  SU(3) heavy quark potentials at finite temperature are studied with quenched
lattice QCD using the stochastic gauge-fixing method. In addition to the
standard color average channel, we investigate $q\bar{q}$ potentials in singlet
and octet channels. % We obtain clear signals in all cases. The singlet
$q\bar{q}$ channel yields an attractive force, while the octet $q\bar{q}$
potential is repulsive; the corresponding color average channel also results in
an attractive force. %As the temperature increases, these forces are weakened
and As the temperature increases, these forces become weak and their variations
are very small; at $T/T_c=1.8-5.6$, % the singlet attractive force is not so
weakened even for long distances. the singlet attractive force survives over $R
\sim 1/T$. The singlet and octet potentials calculated with this algorithm have
a small gauge dependence when the gauge parameter $\alpha$ is changed from 0.6
to 1.3.
