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We have studied the temperature dependence of diagonal conductivity inhigh-mobility two-dimensional samples at filling factors $\nu=1/2$ and 3/2 atlow temperatures. We observe a logarithmic dependence on temperature, from ourlowest temperature of 13 mK up to 400 mK. We attribute the logarithmiccorrection to the effects of interaction between composite fermions, analogousto the Altshuler-Aronov type correction for electrons at zero magnetic field.  The paper is accepted for publication in Physical Review B, RapidCommunications.Comment: uses revtex macro

Logarithmic temperature dependence of conductivity at half-integer filling factors: Evidence for interaction between composite fermions