  We have studied a Hubbard ring with alternating site potentials for half
filling in presence of a magnetic flux. Using a mean field approach we have
calculated the conductivity of such a ring at low and high temperatures. The
interplay of correlation, the polarizing field and the chemical modulation in
the site potentials tune the conductivity in an interesting fashion. In
presence of the modulation in the site energy an appreciable variation in the
conductance is observed with the change in flux. Finite size effects are also
identified and they are found to be quickly disappearing with increasing system
size. Sharp changes in the magnetoconductance is found to disappear at higher
temperatures.
