TEMPERATURE-DEPENDENCE OF TRANSPORT-COEFFICIENTS IN LIQUID AND AMORPHOUS METALS

We apply the muffin-tin effective medium approximation to calculate th e temperature dependence of the resistivity and thermopower of amorpho us and liquid metals. The results show unambiguously that a large resi stivity is accompanied by a negative temperature coefficient, in agree ment with the experimental situation. This behavior is shown to result from a pseudo-gap which opens in the one-particle spectrum due to str ong scattering at the quasi zone boundary and which tends to close und er an increase in temperature. In turn the thermopower is found to hav e non-trivial density and temperature dependences.