Incommensurate magnetic structure in an antiferromagnet with a strong exchange interaction between delocalized and localized electrons

The formation of an incommensurate three-dimensional magnetic order in an antiferromagnet is studied as a result of a strong correlation between holes and localized spins. The spectrum of spin polarons, the spin density wave, and the wave vector of the structure are calculated in the Kondo lattice model. The magnetic system is considered in the adiabatic approximation, the sublattice magnetization and spin-spin correlation functions are presented in the mean field approximation. The Fermi energy and s-d interaction energy are calculated. The heat capacity and heat capacity anomalies caused by spin polarons have been determined. Anomalies in the temperature dependence of conductivity and in optical conductivity in the low-energy region are founded.