  We consider the finite temperature effective potential of the standard model
at the one-loop level in four dimensions by taking account of two kinds of
order parameters, the Higgs vacuum expectation value and the zero modes of
gauge fields for the Euclidean time direction. We study the vacuum structure of
the model, focusing on the existence of new phase, where the zero modes, that
is, the new order parameters develop nontrivial vacuum expectation values
except for the center of the gauge group. We find that under certain conditions
there appears no new phase at finite temperature.
