Magnetization plateaus and sublattice ordering in easy-axis kagome lattice antiferromagnets.

摘要: We study kagome lattice antiferromagnets where the effects of easy-axis single-ion anisotropy ($D$) dominates over Heisenberg exchange $J$. For $S\ensuremath{\ge}3/2$, virtual quantum fluctuations help lift extensive classical degeneracy. demonstrate presence a one-third magnetization plateau for broad range magnetic fields ${J}^{3}/{D}^{2}\ensuremath{\lesssim}B\ensuremath{\lesssim}JS$ along easy axis. The fully equilibrated system at low temperature on this develops an unusual nematic order that breaks sublattice rotation symmetry but not translation symmetry; however, extremely slow dynamics associated with ordering is expected to lead glassy freezing intermediate time scales.