  We consider spin transport in a two-component atomic Bose gas in three
dimensions, at temperatures just above the critical temperature for
Bose-Einstein condensation. In these systems the spin conductivity is
determined by spin drag, i.e., frictional drag between the two spin components
due to interactions. We find that in the critical region the temperature
dependence of the spin conductivity deviates qualitatively from the Boltzmann
result and is fully determined by the critical exponents of the phase
transition. We discuss the size of the critical region where these results may
be observed experimentally.
