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In a previous paper (Paper I) we developed a technique for exactly solvingthe linearized Boltzmann equation for the electrical and thermal transportcoefficients in metals in the low-temperature limit. Here we adapt thistechnique to determine the magnon contribution to the electrical and thermalconductivities, and to the thermopower, in metallic ferromagnets. For theelectrical resistivity $\rho$ at asymptotically low temperatures we find $\rho\propto \exp{(-T_{\rm min}/T)}$, with $T_{\rm min}$ an energy scale thatresults from the exchange gap and a temperature independent prefactor of theexponential. The corresponding result for the heat conductivity is $\sigma_h\propto T^3\,\exp{(T_{\rm min}/T)}$, and thermopower is $S \propto T$. All ofthese results are exact, including the prefactors.

Exact solution of the Boltzmann equation for low-temperature transport coefficients in metals II: Scattering by ferromagnons