Magnetic and magnetoimpurity charge-carrier scattering at the double exchange

Charge-carrier scattering in double-exchange ferromagnetic systems is calculated. First, the pure magnetic scattering is considered both in the spin-wave and paramagnetic regions. Then the magnetoimpurity scattering is treated when at finite temperatures microregions with enhanced magnetization arise close to ionized donors or accepters, and these static fluctuations of magnetization cause temperature-dependent carrier scattering. The latter mechanism is found to be much more powerful than the former, which confirms the concept that peculiar features of the colossal-magnetoresistance materials are determined by the magnetoimpurity scattering. [S0163-1829(98)05218-7].