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 (kFl>> 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. 1 Since 1990 a number of strong experimental evidencies of an existence of compressible metal-like states of two-dimensional (2D) electrons in a strong magnetic field at even denominator fractions was obtained . Remarkably, the results of these experiments can be interpreted in terms of a simple semiclassical picture of spinless fermionic excitations forming a Fermi surface at kF = (4πne) 1/2 and experiencing only the difference magnetic field ∆B = B − 4πqne in the vicinity of ν = 1. The appropriate theoretical framework 2
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