  Motivated by the observation of a spin-glass transition in almost
disorder-free Kagome antiferromagnets, and by the specific form of the
effective low-energy model of the S=1/2, trimerized Kagome antiferromagnet, we
investigate the possibility to obtain a spin-glass behavior in two-component,
disorder-free models. We concentrate on a toy-model, a modified Ashkin-Teller
model in a magnetic field that couples only to one species of spins, for which
we prove that a dynamic spin-glass behavior occurs. The dynamics of the
magnetization is closely related to that of the underlying Ising model in zero
field in which spins and pseudo-spins are intimately coupled. The spin-glass
like history dependence of the magnetization is a consequence of the ageing of
the underlying Ising model.
