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Peculiarities of transport properties of three- and two-dimensionalhalf-metallic ferromagnets are investigated, which are connected with theabsence of spin-flip scattering processes. The temperature and magnetic fielddependences of resistivity in various regimes are calculated. The resistivityis proportional to T^{9/2} for T<T* and to T^{7/2} for T>T*, T* being thecrossover temperature for longitudinal scattering processes. The latter scaleplays also an important role in magnetoresistance. The contribution ofnon-quasiparticle (incoherent) states to the transport properties is discussed.It is shown that they can dominate in the temperature dependence of theimpurity-induced resistivity and in the tunnel junction conductivity.Comment: 6 pages, RevTeX, 2 figure

Temperature dependences of resistivity and magnetoresistivity for half-metallic ferromagnets