Influence of quantum fluctuations on the magnetic properties of quasi-one-dimensional triangular antiferromagnets

A review is presented of the experimental work on the influence of quantum fluctuations on the magnetization and the mean spin of magnetic sublattices in quasi-one-dimensional triangular antiferromagnets. The principal results in this area are the strong magnetic-field dependence of magnetic sublattice mean spins; anisotropy of mean spin values in magnetically nonequivalent antiferromagnetic chains; the reduction of magnetization compared to the classical spin case; the nonlinear growth of the parallel magnetic susceptibility; a residual magnetization anisotropy at high fields. The results obtained are explained based on the spin-wave theory of quantum fluctuations in antiferromagnets. A new magnetic phase was observed in CsMnI₃ for H [IMG align=ABSMIDDLE alt=$\|$]vvert[/IMG] C₆ and shown to be due to the anisotropy of the mean spins of the sublattices.