  Violation of the fluctuation-dissipation theorem (FDT) in a frustrated
Heisenberg model on the Kagome lattice is investigated using Monte Carlo
simulations. The model exhibits glassy behaviour at low temperatures
accompanied by very slow dynamics. Both the spin-spin autocorrelation function
and the response to an external magnetic field are studied. Clear evidence of a
constant value of the fluctuation dissipation ratio and long range memory
effects are observed for the first time in this model. The breakdown of the FDT
in the glassy phase follows the predictions of the mean field theory for spin
glasses with one-step replica symmetry breaking.
