg re gime. We have found aging effects for both transverse and longitudinal freezing, with crossover behavior between the two regimes. This provi des the first dynamical experimental evidence consistent with the Heis enberg spin glass H-T phase diagram derived by Gabay and Toulouse.