Теоретическое исследование магнитных взаимодействий в диоксиде хрома

Abstract

We investigate behavior of the interatomic magnetic interactions in CrO2, starting from original and static variant of DMFT, based on the exact diagonalization of the effective Anderson impurity Hamiltonian, and Hartree-Fock approach. The contributions of double exchange, superexchange and higher order interactions, obtained from 1/A expansion (A being the intraatomic exchange splitting), were found to play an important role in stabilizing the ferromagnetic phase in CrO2.