  We study temperature dependence of diagonal conductivity at half filled
Landau level by means of the theory of composite fermions in the weakly
disordered regime $(k_{F}l>>1)$. At low temperatures we find the leading $\log
T$ correction resulting from interference between impurity scattering and gauge
interactions of composite fermions. The prefactor appears to be strongly
enhanced as compared to the standard Altshuler-Aronov term in agreement with
recent experimental observations.
