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We present results on the transport properties of the half-metallic ferromagnetic Heusler alloys Co 2 CrAl and Co 2 CrGa in the temperature range from 4 to 900 K. The peculiarities of the resistivity and the absolute differential thermoelectric power are considered within a two-current model of conductivity, taking into account the energy gap at the Fermi level in the electronic spectrum...