Electron spectrum, thermodynamics, and transport in antiferromagnetic metals at low temperatures

Electron spectrum of two-dimensional (2D) and 3D antiferromagnetic metals i s calculated with an account of spin-fluctuation corrections within perturb ation theory in the s-f exchange model. Effects of the interaction of condu ction electrons with spin waves in thermodynamic and transport properties a re investigated. At lowest temperatures T<T*similar to(Delta/E-F)T-N (Delta is the AFM splitting of the electron spectrum) a Fermi-liquid behavior tak es place, and nonanalytic T(3)ln T contributions to specific heat are prese nt for D = 3. At the same time, for T>T*, in 2D and "nested" 3D systems the picture corresponds to a marginal Fermi liquid (T In T contributions to sp ecific heat and nearly T-linear dependence of resistivity). Frustrations in the spin system in the 3D case are demonstrated to lead to similar results . The Kondo contributions to electronic properties are analyzed and demonst rated to be strongly suppressed. The incoherent contributions to transport properties in the presence of impurity scattering are considered. In partic ular, in the 2D case T-linear terms in resistivity are present up to T=0, a nd thermoelectric power demonstrates the anomalous T In T dependence.