  $Q\bar{Q}$ potential is studied in the SU(2) gauge theory. Based on the
nonlinear gauge of the Curci-Ferrari type, the possibility of a gluon
condensation $\langle A_{\mu}^+A_{\mu}^-\rangle$ in low-energy region has been
considered at the one-loop level. Instead of the magnetic monopole
condensation, this condensation makes classical gluons massive, and can yield a
linear potential. We show this potential consists of the Coulomb plus linear
part and an additional part. Comparing with the Cornell potential, we study
this confining potential in detail, and find that the potential has two
implicit scales $r_c$ and $\tilde{R}_0$. The meanings of these scales are
clarified. We also show that the Cornell potential that fits well to this
confining potential is obtained by taking these scales into account.
