  The model 2d kagome system (H3O)Fe3(SO4)2(OH)6 and the 3d pyrochlore Y2Mo2O7
are two well characterized examples of low-disordered frustrated
antiferromagnets which rather then condensing into spin liquid have been found
to undergo a freezing transition with spin glass-like properties. We explore
more deeply the comparison of their properties with those of spin glasses, by
the study of characteristic rejuvenation and memory effects in the
non-stationary susceptibility. While the pyrochlore shows clear evidence for
these non-trivial effects, implying temperature selective aging, that is
characteristic of a wide hierarchical distribution of equilibration processes,
the kagome system does n not show clearly these effects. Rather, it seems to
evolve towards the same final state independently of temperature.
