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We apply a recent quasiparticle model for the electronic properties ofmetallic helimagnets to calculate the transport properties of three-dimensionalsystems in the helically ordered phase. We focus on the ballistic regime tau^2T epsilon_F >> 1 at weak disorder (large elastic mean-free time tau) orintermediate temperature. In this regime, we find a leading temperaturedependence of the electrical conductivity proportional to T. This is muchstronger than either the Fermi-liquid contribution (T^2) or the contributionfrom helimagnon scattering in the clean limit (T^{5/2}). It is reminiscent ofthe behavior of non-magnetic two-dimensional metals, but the sign of the effectis opposite to that in the non-magnetic case. Experimental consequences of thisresult are discussed.

Theory of Helimagnons in Itinerant Quantum Systems IV: Transport in the Weak-Disorder Regime