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S. P. REPETSKY, A. G. NAKONECHYY, and B. V. STASHCHUK
«Theory of Spin-Dependent Transport in Systems with Strong Electron Correlations»
PACS numbers: 71.10.Fd, 71.20.Be, 71.27.+a, 72.10.Bg, 72.15.Qm, 72.25.Ba, 75.10.-b
An expression for two-particle Green’s function (electroconductivity) of magnetic crystals with strong electron correlations is obtained. The processes of electron scattering by fluctuations of spin and electron densities are taken into consideration. The electron states of the system are described within the scope of the multiband tight-binding model. Calculations are based on the diagram technique for temperature Green’s functions. Cluster expansion for two-particle Green’s function is obtained. The coherent potential approximation (CPA) is chosen as a zero-order one-site approximation for this expansion. As shown, the contributions from the processes of scattering by clusters decrease as the number of atoms in a cluster increases, and this decrease can be parameterized by a certain small parameter. Conditions for appearance of spin-dependent transport in systems with strong electron correlations are studied as applied to the iron single crystal as an example.