Phenomenologic study of phase transitions in noncollinear antiferromagnets of metallic perovskite type

Abstract

Abstract Magnetic phase diagrams of three-sublattice perovskite-type antiferromagnets in the H-T plane are constructed. The behaviour of the magnetic susceptibility at the phase transition point is analyzed theoretically. The influence of the external field on the spectrum of spin waves is investigated in the vicinity of critical points. Phenomenological energy constants are evaluated from the experimental temperature dependence of magnetization.