Fermi-liquid and non-Fermi-liquid behavior in metallic antiferromagnets

The perturbation theory in terms of the s-f exchange model is used to analyze the problem of a non-Fermi-liquid behavior in two-dimensional (2D) and three-dimensional (3D) antiferromagnetic (AFM) metals. The effects of interaction of conduction electrons with spin waves on the electron spectrum, thermodynamic properties, and transport properties are considered. At very low temperatures T < T* similar to (Delta/E-F)T-N, where Delta is the AFM splitting of the electron spectrum, a Fermi-liquid behavior is observed; in the 3D case, there are nonanalytic corrections to heat capacity of an order of T(3)lnT. At T> T*, in the 2D case and in 3D systems in which "nesting" in the electron spectrum is observed (or anomalies in the magnon spectrum are present), the physical picture corresponds to the marginal Fermi liquid (of which the contributions of the TlnT type to the heat capacity and almost linear temperature dependence of the resistivity are typical). Contributions to the resistivity and thermoelectric power due to the interference of spin-wave and impurity-related scattering are discussed.